阅读说明：本技术 包括热管和传热块的电子器件冷却装置的制造方法 (Method for manufacturing electronic device cooling apparatus including heat pipe and heat transfer block ) 是由 尹国领 于 2019-12-13 设计创作，主要内容包括：本发明的包括热管和传热块的电子器件冷却装置的制造方法的特征在于,包括：在使所述底座位于热管上的状态下通过压力机以使凹槽容纳热管的方式将所述底座按压于所述热管的第一步骤；使在所述压紧过程中发生的铜粉末落下的第二步骤；以使所述底座位于下部的方式对所述底座和热管的结合体进行再对齐的第三步骤；以及在使所述盖件位于所述结合体上的状态下通过压力机将所述盖件按压于所述结合体的第四步骤。(The method for manufacturing an electronic device cooling apparatus including a heat pipe and a heat transfer block of the present invention is characterized by comprising: a first step of pressing the base against the heat pipe by a press in a state where the base is positioned on the heat pipe in such a manner that the groove receives the heat pipe; a second step of dropping the copper powder occurring during the compaction; a third step of realigning the combination of the base and the heat pipe in such a manner that the base is positioned at the lower portion; and a fourth step of pressing the cover member to the joined body by a press machine in a state where the cover member is positioned on the joined body.)

1. A method of manufacturing an electronic component cooling apparatus having a cooling tower in which a plurality of heat dissipation plates are stacked at a predetermined interval in a height direction and a copper-based heat pipe extending in the height direction through one side of the heat dissipation plates, the heat pipe being housed in a base having a groove and a heat transfer block covered with a cover being positioned on an upper surface of an electronic component, the method comprising:

a first step of pressing the base against the heat pipe by a press in a state where the base is positioned on the heat pipe in such a manner that the groove receives the heat pipe;

a second step of dropping the copper powder generated during the pressing;

a third step of realigning the combination of the base and the heat pipe in such a manner that the base is positioned at the lower portion; and

a fourth step of pressing the cover member to the joined body by a press in a state where the cover member is positioned on the joined body.

2. The method of manufacturing an electronic device cooling apparatus according to claim 1,

the heat pipe has a longitudinal cut shape in a circular shape, and the groove has a longitudinal cut shape in a semiellipse in which a major axis longer than a radius of the heat pipe is formed in an invagination direction of the heat pipe, so that an air gap is formed between the heat pipe and the groove when the first step is pressed.

3. The method of manufacturing an electronic device cooling apparatus according to claim 2,

the longitudinal cutting shape of the groove is provided with:

a chamfer part formed by chamfering the leading-in side corner;

a semielliptical extension portion extending such that a major axis longer than a radius of the heat pipe is in a semielliptical shape formed in a recessed direction; and

a rounded protrusion protruding from a central portion of a bottom surface of the groove in a rounded manner in a direction toward the heat pipe.

4. The method of manufacturing an electronic device cooling apparatus according to claim 3,

the semi-elliptical extension has a plurality of ridges and valleys continuously formed in a region thereof along the invagination direction of the heat pipe.

5. The method of manufacturing an electronic device cooling apparatus according to claim 2,

a plurality of projections are formed convexly on the surface of the portion of the recess where the air gap is formed.

6. The method of manufacturing an electronic device cooling apparatus according to claim 5,

an adsorbent including a grain husk is coated on a surface of the groove on which the convex portion is formed.

7. The method of manufacturing an electronic device cooling apparatus according to claim 6,

the step of preparing the adsorbent comprises:

a carbonization step of heating the grain husk to 600 to 800 ℃ at a heating rate of 5 ℃/min under a nitrogen flow of 100mL/min and maintaining the temperature for 1 to 5 hours, and then cooling the grain husk at normal temperature to carbonize the grain husk;

dipping the carbonized grain outer skin in a sodium hydroxide solution, and then heating and stirring for 1 to 5 hours;

a heat drying step of immersing the grain husk in water, heating the immersed grain husk at 90 to 110 ℃, washing the grain husk with water for 1 to 5 times, and drying the grain husk;

a first material preparation step of mixing 1 to 20 wt% of the cereal husk subjected to the heat drying step, 50 to 80 wt% of potassium hydroxide, and 10 to 40 wt% of water with respect to the weight of the first material, heating and stirring at 50 to 70 ℃, and then drying at normal temperature to prepare a first material;

an activation treatment step of holding the first substance in a ceramic boat under a nitrogen flow, raising the temperature to 700 to 900 ℃ at a temperature rise rate of 10 ℃/min, maintaining the temperature for 2 to 5 hours, and then cooling the first substance at normal temperature to activate the first substance;

a second substance preparation step of immersing the first substance after the activation treatment in water and then heating at 80 to 100 ℃ to prepare a second substance; and

the second substance is filtered and washed with water 1 to 5 times and then dried at 90 to 120 ℃ for 12 to 30 hours to complete the adsorbent finishing step of the adsorbent.

8. The method of manufacturing an electronic device cooling apparatus according to claim 1,

the surface in contact with the heat pipe in the groove is coated with a thermally conductive coating agent including carbon.

