阅读说明：本技术 一种粉体材料的小批量烧结成型装置及其应用 (Small-batch sintering forming device for powder materials and application thereof ) 是由 郑兴华 蔡冬青 荆卫东 王玉琪 张欢 王其竞 于 2021-02-03 设计创作，主要内容包括：本发明公开了一种粉体材料的小批量烧结成型装置,包括支架(1)、压片组件(2)和控温组件(3)；所述支架(1)包括底座(11)、顶板(13)、以及一端固定在所述底座上、另一端与顶板连接的支撑杆(12)；所述压片组件(2)包括用于放置压片模具的平台(21)、设置于所述底座并与平台连接的压力调节件(25)、盖板(22)、与所述盖板连接、用于带动所述盖板向下运动以压紧压片模具的丝杆(23)和与所述丝杆连接的丝杆驱动件(24)；所述温控组件包括设置在所述平台上的加热罩(31)；本发明还公开了所述的粉体材料的小批量烧结成型装置的应用。本发明所述的装置可同时满足热压烧结和冷烧结工艺的使用要求,制得的样品的性能优异。(The invention discloses a small-batch sintering molding device for powder materials, which comprises a bracket (1), a tabletting component (2) and a temperature control component (3); the support (1) comprises a base (11), a top plate (13) and a support rod (12), wherein one end of the support rod is fixed on the base, and the other end of the support rod is connected with the top plate; the tabletting assembly (2) comprises a platform (21) for placing a tabletting mold, a pressure regulating part (25) arranged on the base and connected with the platform, a cover plate (22), a screw rod (23) connected with the cover plate and used for driving the cover plate to move downwards so as to compress the tabletting mold, and a screw rod driving part (24) connected with the screw rod; the temperature control assembly comprises a heating cover (31) arranged on the platform; the invention also discloses application of the small-batch sintering and forming device for the powder material. The device provided by the invention can simultaneously meet the use requirements of hot-pressing sintering and cold-sintering processes, and the prepared sample has excellent performance.)

1. The utility model provides a powder material's small batch sintering forming device which characterized in that: comprises a bracket (1), a tabletting component (2) and a temperature control component (3); the support (1) comprises a base (11), a top plate (13) and a support rod (12), wherein one end of the support rod is fixed on the base (11), and the other end of the support rod is connected with the top plate (13); the tabletting assembly (2) comprises a platform (21) for placing a tabletting mold, a pressure regulating part (25) arranged on the base (11) and connected with the platform (21), a cover plate (22), a screw rod (23) connected with the cover plate (22) and used for driving the cover plate (22) to move downwards so as to compress the tabletting mold, and a screw rod driving part (24) connected with the screw rod (23); the temperature control assembly comprises a heating cover (31) arranged on the platform (21), and the inner diameter of the heating cover (31) is the same as the diameter of the cover plate (22).

2. The small-batch sintering molding device for powder materials according to claim 1, characterized in that: the pressure regulating part (25) is a hydraulic regulator; the oil-gas separation device comprises an oil cylinder arranged in a platform (21), a pressure gauge (26) arranged on a base (11), a pressurizing rocker (251) arranged on the side surface of the base (11), an oil drain valve (252) arranged on the base (11) and an oil drain hole (253).

3. The small-batch sintering molding device for powder materials according to claim 1, characterized in that: the screw rod driving piece (24) comprises a rotary disc (241) connected with the screw rod (23) and a handle (242) arranged on the rotary disc (241).

4. The small-batch sintering molding device for powder materials according to claim 1, characterized in that: the top plate (13) is provided with a through hole (131) for the screw rod (23) to pass through, and the inner wall of the through hole (131) is provided with an internal thread matched with the screw rod (23).

5. The small-batch sintering molding device for powder materials according to claim 1, characterized in that: and a heat insulation pad (27) is also arranged between the heating cover (31) and the platform (21).

6. The small-batch sintering molding device for powder materials according to claim 1, characterized in that: the heating cover (31) is of an opening and closing structure, and the heating cover (31) comprises a first heating part (311) and a second heating part (312) which are hinged with each other and a closing locking part; when the heating cover (31) is closed, the top ends of the first heating part (311) and the second heating part (312) are jointly provided with a hole for the screw rod (23) to pass through; the heating device is characterized in that heating resistance wires are respectively arranged on the first heating part (311) and the second heating part (312), and insulating layers are arranged on the outer walls of the first heating part (311) and the second heating part (312).

7. The small-batch sintering molding device for powder materials according to claim 1, characterized in that: the supporting rod (12) is connected to the top plate (13) through a fastening nut, and the supporting rod (12) is connected with the bottom plate in an interference fit mode.

