阅读说明：本技术 一种高导热圆管散热件及其制作方法 (High-heat-conductivity circular tube heat dissipation member and manufacturing method thereof ) 是由 叶崇 刘玲 黄东 曾超 廖超前 伍孝 余洋 吴晃 叶高明 张岳峰 刘金水 于 2020-05-28 设计创作，主要内容包括：本发明属于散热件技术领域,本发明提供了一种高导热圆管散热件的制作方法,包含如下步骤：以若干单向预浸料为原料制备圆环；将所述圆环沿轴线方向胶接成圆管；在所述圆管上制备通孔,得到带通孔圆管；在所述带通孔圆管的通孔处胶接铜销,即得高导热圆管散热件。本发明还提供了上述方法得到的高导热圆管散热件。本发明制备的高导热圆管散热件,不仅质量轻、高强高模、耐腐蚀,还具有沿径向的高导热特性,能充分发挥纤维的导热作用,同时,在轴向方向保持热流通过,能够有效地疏导热源产生的热量,防止热量集聚,提高圆管散热件的使用寿命。本发明的制作方法简单,适于批量生产,适合高温、高腐蚀、轻质、高强度的工作环境。(The invention belongs to the technical field of heat dissipation parts, and provides a manufacturing method of a high-heat-conductivity circular tube heat dissipation part, which comprises the following steps: preparing a circular ring by using a plurality of unidirectional prepregs as raw materials; gluing the circular rings along the axis direction to form circular pipes; preparing a through hole on the circular tube to obtain a circular tube with the through hole; and gluing a copper pin at the through hole of the circular tube with the through hole to obtain the high-heat-conductivity circular tube heat sink. The invention also provides the high-heat-conductivity circular tube heat sink obtained by the method. The high-heat-conductivity circular tube heat sink prepared by the invention has the advantages of light weight, high strength, high modulus, corrosion resistance, high heat conductivity along the radial direction, full play of the heat conduction effect of fibers, heat flow passing along the axial direction, effective heat dissipation generated by a heat source, heat accumulation prevention and prolonged service life. The manufacturing method is simple, suitable for batch production and suitable for high-temperature, high-corrosion, light and high-strength working environments.)

1. A method for manufacturing a circular tube heat sink with high thermal conductivity is characterized by comprising the following steps:

1) preparing a circular ring by using a plurality of unidirectional prepregs as raw materials;

2) gluing the circular rings along the axis direction to form circular pipes;

3) preparing a through hole on the circular tube to obtain a circular tube with the through hole;

4) and gluing a copper pin at the through hole of the circular tube with the through hole to obtain the high-heat-conductivity circular tube heat sink.

2. The manufacturing method of claim 1, wherein the unidirectional prepreg comprises mesophase high thermal conductivity pitch-based carbon fibers and a resin matrix, and the mass content of the resin matrix in the unidirectional prepreg is 20-40%.

3. The method according to claim 2, wherein the resin matrix is a thermosetting resin or a thermoplastic resin, the thermosetting resin is an epoxy resin, a bismaleimide resin, a cyanate resin, a benzoxazine resin or a thermosetting polyimide resin, and the thermoplastic resin is a polypropylene, a polyamide, a polycarbonate, a polyether ketone, a polyether ether ketone or a thermoplastic polyimide resin.

4. The method according to claim 3, wherein the mesophase high thermal conductivity pitch-based carbon fiber has a thermal conductivity of 600 to 800W/m-K and a tow of 1 to 6K.

5. The manufacturing method according to any one of claims 1 to 4, wherein in the step 1), 12 to 30 unidirectional prepregs are enclosed into a ring shape, and then hot-pressed to form the ring, wherein the height of the ring is 1 to 20 mm.

6. The manufacturing method of claim 5, wherein the adhesive bonding agent in step 2) is a heat conductive adhesive.

7. The method of claim 6, wherein the diameter of the through hole in step 3) is less than the thickness of the circular tube.

8. The manufacturing method of claim 7, wherein in the step 3), the number of the through holes is 8-25, and the axes of the through holes are parallel to the axis of the circular tube.

9. The method of claim 8, wherein the copper pin has a thermal conductivity of 350W/m-K or more.

10. The circular high thermal conductive tube heat sink obtained by the method for manufacturing a circular high thermal conductive tube heat sink according to any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of heat dissipation parts, in particular to a high-heat-conductivity circular tube heat dissipation part and a manufacturing method thereof.

Background

The high-thermal-conductivity asphalt-based carbon fiber resin-based composite material is a novel material, the thermal conductivity in a specific direction even reaches 500W/m.K, and exceeds that of common steel and aluminum alloy materials, and the high-thermal-conductivity asphalt-based carbon fiber resin-based composite material also has excellent properties of low density, high rigidity, high strength, corrosion resistance, wear resistance, damping resistance and the like of the composite material, and has wider property designability (thermal conductivity, modulus, strength and the like) aiming at different product structure forms, and the high-thermal-conductivity asphalt-based carbon fiber composite material has gradually developed into an indispensable material in society in recent years.