9. The method of manufacturing an electronic device cooling apparatus according to claim 8,

the step of preparing the thermally conductive coating agent includes:

a mixed solution preparation step of mixing 0.1 to 10 wt% of a raw material, 0.1 to 10 wt% of a surfactant, and 80 to 99 wt% of water with respect to the weight of the entire mixed solution to prepare a mixed solution;

a supernatant obtaining step of subjecting the mixed solution to ultrasonic treatment for 10 to 60 minutes and then centrifuging for 5 to 30 minutes to obtain a supernatant; and

mixing the supernatant 10 to 40 wt% and water 60 to 90 wt% with respect to the entire weight of the thermally conductive coating agent to complete a thermally conductive coating agent completing step of the thermally conductive coating agent.

10. The method of manufacturing an electronic device cooling apparatus according to claim 9,

the step of preparing the starting material comprises:

a first solution preparation step of mixing 1 to 20% by weight of styrene, 0.1 to 10% by weight of sodium lauryl sulfate, and 75 to 95% by weight of water with respect to the entire first solution weight to prepare a first solution;

a foaming step of charging nitrogen gas into the first solution to form a foam;

a second solution preparation step of mixing 80 to 99 wt% of the first solution having the foam formed and 1 to 20 wt% of a potassium persulfate solution with respect to the entire second solution weight and then stirring at 60 to 90 ℃ for 12 to 40 hours to prepare a second solution;

a third solution preparation step of stirring the second solution 50 to 80 wt% and the silica solution 20 to 50 wt% for 1 to 30 minutes with respect to the entire third solution weight to prepare a third solution;

an intermediate preparation step of drying the third solution at 50 to 90 ℃ and then heating at 400 to 600 ℃ for 3 to 8 hours to prepare an intermediate;

an impregnation treatment step of mixing 50 to 90 wt% of divinylbenzene and 10 to 50 wt% of a reaction initiator with respect to the weight of the entire impregnation solution to prepare an impregnation solution, impregnating the impregnation solution with the intermediate product, and drying the intermediate product at 60 to 90 ℃;

a carbonized substance producing step of carbonizing the impregnated intermediate product at 800 to 1000 ℃ for 3 to 10 hours under an argon atmosphere to produce a carbonized substance; and

after washing the carbonized substance with a hydrogen fluoride solution and filtering to obtain a filtrate and washing the filtrate with distilled water, drying is performed at 50 to 80 ℃ to complete a raw material completion step of a raw material.

Technical Field

The present invention relates to a method for manufacturing an electronic device cooling apparatus including a heat pipe and a heat transfer block, and more particularly, to a method for manufacturing an electronic device cooling apparatus which solves a problem of a cooling tower structure having a heat pipe inserted into a heat transfer block in contact with an electronic device that heat dissipation efficiency is lowered due to sintering occurring when the heat transfer block and the heat pipe are coupled.

Background

In general, a semiconductor integrated circuit is a subminiature circuit in which a plurality of circuit elements such as a transistor, a diode, and various resistors and capacitors are inseparably combined on one substrate, and recently, the semiconductor integrated circuit is widely used not only for a computer and a terminal device but also for various electronic devices such as a control meter including a TV, an audio device, and an electronic communication device, and the semiconductor integrated circuit tends to be manufactured with high integration density.

Therefore, the density of electrical heat generated by various electronic devices such as computer CPUs has also increased greatly along with the circuit integration rate. As described above, when the amount of self-heating of various electronic devices increases, the temperature of semiconductors constituting an integrated circuit also increases, which becomes a factor causing degradation of system performance, failure of devices, or reduction in lifetime.

In order to cool heat generated by various electronic devices, a cooling method is generally used in which a heat radiation fan is provided at a position close to a heat radiation plate. However, the cooling efficiency is lowered only by the heat radiation function of the heat radiation plate, and there are problems such as noise and insufficient cooling space as the heat radiation fan is relatively large-sized. In order to solve such problems, a cooling technique using a heat pipe is recently applied to cooling of electronic devices.

For example, korean utility model registration No. 20-0284564 (title of the invention: heat absorption block and heat pipe assembly) relates to a cooling device provided with a heat pipe, that is, an electronic device cooling device that dissipates heat generated by a central processing device of a computer.

The above prior art proposes a heat absorption block and heat pipe assembly, characterized in that it comprises: a heat absorbing block having insertion holes formed through both ends thereof and having welding beads formed along the insertion holes on the adjacent surface of the insertion holes; and a heat pipe which is pressed and fixed by the pressurization/deformation of the welding bead while being inserted into the insertion hole of the heat absorbing block.

Fig. 1 is a perspective view showing a schematic structure of an electronic component cooling apparatus provided with a known heat pipe.

In general, electronic device cooling apparatuses provided with heat pipes are of various types and structures, and in order to facilitate an intuitive understanding in conjunction with the above-described prior art, an electronic device cooling apparatus formed as a cooling tower is shown in fig. 1.

The cooling tower type electronic device cooling apparatus of fig. 1 is formed to structurally include: a cooling tower 100 in which a plurality of heat dissipation plates 110 and 120 are stacked at a predetermined interval in the height direction; a heat pipe 140 extending in the height direction through one side of the heat dissipation plates 110 and 120; and a heat transfer block 150 in which electronic components are arranged on a bottom surface in a state of accommodating the heat pipe 140.