8. The small-batch sintering molding device for powder materials according to claim 1, characterized in that: the heating temperature of the heating cover is 25-1000 ℃, and the forming pressure of the tabletting component is 5-600 Mpa.

9. The small batch sintering molding device of powder material of claim 1, which is applied to sintering molding of metal-based or ceramic-based electronic functional materials and ceramic-polymer composite materials.

Technical Field

The invention relates to the technical field of material forming preparation, in particular to a small-batch sintering forming device for powder materials and application thereof.

Background

The powder tablet press is a common device used in the molding of powder materials such as metal-based, ceramic-based electronic functional materials, ceramic-polymer composite materials and the like. The sintering and forming method of the powder material comprises the traditional hot-pressing sintering and forming and the emerging cold-pressing sintering and forming. Hot Pressed Sintering (Hot Pressed Sintering) is a Sintering method in which dry powder is filled into a mold, and then heated while being pressurized from a uniaxial direction, so that molding and Sintering are simultaneously completed. The hot-press forming device has the defects of high price, high energy consumption and short service life of equipment. The Cold Sintering Process (CSP) can realize the Sintering and forming of the ceramic material under the action of external pressure at the temperature lower than 300 ℃, and the method saves energy and is a new material manufacturing method with higher commercial potential; however, few reports on cold-pressed sintering devices in the prior art are available. In addition, the prior art sintering and forming device has a single function, and cannot simultaneously satisfy the implementation of the two sintering methods.

Disclosure of Invention

The invention aims to solve the problems and provides a small-batch sintering and forming device for powder materials, which can simultaneously meet the pressure and temperature regulation requirements of hot-pressing sintering and cold-pressing sintering, has a simple structure, is convenient to operate and has excellent performance of the prepared materials.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a small-batch sintering molding device for powder materials comprises a bracket, a tabletting component and a temperature control component; the support comprises a base, a supporting rod and a supporting rod, wherein one end of the supporting rod is fixed on the base, and the other end of the supporting rod is connected with the top plate; the tabletting assembly comprises a platform for placing a tabletting mold, a pressure regulating part arranged in the base and connected with the platform, a cover plate, a screw rod connected with the cover plate and used for driving the cover plate to move downwards so as to compress the tabletting mold, and a screw rod driving part connected with the screw rod; the temperature control assembly comprises a heating cover, the bottom of the heating cover is arranged on the platform, and the inner diameter of the heating cover is the same as the diameter of the cover plate.

Preferably, the pressure regulating member is a hydraulic regulator; including set up in hydro-cylinder in the platform, set up in manometer on the base, set up in the pressurization rocker of base side with set up in fuel outlet valve and oil drain hole on the base.

Preferably, the screw rod driving piece comprises a rotating disc connected with the screw rod and a handle arranged on the rotating disc.

Preferably, a through hole for the screw rod to pass through is formed in the top plate, and an internal thread in threaded fit with the screw rod is formed in the inner wall of the through hole.

Preferably, a heat insulation pad is further arranged between the heating cover and the platform.

Preferably, the heating cover is of an opening and closing structure and comprises a first heating part, a second heating part and a closing locking part, wherein the first heating part and the second heating part are hinged with each other; when the heating cover is closed, the top ends of the first heating part and the second heating part form a hole for the screw rod to pass through; the first heating part and the second heating part are respectively provided with heating resistance wires, and the outer walls of the first heating part and the second heating part are both provided with heat preservation layers.

Preferably, the supporting rod is connected to the top plate through a fastening nut, and the supporting rod is connected with the bottom plate in an interference fit mode.

Preferably, the heating temperature of the heating cover is 25-1000 ℃, and the molding pressure of the tabletting component is 5-600 Mpa.

The invention also aims to provide application of the powder material small-batch sintering forming device

The small-batch sintering and forming device for the powder material is applied to sintering and forming of metal-based or ceramic-based electronic functional materials and ceramic-polymer composite materials.

The invention has the following beneficial effects:

1. the invention discloses a small-batch sintering forming device for powder materials, which comprises a tabletting component and a temperature control component, wherein the heating temperature of the device is 25-1000 ℃, the forming pressure is 5-600 Mpa, the adjustable range of pressure and temperature is large, the use requirements of hot-pressing sintering and cold-sintering processes can be met simultaneously, and the use range is wide.

2. The small-batch sintering forming device for the powder materials is simple in structure and easy and convenient to operate, and the heating cover in the temperature control assembly is of an opening and closing structure, so that convenience is provided for installation of a tabletting mold; the heating cover is detachable, so that the operating environment can be quickly cooled, the forming time of materials is shortened, and the production efficiency is improved.