In a high-temperature working environment, in order to keep the equipment running for a long time, the heat dissipation capacity of the equipment becomes an important factor influencing the service life of the equipment, and the traditional heat conduction material and the high-heat-conduction asphalt-based carbon fiber composite material are subjected to elbow braking due to the defects of large mass, non-corrosion resistance and the like under the same heat conduction capacity.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a typical structure of a high-thermal-conductivity composite material, in particular to a high-thermal-conductivity circular tube heat sink and a manufacturing method thereof. The high-heat-conductivity circular tube heat sink prepared by the invention has the advantages of light weight, high strength, high modulus, corrosion resistance, high heat conductivity along the radial direction, full play of the heat conduction effect of fibers, heat flow passing along the axial direction, effective heat dissipation generated by a heat source, heat accumulation prevention and prolonged service life. The manufacturing method is simple, suitable for batch production and suitable for high-temperature, high-corrosion, light and high-strength working environments.

In order to achieve the above object, the present invention provides the following technical solutions:

the invention provides a method for manufacturing a high-heat-conductivity circular tube heat sink, which comprises the following steps of:

1) preparing a circular ring by using a plurality of unidirectional prepregs as raw materials;

2) gluing the circular rings along the axis direction to form circular pipes;

3) preparing a through hole on the circular tube to obtain a circular tube with the through hole;

4) and gluing a copper pin at the through hole of the circular tube with the through hole to obtain the high-heat-conductivity circular tube heat sink.

Preferably, the unidirectional prepreg comprises mesophase high-thermal-conductivity asphalt-based carbon fibers and a resin matrix, and the mass content of the resin matrix in the unidirectional prepreg is 20-40%.

Preferably, the resin matrix is a thermosetting resin or a thermoplastic resin, the thermosetting resin is an epoxy resin, a bismaleimide resin, a cyanate ester resin, a benzoxazine resin or a thermosetting polyimide resin, and the thermoplastic resin is a polypropylene, a polyamide, a polycarbonate, a polyether ketone, a polyether ether ketone or a thermoplastic polyimide resin.

Preferably, the thermal conductivity of the mesophase high-thermal-conductivity asphalt-based carbon fiber is 600-800W/m.K, and the filament bundle is 1-6K.

Preferably, in the step 1), 12-30 unidirectional prepregs are encircled to form a ring shape, and then hot pressing is performed to form the ring, wherein the height of the ring is 1-20 mm.

Preferably, the adhesive bonding agent in the step 2) is a heat-conducting adhesive.

Preferably, the diameter of the through hole in the step 3) is less than the thickness of the circular tube.

Preferably, in the step 3), the number of the through holes is 8-25, and the axis of each through hole is parallel to that of the round pipe.

Preferably, the thermal conductivity of the copper pin is not less than 350W/m.K.

The invention also provides a high-heat-conductivity circular tube heat sink obtained by the manufacturing method of the high-heat-conductivity circular tube heat sink.

The beneficial effects of the invention include the following:

1) the round tube heat dissipation part prepared by the invention has good heat conduction performance, has high heat conduction characteristic along the radial direction, can fully play the heat conduction role of fibers, simultaneously keeps heat flow passing in the axial direction, quickly dredges heat generated by a heat source out of the core part, prevents heat accumulation, prolongs the service life of the round tube heat dissipation part, and meets the heat dissipation occasions with high heat conduction requirements.

2) The high-heat-conductivity circular tube heat dissipation element is light in weight, and the high-heat-conductivity circular tube heat dissipation element has the characteristics of high strength and high modulus due to the high-heat-conductivity asphalt-based carbon fiber of the intermediate phase; the resin matrix improves the corrosion resistance of the high-heat-conductivity circular tube heat sink.

3) The preparation method of the circular tube heat dissipation member is simple, is suitable for batch production, and is suitable for high-temperature, high-corrosion, light and high-strength working environments.

Drawings

Fig. 1 is a front view of a circular tube heat sink with high thermal conductivity, wherein 1 is a copper pin, and 2 is a unidirectional prepreg;

fig. 2 is a perspective view of a circular tube heat sink with high thermal conductivity, wherein 1 is a copper pin, 2 is a unidirectional prepreg, and 3 is a mesophase high thermal conductivity pitch-based carbon fiber.