That is, the heat transfer block 150 provides a function of transferring heat, which is secondarily absorbed after primarily absorbing heat of the electronic device, to the heat pipe 140, and finally dissipating the heat by the heat dissipation plates 110, 120 of the cooling tower 100 connected to the heat pipe 140.

According to such a structure (including the above-described prior art), the heat pipe 140 fulfills the roles of a medium body that transfers the heat of the heat transfer block 150 to the cooling tower 100 and a frame that supports the cooling tower 100, and particularly, in terms of a coupling structure with the heat transfer block 150, it is common to provide a manner of coupling by forming a groove in the heat transfer block 150 and inserting the heat pipe 140 in the groove.

In this case, the heat transfer block 150 is composed of a first plate positioned below the heat pipe 140 and a second plate positioned above the heat pipe with reference to the heat pipe 140, and grooves corresponding to a half shape (or other shapes) of the heat pipe 140 are formed in each plate, and a process of covering the second plate after the heat pipe 140 is coupled to the first plate is performed, and in this case, the heat pipe 140 is formed in a cylindrical structure, and thus, the plate-shaped first plate is moved in the direction of the heat pipe 140 to be pressed while fixing the heat pipe 140.

Specifically, according to the known process, the manner in which the first plate is pressed in the direction of the heat pipe 140, that is, by moving the lower side to the upper side in a state in which the heat pipe 140 is located on the upper side and the first plate is located on the lower side is based. At this time, a phenomenon in which fine powder is generated in the heat pipe 140 generally occurs when the heat pipe 140 made of a copper material is pressed, specifically, thermally pressed against the first plate and the second plate.

However, according to the process as described above, the generated powder is trapped between the heat pipe 140 and the first plate and is sintered by heat provided when press-molding after or while pressing, so that, when the heat transfer block 150 and the heat pipe 140 are integrated, the original purpose of obtaining a heat dissipation effect by making the heat transfer block 1500 and the heat pipe 140 be formed of different materials to obtain a difference in conductivity is impaired, and there is a problem that the heat dissipation performance is lower than originally intended.

Therefore, it is necessary to solve such problems and develop a method for manufacturing an electronic device cooling apparatus capable of preventing a sintering phenomenon while stably separating heat pipe powder generated at the time of pressing, which provides a novel and improved combination relationship of a heat pipe and a heat transfer block.

Disclosure of Invention

Technical problem

The present invention has been made to overcome the above-mentioned problems, and it is a primary object of the present invention to provide a method of manufacturing an electronic device cooling apparatus including a process capable of fixing a heat pipe and a heat transfer block by a so-called reverse pressing method to prevent a heat dissipation function from being degraded due to a sintering phenomenon of powder generated when the heat pipe and the heat transfer block are combined.

Another objective of the present invention is to provide various structures of the groove of the heat pipe to effectively prevent the sintering phenomenon.

It is still another object of the present invention to prevent the problem of unnecessary flow of powder from occurring by coating an adsorbent on the surface of a groove to which a heat pipe is coupled.

It is a further object of the present invention to include the adsorbent with the cereal husk and to provide a unique process for this to enhance the adsorption performance.

Technical scheme

In order to achieve the above object, a method of manufacturing an electronic device cooling apparatus including a heat pipe and a heat transfer block according to the present invention includes: a first step of pressing the base against the heat pipe by a press in a state where the base is positioned on the heat pipe in such a manner that the groove receives the heat pipe; a second step of dropping the copper powder generated during the pressing; a third step of realigning the combination of the base and the heat pipe in such a manner that the base is positioned at the lower portion; and a fourth step of pressing the cover member to the joined body by a press machine in a state where the cover member is positioned on the joined body.

ADVANTAGEOUS EFFECTS OF INVENTION

The manufacturing method of the electronic device cooling device comprising the heat pipe and the heat transfer block has the following effects:

1) the sintering phenomenon caused by the powder residue of the heat pipe is minimized through a reverse pressing mode, so that the stable heat dissipation performance can be maintained;

2) through the various structures of the groove and the corresponding unique combination relationship with the heat pipe, the sintering phenomenon is more effectively prevented;

3) preventing unnecessary flow of the powder by an adsorbent capable of adsorbing the powder; and is

4) The adsorption performance can be enhanced by the special components of the adsorbent.

Drawings

Fig. 1 is a perspective view showing a schematic structure of an electronic component cooling apparatus provided with a known heat pipe.

Fig. 2 is a conceptual diagram illustrating a process of combining a heat pipe and a heat transfer block of the present invention.

Fig. 3 is a sectional view showing a modified embodiment of the groove.

Fig. 4 is a cross-sectional view showing a first additional embodiment of the groove of fig. 2.

Fig. 5 is a partially enlarged sectional view showing a second additional embodiment of the groove of fig. 2.

Detailed Description

Best mode for carrying out the invention

The preferred embodiments of the present invention are as follows. A method of manufacturing an electronic component cooling apparatus having a cooling tower in which a plurality of heat dissipation plates are stacked at a predetermined interval in a height direction and a copper-made heat pipe extending in the height direction through one side of the heat dissipation plates, the heat pipe being housed in a base having a groove and a heat transfer block covered with a cover being positioned on an upper surface of an electronic component, the method comprising: a first step of pressing the base against the heat pipe by a press in a state where the base is positioned on the heat pipe in such a manner that the groove accommodates the heat pipe; a second step of dropping the copper powder generated during the pressing; a third step of realigning the combination of the base and the heat pipe in such a manner that the base is positioned at the lower portion; and a fourth step of pressing the cover member to the joined body by a press machine in a state where the cover member is positioned on the joined body.

