Method for producing components and parts made of aluminium nitride ceramics in high thermal conductivity and high dimensional accuracy

A technology of aluminum nitride ceramics and dimensional accuracy, which is applied in the field of injection molding to achieve uniform performance, low cost, and shortened degreasing time.

Inactive Publication Date: 2005-10-26
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing aluminum nitride ceramic parts with high thermal conductivity and high dimensional accur

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Aluminum nitride powder, yttrium oxide powder according to AlN:Y 2 o 3 = 96:4 batching, with absolute ethanol as the medium, wet mixed grinding of the two powders for 5 hours, drying at 50°C, crushing and sieving to obtain the mixed powder. The binder is composed of 60% paraffin wax, 25% high-density polyethylene, 10% polypropylene and 5% stearic acid, and the volume ratio of the powder is 60%. After mixing on the rubber machine, granulate on the PSJ32 mixing extruder to make the feeding more uniform. The feeding is injection-molded on the CJ80-E injection machine. The injection temperature is 160 ° C and the injection pressure is 100 MPa. The resulting injection blank Extract and degrease in trichlorethylene for 4 hours, then dry at 60°C for 30 minutes, and then put it in an atmosphere degreasing furnace for thermal degreasing. The thermal degreasing time is 8 hours, and the degreasing body is pre-sintered at 1300°C for 1 hour. Finally, put it in an aluminum nitride ...

Embodiment 2

[0019] Aluminum nitride powder, yttrium oxide powder according to AlN:Y 2 o 3 = 96:4 batching, with absolute ethanol as the medium, after wet mixing and grinding for 5 hours, the two powders were dried at 60°C, then pulverized and sieved to obtain the mixed powder. The binder is composed of 55% paraffin, 25% high-density polyethylene, 15% polypropylene and 5% stearic acid, and the volume ratio of the powder is 60%. After mixing on the rubber machine, granulate on the PSJ32 mixing extruder to make the feeding more uniform. The feeding is injection molded on the CJ80-E injection machine. The injection temperature is 150 °C and the injection pressure is 110 MPa. Extract and degrease in trichlorethylene for 4 hours, then dry at 60°C for 30 minutes and then place it in an atmosphere degreasing furnace for thermal degreasing. The thermal degreasing time is 8 hours, and the degreasing body is pre-sintered at 1300°C for 1 hour. , and then placed in an aluminum nitride ceramic crucib...

Embodiment 3

[0021] Aluminum nitride powder, yttrium oxide powder according to AlN:Y 2 o 3 = 95:5 batching, with absolute ethanol as the medium, wet mixed grinding of the two powders for 5 hours, drying at 60°C, crushing and sieving to obtain the mixed powder. The binder is composed of 50% paraffin wax, 25% high-density polyethylene, 15% polypropylene and 10% stearic acid, and the volume ratio of the powder is 58%. After mixing on the rubber machine, granulate on the PSJ32 mixing extruder to make the feeding more uniform. The feeding is injection-molded on the CJ80-E injection machine. The injection temperature is 160 ° C and the injection pressure is 100 MPa. The resulting injection blank Extract and degrease in trichlorethylene for 4 hours, then dry at 60°C for 30 minutes and then place it in an atmosphere degreasing furnace for thermal degreasing. The thermal degreasing time is 8 hours, and the degreasing body is pre-sintered at 1300°C for 1 hour. , and then placed in an aluminum nitr...

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Abstract

The present invention provides an aluminium nitride ceramic compnoent with high heat conductivity and high size accuracy and its preparation method. Said method includes the following steps: uniformly mixing aluminium nitride AlN powder and yttrium oxide Y2O3 powder according to mixing ratio of 90-98:2:10, adding binding agent, mixing them into uniform feeding material, the volume ratio of powder in the feeding material is 54-68%, injection moulding, injection temperature is 120-170 deg.C and injection pressure is 80-140 MPa, after the injected blank body is grease-removed and presintered, sintering in the flowing nitrogen gas atmosphere in the sintering furnace with 1700-2000 deg.C, heat-insulating for 1-10 hr, so as to obtain the aluminium nitride ceramic component.

Description

technical field [0001] The invention belongs to the technical field of injection molding, and in particular provides a method for preparing aluminum nitride ceramic parts with high thermal conductivity and high dimensional precision. Background technique [0002] Aluminum nitride ceramics have high thermal conductivity, low dielectric constant and dielectric loss, reliable electrical insulation, high temperature resistance, corrosion resistance, non-toxicity, good mechanical properties, and a thermal expansion coefficient that matches silicon. The series of excellent properties can be applied not only as functional ceramic materials (such as substrates and packaging materials of integrated circuits), but also as structural materials (such as components used in high temperature and corrosive environments). Aluminum nitride ceramics have become one of the research hotspots in the field of modern new materials. [0003] There are many forming processes for aluminum nitride cer...

Claims

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Application Information

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IPC IPC(8): C04B35/582
Inventor 曲选辉秦明礼杜学丽李帅
Owner UNIV OF SCI & TECH BEIJING
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