3. The small-batch sintering and forming device for the powder material is applied to sintering and forming of metal-based and ceramic-based electronic functional materials and ceramic-polymer composite materials, and the prepared material is controllable in grain size and excellent in performance.

Drawings

FIG. 1 is a schematic structural diagram of a small-batch sintering and molding device for powder materials;

FIG. 2 is a schematic view of a heating mantle;

FIG. 3 is a schematic view of the top plate;

wherein, 1 is a bracket, 11 is a base, 12 is a support rod, 13 is a top plate, and 131 is a through hole; 2, a pressing component, 21, a platform, 22, a cover plate, 23, a screw rod, 24, a screw rod driving piece, 241, a rotating disc, 242, a handle, 25, a pressure adjusting piece, 26, a pressure gauge, 251, an oil drain valve, 253, an oil drain hole and 27, are heat insulation pads; 3 is a temperature control component, 31 is a heating cover, 311 is a first heating part, and 312 is a second heating part.

Detailed Description

The present invention will be described in further detail with reference to specific examples.

In the description of the present invention, it should be noted that the terms "above", "below", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally found to be used in products of the present invention, and are merely used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

Example 1

Fig. 1 is a schematic structural diagram of a small-batch sintering and forming device for powder materials, as shown in fig. 1, the small-batch sintering and forming device for powder materials comprises a support 1, a tabletting assembly 2 and a temperature control assembly 3; the support 1 comprises a base 11, a supporting rod 12, one end of which is fixed on the base 11 and the other end of which is connected with a top plate 13; the tabletting assembly 2 comprises a platform 21 for placing a tabletting mold, a pressure regulating part 25 arranged in the base 11 and connected with the platform 21, a cover plate 22, a screw rod 23 connected with the cover plate 22 and used for driving the cover plate 22 to move downwards so as to compress the tabletting mold, and a screw rod driving part 24 connected with the screw rod 23 and used for driving the screw rod 23 to lift; the temperature control assembly comprises a heating cover 31 arranged on the platform 21 at the bottom, and the inner diameter of the heating cover 31 is the same as the diameter of the cover plate 22. The same is not meant to be absolutely the same, that is, the gap between the inner diameter of the heating cover 31 and the diameter of the cover plate 22 is 0.5 to 1.5mm, and the heat loss during heating is not excessive, which is included in the "same" in the present invention. When heating, a sealed heating chamber is formed between the heating cover 31 and the cover plate 22.

The pressure adjusting member 25 is a hydraulic adjuster, as shown in fig. 1, the pressure adjusting member 25 includes an oil cylinder disposed in the platform 21, a pressure gauge 26 disposed on the base 11, a pressurizing rocker 251 disposed on a side surface of the base 11, and an oil drain valve 252 and an oil drain hole 253 disposed on the base 11.

The screw driving member 24 includes a rotating plate 241 connected to the screw 23 and a handle 242 provided on the rotating plate 241.

The distance between the top plate and the platform is large, molds of different specifications can be placed, and the device can be used for preparing materials with different thicknesses.

The number of the supports is 3.

Fig. 3 is a schematic view of the top plate, and as shown in fig. 3, a through hole 131 for the screw rod 23 to pass through is formed in the top plate 13, and an internal thread in threaded fit with the screw rod 23 is formed on an inner wall of the through hole 131. The top plate 13 of the top plate 13 plays a role in guiding the screw rod 23 to keep vertical, so that the action point of the screw rod 23 on the cover plate 22 is ensured not to deviate, and the stability of the performance of tabletting is ensured. The support rod 12 is connected to the top plate 13 through a fastening nut, and the support rod 12 is connected with the bottom plate in an interference fit mode. So as to prevent the support rod 12 from rotating and affecting the performance of the tablet product.

Fig. 2 is a schematic view of a heating cover, and as shown in fig. 2, the heating cover 31 is an opening and closing structure, and the heating cover 31 includes a first heating part 311 and a second heating part 312 hinged to each other and a closing locking member; when the heating cover 31 is closed, the top ends of the first heating part and the second heating part form a hole for the screw rod 23 to pass through; the first heating part and the second heating part are respectively provided with heating resistance wires, and the outer walls of the first heating part and the second heating part are both provided with heat preservation layers. The first heating part 311 and the second heating part 312 are provided with handles for opening and closing, respectively.

The heating temperature of the heating cover is 25-1000 ℃, and the forming pressure of the tabletting component is 5-60 Mpa.