Modes for carrying out the invention

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The drawings are not necessarily to scale, and like reference numerals designate like elements in each of the drawings.

First, the cooling apparatus of the present invention is configured as the electronic component cooling apparatus shown in fig. 1, in other words, based on a configuration in which the heat pipe 140 is accommodated in the base 151 formed with the groove 200 and the heat transfer block 150 covered with the cover 152 is positioned on the upper surface of the electronic component in a state where the cooling tower 100 in which the plurality of heat dissipation plates 110 and 120 are stacked at a predetermined interval in the height direction and the heat pipe 140 extending in the height direction through one side of the heat dissipation plates 110 and 120 are provided.

Based on such a structure, the manufacturing method of the present invention, and particularly, the bonding process of the heat pipe 140 and the heat transfer block 150 will be described below.

Fig. 2 is a conceptual diagram illustrating a process of combining a heat pipe and a heat transfer block of the present invention.

Referring to fig. 2, it can be known that the method of manufacturing the electronic device cooling apparatus including the combined process of the heat pipe and the heat transfer block of the present invention is largely divided into four steps. The following detailed description is made step by step.

1. Pressing step of heat pipe adopting reverse pressing mode and base with groove

First, the heat pipe 140 is fixedly aligned to a rack or other work table in such a way that it does not move. In this case, the lower portion of the heat pipe (or other portion corresponding to the work condition) may be fixed by attaching a vise to the work table, and in order to ensure the efficiency of the work, the heat pipe 140 preferably has a structure before being coupled to the cooling tower 100 or a partial structure other than the structure coupled to the heat dissipation plates 110 and 120.

Meanwhile, the heat pipe 140 may be formed in a rod shape of various three-dimensional structures, and while ensuring a stable coupling relationship with the heat transfer block, it is suitably formed in a cylindrical shape, i.e., a longitudinal cut shape of a circle, as will be described later, to correspond to various three-dimensional shapes of the base. However, in the basic embodiment of the present invention, the heat pipe is not necessarily limited to the cylindrical shape. Meanwhile, the heat pipe 140 may be made of various heat conductive materials, but the following process will be described assuming that it is made of a copper material that is widely used in general.

Thereafter, the base 151 is aligned in such a manner that the groove 200 faces the heat pipe 140 at the upper side of the heat pipe 140.

The groove 200(groove) has a shape and an effect like an inwardly recessed groove that can accommodate the heat pipe 140, and the shape thereof may be various as long as a space that can accommodate the heat pipe 140 can be provided. However, it is more preferable to form a three-dimensional shape having a set curvature according to the shape of the heat pipe 140 such that the gap is minimized, so that the phenomenon that the gap occurs when the heat pipe 140 is inserted into the groove 200 is minimized.

At this time, the cover member 152 to be described later is formed as a flat plate, fulfilling the role of covering the groove 200 into which the heat pipe 140 is inserted without a separate groove. Alternatively, the groove 200 may have a volume smaller than the entire volume in which the heat pipe 140 is accommodated, and a portion of the heat pipe 140 may be exposed to the outside of the groove 200 and surrounded by an inwardly recessed groove formed in the cover member 152 to accommodate the exposed portion of the heat pipe 140.

In the structure to be described later, description will be made on the assumption that the cover member 152 is formed as a flat plate.

The press (pressing device) may support the base 151 on the heat pipe 140 and then move it downward, i.e., in the direction of the heat pipe 140, to insert a partial portion of the heat pipe 140 into the groove 200, and then press it at a prescribed pressure to flatten the exposed portion of the heat pipe 140 as if it were not accommodated in the groove 200, thereby performing bonding of the cover member 152 to be described later. In other words, the groove 200 does not necessarily have to have a volume capable of accommodating the entire volume of the heat pipe 140, and the remaining portion of the heat pipe 140 that cannot be accommodated in the groove 200 may be subjected to a pressing process by a press machine to be flattened. During such pressing, heat may be applied.

Unlike the conventional art in which the heat pipe 140 is inserted into the groove 200 in a state of being aligned such that the opening of the groove 200 is directed upward, a process of moving the base 151 positioned thereon in the direction of the heat pipe 140 in a state of fixing the heat pipe 140 such that the heat pipe 140 is inserted into and pressed against the groove 200 is provided in the present invention, which is named as reverse press in the present invention. In this process, the press machine does not have to be constituted by one press machine that presses downward from above, but two press machines may be provided so that a process of pressing the remaining portion (mainly the lower end portion) of the heat pipe 140 that is not accommodated in the concave groove 200 by moving the support frame supporting the heat pipe 140 upward for the flattening process of the heat pipe 140 as described above can be added.

That is, in the conventional method, the copper powder of the heat pipe 140 generated during the pressing process remains in the groove 200 and is sintered by heating, and thus there is a problem in that the heat dissipation effect is reduced, but in the present invention, the opening of the groove 200 is opened in the gravity direction, and thus the copper powder of the heat pipe 140 can be provided with a characteristic of being naturally dropped even when the copper powder is generated during the pressing.