Detailed Description

The invention provides a method for manufacturing a high-heat-conductivity circular tube heat sink, which comprises the following steps of:

1) preparing a circular ring by using a plurality of unidirectional prepregs as raw materials;

2) gluing the circular rings along the axis direction to form circular pipes;

3) preparing a through hole on the circular tube to obtain a circular tube with the through hole;

4) and gluing a copper pin at the through hole of the circular tube with the through hole to obtain the high-heat-conductivity circular tube heat sink.

The unidirectional prepreg preferably comprises mesophase high-thermal-conductivity asphalt-based carbon fibers and a resin matrix, and the mass content of the resin matrix in the unidirectional prepreg is preferably 20-40%, and more preferably 25-35%.

The resin matrix of the present invention is preferably a thermosetting resin, preferably an epoxy resin, a bismaleimide resin, a cyanate ester resin, a benzoxazine resin or a thermosetting polyimide resin, or a thermoplastic resin, preferably a polypropylene, a polyamide, a polycarbonate, a polyetherketone, a polyetheretherketone or a thermoplastic polyimide resin, and more preferably a medium-temperature epoxy resin.

The thermal conductivity of the mesophase high-thermal-conductivity asphalt-based carbon fiber is preferably 600-800W/m.K, and is further preferably 650-750W/m.K; the optimized filament bundle is 1-6K, and the further optimized filament bundle is 3-5K.

In the step 1), preferably 12-30 unidirectional prepregs are encircled to form a circular ring, more preferably 15-25 unidirectional prepregs, and even more preferably 18-20 unidirectional prepregs; the circular ring is preferably subjected to hot pressing to form a circular ring, and the hot pressing is preferably die pressing or autoclave molding; the height of the circular ring is preferably 1-20 mm, more preferably 2-18 mm, and even more preferably 5-15 mm.

The hot pressing of the invention preferably sets process parameters according to the specific resin brand of the resin matrix.

The direction of the carbon fibers in the unidirectional prepreg in the step 1) is preferably set to be a radial direction, namely a direction perpendicular to the axis of the ring; the splicing seam of the adjacent unidirectional prepregs is preferably less than or equal to 1mm, and is further preferably less than or equal to 0.8 mm; the splicing seams of the adjacent unidirectional prepregs are preferably staggered by 10-30 degrees, and are further preferably staggered by 15-25 degrees.

In the ring in the step 1), the volume fraction of the fibers is preferably 50-75%, more preferably 55-65%, and even more preferably 60%.

The cementing agent in the step 2) of the invention is preferably a heat-conducting adhesive, more preferably a heat-conducting epoxy adhesive, and the heat conductivity coefficient of the heat-conducting adhesive is more than or equal to 3W/m.K, more preferably more than or equal to 5W/m.K; and preferably cleaning residual glue after the gluing is finished.

The diameter of the through hole in the step 3) of the invention is preferably less than the thickness of the round tube.

In the step 3), the number of the through holes is preferably 8-25, more preferably 12-20, and even more preferably 15-18; the through holes are preferably uniformly distributed; the axis of the through hole is preferably parallel to the axis of the circular tube.

After the through hole is prepared in step 3) of the method, the residual resin matrix and the asphalt-based carbon fiber scraps are preferably ground, and the through hole is further preferably cleaned by using a solvent, so that the asphalt-based carbon fiber inside the through hole is exposed, wherein the solvent is preferably acetone.

The heat conductivity coefficient of the copper pin is preferably more than or equal to 350W/mK, and further preferably more than or equal to 400W/mK; the diameter of the copper pin is preferably the same as the diameter of the through hole.

The invention also provides a high-heat-conductivity circular tube heat sink obtained by the manufacturing method of the high-heat-conductivity circular tube heat sink.

The circular tube heat sink prepared by the invention has good heat conducting property and high heat conducting property along the radial direction, simultaneously keeps heat flow passing in the axial direction, can fully play the heat conducting role of fibers, quickly dredges the heat generated by a heat source out of the core part, prevents heat from gathering, prolongs the service life of the circular tube heat sink, and meets the heat dissipation occasions with high heat conducting requirements. The circular tube heat sink prepared by the invention also has the advantages of light weight, high strength, high modulus and corrosion resistance, and the preparation method of the circular tube heat sink is simple, suitable for batch production and suitable for high-temperature, high-corrosion, light and high-strength working environments.

The heat conductivity coefficient of the high-heat-conductivity circular tube heat dissipation piece can reach (428-468) W/m.K, and the heat conduction effect is stronger than that of pure copper 401W/m.K; light weight, density significantly lower than that of copper 8.96g/cm³And the density of aluminum is 2.7g/cm³(ii) a The intermediate phase high heat conduction asphalt-based carbon fiber enables the high heat conduction circular tube heat dissipation element to have the characteristics of high strength and high modulus; the resin matrix improves the corrosion resistance of the high-heat-conductivity circular tube heat sink.

The technical solutions provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.