The small-batch sintering and forming device for the powder material is applied to sintering and forming of metal-based or ceramic-based electronic functional materials and ceramic-polymer composite materials.

The method comprises the following specific steps:

s1: putting the powder material to be molded into a mold, and assembling the mold;

s2: placing a mold on the platform 21 and a cover plate 22 on the mold; then the screw rod driving piece 24 controls the screw rod 23 to move downwards to compact the mold, and particularly the handle 242 is shaken to drive the turntable 241 connected with the screw rod to rotate so as to drive the screw rod 23 to move downwards, thereby achieving the purpose of compacting the mold;

s3: after the mould is compacted, the heating cover 31 is placed on the platform 21, the heating cover 21 is closed, and then the heating cover 21 is fixed on the platform by adopting a detachable fixing piece;

s4: setting heating temperature and forming pressure, and performing heat preservation and pressure maintaining treatment after the temperature and the pressure reach set values;

s5: after the heat preservation and pressure maintaining treatment is finished, firstly, pressure relief is carried out, then the handle 242 is rotated in the opposite direction, the screw rod 23 is driven to move upwards, and the heating cover 31 is opened for cooling;

s6: after the cooling is finished, the heating cover 21 is taken down, the mold is kept on the platform 21 not to shake during the cooling, the molded material is prevented from being damaged, and finally, the sample in the mold is subjected to demolding treatment to obtain a tablet sample.

The molding pressure is controlled and adjusted by a pressure adjusting piece 25, and the specific operation method comprises the following steps: after the oil drain valve 252 is screwed down, the pressurizing rocker 251 is shaken to pressurize until the pressure gauge 26 displays that a set pressure value is reached, and the pressurization is stopped; after the pressure holding is completed, the oil drain valve 252 is unscrewed to release the pressure.

A positioning mechanism is arranged at the center of the platform 21 to ensure that the die can be accurately placed at the center of the platform, ensure the uniformity of the pressure of the powder material and further ensure the uniform thickness and the stable grain size of the powder material after molding; the positioning mechanism is a positioning groove matched with the diameter of the die in size.

Example 2

The embodiment is an application of a small-batch sintering and forming device for powder materials in high-temperature sintering and forming of the powder materials. Specifically, this example uses BaTiO₃The present invention will be described in further detail based on the medium-high temperature sintering molding of X7R ceramic. The operation steps are as follows: commercial 100nm BaTiO₃Based on X7R ceramic powder as a raw material, the powder material is sintered into a ceramic piece with the diameter of 10mm and the thickness of 1mm by using the small-batch sintering forming device of the powder material at 600 ℃ and 120 MPa. The obtained ceramic wafer sample is subjected to performance test, and the performance is as follows: relative density>97% dielectric constant>3000, low dielectric loss<Capacitance change within the temperature range of 1%, -55 ℃ to 125 DEG C<10% resistivity>10¹³Ohm cm. According to the performance test result, the ceramic chip sample prepared by the powder material small-batch sintering forming device has the excellent performances of high dielectric constant, low dielectric loss, good temperature stability and high resistivity.

Example 3

The embodiment is an application of a small-batch sintering and forming device for powder materials in cold sintering and forming of the powder materials. Specifically, this embodiment uses Li₂Ca₂Mo₃O₁₂The cold sintering and forming of the microwave dielectric ceramic are further detailed. In the embodiment, molybdenum oxide with the purity of 99.5%, lithium carbonate and calcium carbonate are used as raw materials, and corresponding powder is obtained after ball milling, drying and presintering are combined, and the powder material is used for preparing ceramic plates with the diameter of 10mm and the thickness of 5mm by a small-batch sintering forming device at 300 ℃ and 150 MPa. The obtained ceramic sheet is subjected to performance test, and the performance is as follows: relative density>98.5%, dielectric constant of 8.2, Q x f>The temperature coefficient of resonance frequency of 80000GHz and tauf is-80 ppm/DEG C. Prepared Li₂Ca₂Mo₃O₁₂The dielectric constant of the base microwave dielectric ceramic plate is lower than 15; the Q multiplied by f value is higher, which indicates that the dielectric loss of the obtained ceramic chip is small; the temperature coefficient of the resonant frequency is close to zero, which shows that the temperature stability is good, and the ceramic chip can meet the requirement of radarThe use requirements in the fields of missile remote control, satellite communication, GPS antenna and the like. Further, the small-batch sintering and forming device for the powder material can be applied to a forming process of powder materials which are easy to decompose or contain volatile components.

The above-described preferred embodiments of the present invention are not intended to limit the present invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the claims of the present invention.