2. A step of dropping powder of the heat pipe generated during the pressing process

According to the first step, the opening of the groove 200 is opened in the gravity direction so that the powder (copper powder) of the heat pipe 140 can freely fall, and the powder remaining around the bonded portion in the bonded body of the groove 200 and the heat pipe 140 (in the present invention, this is referred to as a "bonded body") may be subjected to a sweeping (sweeping) process, or the bonded body may be vibrated or left for 10 to 30 seconds so that the remaining powder can freely fall.

3. Realigning the combination of the base and the heat pipe

The combination of the base 151 and the heat pipe 140 is turned over by a robot arm or other means, i.e., the combination is realigned in such a manner that the base 151 is positioned at the lower portion and the heat pipe 140 is positioned at the upper portion, and is also fixed to the work table in such a manner that it is not moved.

In this case, the upper region of the joined body is in a state of being not joined to the base and exposing the heat pipe with the reference line as a reference. A cover member 152 to be described later is bonded to the exposed portion of the heat pipe 140.

4. Pressing the cover member to the joined body

The press presses the cover member 152 to the coupled body in a state where the cover member 152 is positioned on the coupled body, thereby completing the coupling process of the heat pipe 140 and the heat transfer block 150. In this process, a hot pressing process may be also accompanied, whereby the contact portion between the base 151 and the cover 152 may be stably coupled.

As described above, the cover member 152 is formed in a flat plate shape as a basic shape, and may be provided with a groove partially recessed depending on the shape and volume of the heat pipe and the groove.

The cover 152 may have the same area and thickness as the base, or may have different areas and thicknesses from each other. Meanwhile, it is possible to fixedly couple with a substrate mounted with an electronic device by inserting a fastener in fastening holes formed at both sides of the cover 152 after coupling with the base 151 in a state where the cover 152 has a wider area than the base 151. Further, it is apparent that the cover 152 and the base 151 may be similarly formed with fastening holes, respectively, so that the coupling relationship therebetween may be finally ended by the coupling of the fastening members.

Further, when the groove 200 and the heat pipe 140 are formed in a three-dimensional shape to generate a gap, a process of performing a soldering process with a known filler material (solder paste) capable of filling the gap without a sintering phenomenon may be provided before the cap bonding step.

Thus, it is possible to provide a characteristic that can solve the problem that the heat dissipation function is deteriorated due to powder sintering or powder remaining phenomenon in the process of bonding the heat pipe 140 to the heat transfer block 150 composed of two, that is, the base 151 and the cover 152.

Fig. 3 is a sectional view showing a modified embodiment of the groove.

As described above, the heat pipe 140 may be formed in various three-dimensional shapes, and in the embodiment shown in fig. 3, a structure in which the longitudinal cut shape of the heat pipe 140 is circular is proposed.

At this time, the slit shape of the groove 200 is not a semicircle but a semi-ellipse shape (or a shape in which a part of an ellipse is cut out instead of a complete semi-ellipse shape) extending in the invagination (height) direction than the major axis of the radius length of the heat pipe 140. According to such a structure, a space is left after the heat pipe 140 is coupled to the groove 200. Specifically, in the minor axis direction of the groove 200, the heat pipe 140 is tightly coupled, and in the major axis direction of the groove 200, a gap of a half-moon-like longitudinal cut shape may be generated between the lower end of the heat pipe 140 and the corresponding face of the groove 200.

This gap is not filled by strongly pressing the heat pipe 140 in the direction of the groove 200 at the time of pressing in the first step, but the pressure of the pressing can be adjusted in a maintained manner, and such a gap is referred to as an air gap 240 containing air in the present invention.

The air gap 240 forms an air space between the heat pipe 140 and the base 151, and serves to buffer and alleviate a sintering phenomenon caused by a small amount of copper powder remaining in the groove 200 or adhering to the surface of the groove 200 in a small amount during pressing.

Fig. 4 is a cross-sectional view showing a first additional embodiment of the groove of fig. 2.

The embodiment of fig. 4 includes an additional configuration in the embodiment of fig. 2, and as shown in fig. 2, it is disclosed that chamfered portions 210, a half-ellipse extension 220, and rounded convex portions 230 are further provided in a slit shape of a recess 200 formed in a half-ellipse shape (or, as described above, an ellipse is not necessarily a half-ellipse but may be a partially cut-away ellipse shape) whose major axis extends in the height direction.

Specifically, the chamfered portion 210 is a portion where chamfering (chamfer) processing is performed in a rounded manner on the lead-in (opening) side corner of the concave groove 200, and the semi-elliptical extension portion 220 is a portion where the concave groove 200 extends so as to have the above-described semi-elliptical shape. Here, the chamfered portion 210 may be considered as a portion where the opening side introduction portion of the groove 200 is subjected to a hole enlarging process to prevent unnecessary copper powder from being generated by being caught or colliding with the groove 200 introduction side corner when the heat pipe 140 enters the groove 200.

The semi-elliptical extension 220 is a part extending to a position adjacent to the center of the bottom surface of the groove 200 so as to have the above-described semi-elliptical shape (semi-elliptical shape with the major axis extending in the height direction), and further, a part protruding in a rounded manner in a direction toward the heat pipe 140 may be formed at the center of the bottom surface of the groove 200, which is referred to as a rounded protrusion 230.

Such rounded protrusion 230 fulfills the role of enabling the bottom surface of the groove and the lower end of the heat pipe to be in contact while preventing the above-described air gap 240 from being generated unnecessarily wide, so that a minimum space for the residual copper powder not to be welded or even sintered can be reserved, so that the function described in fig. 2 can be maintained.

Further, in a partial region of the semi-elliptical extension 220, for example, an upper portion on a substantially central portion side with respect to the height, a wrinkle 221 in which a plurality of ridges and valleys are continuously formed in the invagination (height) direction of the heat pipe 140 may be further formed.

Such wrinkles 221 provide a space that can partially receive powder remaining at two portions of the side of the heat pipe 140, thereby serving to prevent a phenomenon of sintering from occurring at the side portions of the heat pipe 140. At this time, in order to prevent the provision of the close coupling relationship between the heat pipe 140 and the base 151 from being hindered by an unnecessarily large height difference between the valleys and the ridges, it is preferable that the height difference between the valleys and the ridges be about 0.5 to 1.5 mm.

Fig. 5 is a partially enlarged sectional view showing a second additional embodiment of the groove of fig. 2.

The embodiment of fig. 5 also shows an additional arrangement of the recess 200 of fig. 2, in which a plurality of projections 250 are formed to protrude from the surface of the recess 200 at the location where the air gap 240 is formed.

The convex portions 250 are used to fill unnecessary spaces of air gaps when the rounded protrusion 230 is formed in a single size having a relatively large volume, in other words, it is considered that a plurality of spaces for stabilizing the copper powder in a size relatively smaller than the space generated by the rounded protrusion 230 while ensuring the contact relationship between the bottom surface of the groove 200 and the heat pipe 140 by the convex portions 2500 are formed at predetermined intervals.

Further, an adsorbent 260 including a grain outer skin is coated on the surface of the groove 200 where the convex part 250 is formed.

The adsorbent 260 serves to adsorb the copper powder to prevent the copper powder from flowing in the space between the projections 250 during the above-described process. In particular, the adsorbent 260 of the present invention has very excellent adsorption capacity and includes an eco-friendly grain husk, so that copper powder can be adsorbed through the pores formed in the grain husk.

The step of preparing the adsorbent 260 having such characteristics may specifically include a carbonization step, an impregnation stirring step, a heat drying step, a first substance preparation step, an activation treatment step, a second substance preparation step, and an adsorbent finishing step.

First, the carbonization step is a process of heating the grain husk to 600 to 800 ℃ at a heating rate of 5 ℃/min under a nitrogen flow of 100mL/min and maintaining for 1 to 5 hours, and then cooling at normal temperature to carbonize the grain husk.

Through this process, pores are formed on the surface of the grain husk, and silicon constituting the grain husk has a composition similar to fumed silica after firing treatment. The grain husk after carbonization is a porous sintered substance with fine pores, and has a particle size of 40,000-60,000 m²The larger specific surface area/kg, the very high activity, and therefore can adsorb a large amount of gas. In addition, the strength and durability of the adsorbent 260 prepared from the grain husk can be improved due to higher activity.

Thereafter, the dipping and stirring step is a process of dipping the carbonized grain husk in a sodium hydroxide (NaOH) solution and then heating and stirring for 1 to 5 hours.

In this case, the sodium hydroxide solution is a chemical for activating the carbonized grain husk, and here, the activation means that the adsorption performance is improved by further increasing the surface area of the porous substance. The activated grain husk can be obtained by increasing the sodium hydroxide solution deposited on the thus carbonized grain husk, and in this case, preferably, the sodium hydroxide solution may include 5 to 10mol of sodium hydroxide.

Next, pulling down, in the heat drying step, the deposited cereal husk is immersed in water, heated at 90 to 110 ℃, then washed 1 to 5 times with water and dried, fulfilling the function of removing residual sodium hydroxide by heat-treating the cereal husk immersed in water under the above-mentioned temperature conditions, and finally the cereal husk carbonized by evaporating water used in washing can be obtained by vacuum drying at 80 to 130 ℃ (preferably, 110 to 120 ℃).

Then, the first material preparation step is a process of mixing 1 to 20 wt% of the grain husk subjected to the heat drying step, 50 to 80 wt% of potassium hydroxide (KOH), and 10 to 40 wt% of water with respect to the weight of the first material, heating and stirring at 50 to 70 ℃, and then drying at normal temperature to prepare the first material.

In this case, carbonization means burning a certain substance. Such a carbonizable substance may be carbon, and in the present invention, since the rice chaff, which causes soil contamination, is carbonized, toxic gases generated in a semiconductor manufacturing process are adsorbed by the rice chaff, and when such an adsorbent is discarded, not only soil contamination is prevented, but also sulfur oxides and nitrogen oxides generated during carbonization are less than those generated during carbonization of other substances, and thus an effect of preventing air contamination can be further provided.

Next, the activation treatment step is a process of holding the first substance in a ceramic boat under a nitrogen flow, raising the temperature to 700 to 900 ℃ at a temperature raising rate of 10 ℃/min, and then maintaining for 2 to 5 hours, and then the first substance is subjected to activation treatment.

Since the ceramic boat has chemical resistance and wear resistance and is not affected by acids, alkalis, and organic solvents, it is preferable to impregnate the active material in a potassium hydroxide solution. Further, since the ceramic boat can be used at a temperature of 1600 ℃ or higher, the carbonized grain husk can be sufficiently impregnated in a potassium hydroxide solution to be activated even under high temperature conditions without damaging the ceramic boat.

Thereafter, in the second substance preparation step, the first substance after the activation treatment is immersed in water and then heated at 80 to 100 ℃ to prepare the second substance, this step fulfills the role of easily removing potassium hydroxide remaining in the first substance at a high temperature by heating the first substance after the activation treatment to 80 to 100 ℃.

Finally, in the adsorbent-finishing step, the second substance is filtered and washed with water 1 to 5 times and then dried at 90 to 120 ℃ for 12 to 30 hours to finish the adsorbent, which can be considered as a process for further widening the surface area of the grain husk by preparing the activated grain husk by drying after washing the second substance under the above-mentioned temperature conditions to maximize the adsorption function of the adsorbent.

By applying the thus prepared adsorbent 260 to the surface of the groove 200 in which the protrusions 250 are formed, an excellent adsorption function to the powder, i.e., the copper powder, can be performed, and thus, the sintering phenomenon of the powder can be more effectively prevented from occurring.

Further, a surface in contact with the heat pipe 140 in the groove of the base is coated with a heat conductive coating agent including carbon so as to efficiently transfer heat of the heat transfer block 150 to the heat pipe, and particularly, the heat conductive coating agent may include carbon which is one of substances having very high heat conductivity.

The step of preparing such a thermal conductive coating agent may include a mixed solution preparation step, a supernatant obtaining step, and a thermal conductive coating agent finishing step.

First, the mixed liquid preparation step is a process of mixing 0.1 to 10 wt% of the raw material, 0.1 to 10 wt% of the surfactant, and 80 to 99 wt% of water with respect to the entire mixed liquid weight to prepare a mixed liquid.

At this time, the raw material is a starting material for preparing a thermal conductive coating agent containing carbon as an effective component, and in order to make such a thermal conductive coating agent have high thermal conductivity, it is preferable that the raw material includes carbon. In particular, it is preferable that the raw material includes porous carbon having a large surface area as an active ingredient, and a detailed description of a method for producing such a raw material will be described later.

The surfactant added in the preparation of the mixed solution may be, specifically, sdbs (sodium docylcysteine sulfate), and such a surfactant provides a function of improving dispersibility in water by providing a phenomenon that raw materials containing carbon as an active ingredient (a phenomenon of agglomeration in water may occur due to hydrophobicity) are agglomerated with each other.

Thereafter, the supernatant obtaining step is a process of subjecting the mixed solution to ultrasonic treatment for 10 to 60 minutes, and then centrifuging for 5 to 30 minutes to obtain a supernatant.

At this time, the supernatant refers to a solution of the upper layer of the centrifuged final product of the mixed solution except for the substances sinking to the bottom, and such supernatant includes the raw materials, so that the thermally conductive coating agent can be prepared therefrom.

Finally, in the thermally conductive coating agent-completing step, 10 to 40% by weight of the supernatant liquid and 60 to 90% by weight of water are mixed with respect to the entire weight of the thermally conductive coating agent to complete the thermally conductive coating agent, at which time, as already mentioned, the raw material is included in the supernatant liquid, and by mixing such supernatant liquid with water, the concentration of the supernatant liquid can be diluted and used as the thermally conductive coating agent.

The step of preparing the raw material included in such a heat conductive coating agent may specifically include a first solution preparation step, a foam preparation step, a second solution preparation step, a third solution preparation step, an intermediate product preparation step, an impregnation treatment step, a carbonized substance generation step, and a raw material completion step.

First, the first solution preparation step is a process of mixing 1 to 20 wt% of styrene, 0.1 to 10 wt% of SDS (Sodium dodecyl sulfate), and 75 to 95 wt% of water with respect to the entire weight of the first solution to prepare the first solution.

In this case, styrene is an effective component of the first solution and can be considered as a starting material for preparing porous carbon. That is, porous carbon is prepared from carbon using styrene. In addition, SDS is a surfactant that provides a function of improving water dispersibility of styrene to enable good mixing of hydrophobic styrene and water.

Here, styrene and water can be better mixed by mixing styrene, water and SDS and then heating and stirring at a temperature of 50 to 70 ℃. In this case, when stirring at a temperature lower than 50 ℃, there is a possibility that sufficient mixing may not be achieved, and when stirring at a temperature higher than 70 ℃, SDS is supersaturated and SDS precipitates with cooling after preparation of the solution, so that heating and stirring under the above temperature conditions (50 to 70 ℃) are preferable.

After that, in the foaming step, nitrogen gas is put into the first solution to form a foam, which can be considered as a process of removing oxygen included in the first solution by bubbling treatment of the first solution to remove oxygen that suppresses a reaction of a step to be described later.

Next, the second solution preparation step is a process of mixing 80 to 99 wt% of the first solution formed with the foam and 1 to 20 wt% of a Potassium persulfate (Potassium persulfate) solution with respect to the entire second solution weight, and then stirring at 60 to 90 ℃ for 12 to 40 hours to prepare a second solution.

In this case, potassium persulfate is a polymerization initiator for initiating the polymerization reaction of the first solution, and the potassium persulfate solution is mixed with the first solution after the bubbling treatment to cause the polymerization reaction of styrene, which is an effective component of the first solution, thereby producing polystyrene. That is, the second solution may contain polystyrene as an active ingredient.

Here, when the amount of potassium sulfate solution added is less than 1 wt%, a sufficient polymerization reaction may not be performed, and when it exceeds 20 wt%, excessive potassium persulfate may be present in the second solution, thereby causing an obstacle in the production of porous carbon by a step to be described later.

Thereafter, the third solution preparation step is a process of stirring the second solution 50 to 80 wt% and the silica solution 20 to 50 wt% for 1 to 30 minutes with respect to the entire third solution weight to prepare a third solution.

At this time, the silica solution may be prepared by mixing 5 to 30% by weight of silica and 70 to 95% by weight of water with respect to the weight of the entire silica solution, and the silica solution thus prepared may have an emulsion shape. Silica, which is an effective component of such a silica solution, performs the same function as a template (template) for producing porous carbon, specifically, porous carbon is generated as carbon particles enter the positions where the silica particles originally exist, following a carbonization process to be described later, after the silica particles enter between polystyrenes (detailed description thereof will be described later).

Thus, the two solutions thus having the emulsion shape, i.e., the second solution and the silica solution, may be mixed to prepare a third solution.

Next, the intermediate preparation step is a process of drying the third solution at 50 to 90 ℃ and then heating at 400 to 600 ℃ for 3 to 8 hours to prepare an intermediate.

This process is a process of drying the third solution to remove water as a solvent of the third solution, and may be considered as a step of performing a carbonization process by heating at 400 to 600 ℃ after completion of the drying process, thereby removing polystyrene included in the third solution and preparing an intermediate product having carbon and silica as effective components.

Here, the carbonization process is a process of heat-treating the organic matter at a high temperature for a prescribed time to leave only carbon, and by heating the third solution for 3 to 8 hours (preferably 5 to 6 hours) so that the polystyrene included in the third solution can be sufficiently carbonized, an intermediate product in which the polystyrene is removed and only carbon and silica remain can be obtained.

Then, the impregnation treatment step is a process of mixing 50 to 90 wt% of divinylbenzene and 10 to 50 wt% of a reaction initiator with respect to the weight of the entire impregnation solution to prepare an impregnation solution, impregnating the impregnation solution with the intermediate product, and drying the impregnated intermediate product at 60 to 90 ℃.

In this case, divinylbenzene is an active ingredient of the impregnation solution, and provides a function of filling divinylbenzene particles into empty spaces of an intermediate product containing carbon as an active ingredient (a function of generating mesopores (mesopores) by carbonization in a step to be described later).

In addition, the reaction initiator initiates the polymerization of divinylbenzene, and may be 2,2 '-azobisisobutyronitrile (2,2' -azobisisobutyronitrile). The intermediate product is thus impregnated with an impregnating solution so that the polymerized divinylbenzene penetrates into the empty spaces between the silica particles.

Further, the drying process is a process for preventing the inhibition of the reaction by removing oxygen and residual air in the impregnation solution at the time of impregnating the intermediate product, and in this case, a freeze pump (freeze pump) method generally used for removing an organic solvent may be used as the drying process (since this method is a well-known conventional technique, detailed description thereof will be omitted).

Next, in a carbonized substance producing step, the impregnated intermediate product is carbonized at 800 to 1000 ℃ for 3 to 10 hours under an argon atmosphere to produce a carbonized substance, and polydivinylbenzene originally present between the silica particles is removed by carbonizing polydivinylbenzene included in the impregnated intermediate product to produce a carbonized substance.

In this case, the carbonized substance contains silica as an active ingredient in addition to carbon, and has a shape in which carbon is present in pores present between silica particles (i.e., pores generated by carbonizing polydivinylbenzene).

Finally, the raw material completion step is a process of washing the carbonized substance with a Hydrogen Fluoride (HF) solution, filtering to obtain a filtrate, washing the filtrate with distilled water, and drying at 50 to 80 ℃ to complete the raw material.

At this time, the hydrogen fluoride solution is used to remove silica (i.e., unreacted silica) remaining in the carbonized substance, and thus the carbonized substance is washed and then filtered to obtain a filtrate including the carbonized substance from which the silica has been removed. In this case, carbon is present in pores present between the silica particles (i.e., pores generated by carbonizing polydivinylbenzene) in the carbonized substance, and the silica of the carbonized substance is removed in this state to generate empty spaces, thereby forming porous carbon.

Further, the raw material containing porous carbon as an active ingredient can be efficiently completed by subjecting the filtrate to a process of washing with distilled water for removing the hydrogen fluoride solution remaining in the filtrate and a drying process for removing water used as a washing liquid.

As described so far, although the configuration and action of the manufacturing method of an electronic device cooling apparatus including a heat pipe and a heat transfer block of the present invention are described in the above description and the drawings, this is merely an exemplary description, the idea of the present invention is not limited to the above description and the drawings, and it is apparent that various changes and modifications can be made within a scope not departing from the technical idea of the present invention.

Industrial applicability of the invention

The present invention relates to a method for manufacturing an apparatus for cooling an electronic device, and it is apparent that such an electronic device and a cooling apparatus have industrial applicability since they are currently used in various industrial fields.