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Aluminum nitride and boron nitride composite ceramic material and preparation method thereof

A composite ceramic and boron nitride technology, applied in glass manufacturing equipment, manufacturing tools, glass molding, etc., can solve problems such as poor oxidation resistance, and achieve high flexural flexural strength, good thermal conductivity and flexural resistance. Effect of strength, high thermal conductivity

Active Publication Date: 2020-06-02
XIAMEN UNIV OF TECH
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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 overcome the problem of poor oxidation resistance of existing graphite molds, and provide an aluminum nitride boron nitride composite ceramic material, which can replace graphite as a new curved glass hot bending mold material to produce hot bending molds. Hot bending dies take advantage of the high thermal conductivity, high oxidation resistance and high flexural strength of aluminum nitride and the easy processing characteristics of boron nitride

Method used

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  • Aluminum nitride and boron nitride composite ceramic material and preparation method thereof
  • Aluminum nitride and boron nitride composite ceramic material and preparation method thereof
  • Aluminum nitride and boron nitride composite ceramic material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Put 80 grams of aluminum nitride powder and 20 grams of boron nitride powder into a nylon ball mill jar, add alcohol and alumina balls and seal them, and then ball mill for 10 hours. The amount of alcohol used should not exceed 2 / 2 of the volume of the nylon ball mill jar. 3. The amount of alumina grinding balls used is twice the total mass of the mixed powder, and a slurry is formed after ball milling. Put the slurry in a vacuum oven at 60° C. for 8 hours to vacuum-dry to obtain aluminum nitride boron nitride composite powder. The composite powder is hot-pressed and sintered. The sintering temperature is 1820°C, and the temperature is kept for 5 hours. The sintering pressure is increased to 20MPa within 10 minutes after the temperature rises. The nitrogen pressure is kept at 1.2KPa to 1.6KPa, and the aluminum nitride boron nitride composite ceramic material is obtained after sintering. Aluminum nitride boron nitride ceramics are processed and polished according to cus...

Embodiment 2

[0042] Put 75 grams of aluminum nitride powder and 25 grams of boron nitride powder into a nylon ball mill jar, add alcohol and alumina balls and seal them, and then ball mill for 8 hours. The amount of alcohol used should not exceed 2 / 2 of the volume of the nylon ball mill jar. 3. The amount of alumina grinding balls used is twice the total mass of the mixed powder, and a slurry is formed after ball milling. Put the slurry in a vacuum oven at 60° C. for 6 hours to vacuum-dry to obtain aluminum nitride boron nitride composite powder. The composite powder is hot-pressed and sintered, the sintering temperature is 1780°C, and the temperature is kept for 8 hours. The sintering pressure is increased to 25MPa within 10 minutes after the temperature rises, and the pressure is released when the heat preservation is completed and the temperature drops to 1200°C. The nitrogen pressure is kept at 1.2KPa to 1.6KPa, and the aluminum nitride boron nitride composite ceramic material is obtai...

Embodiment 3

[0045] Put 70 grams of aluminum nitride powder and 30 grams of boron nitride powder into a nylon ball mill jar, add alcohol and alumina balls and seal them, and then perform ball milling for 8 hours. The amount of alcohol used should not exceed 2 / 2 of the volume of the nylon ball mill jar. 3. The amount of alumina grinding balls used is twice the total mass of the mixed powder, and a slurry is formed after ball milling. Put the slurry in a vacuum oven at 60° C. for 6 hours to vacuum-dry to obtain aluminum nitride boron nitride composite powder. The composite powder is hot-pressed and sintered. The sintering temperature is 1800°C, and the temperature is kept for 4 hours. The sintering pressure is increased to 25MPa within 10 minutes after the temperature rises. The nitrogen pressure is kept at 1.2KPa to 1.6KPa, and the aluminum nitride boron nitride composite ceramic material is obtained after sintering. Aluminum nitride boron nitride ceramics are processed and polished accord...

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Abstract

The invention relates to an aluminum nitride and boron nitride composite ceramic material and a preparation method thereof. In the aluminum nitride and boron nitride composite ceramic material, the mass ratio of aluminum nitride to boron nitride is 9 / 1 to 3 / 2, layered boron nitride is uniformly distributed in an aluminum nitride matrix, a boron oxide film is formed at the grain boundary of aluminum nitride and boron nitride, and the thickness of the boron oxide film is 30-50nm. The aluminum nitride and boron nitride composite ceramic material has excellent oxidation resistance, and a mold madefrom the composite ceramic material has good comprehensive performances such as heat conductivity, bending strength, processing and polishing, can replace a graphite mold used at present, and solvesthe problems that the graphite mold needs to be used in a protective atmosphere, the precision is reduced, timing repair is needed and the like because the graphite mold is not resistant to oxidation.

Description

technical field [0001] The invention relates to mold production materials, in particular to an aluminum nitride boron nitride composite ceramic material and a preparation method thereof. Background technique [0002] Hot bending glass (also known as curved glass) can be made into various curved surfaces and complex appearances according to requirements. Quality requirements, with the improvement of industrialization level and quality of life, heat-curved surface glass has a very broad market growth space. Hot bending glass is a hot bending glass product that places the cut flat glass in a hot bending mold designed according to the bending arc, and then heats the glass to soften it, and then presses the softened glass through the mold to form a specific curved surface. The hot bending mold is a key component in the production of hot bending glass, which is directly related to the surface finish, dimensional accuracy, production cost and efficiency of hot bending glass. Ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/581C04B35/622C04B35/645C03B23/023
CPCC04B35/581C04B35/622C04B35/645C03B23/023C04B2235/386C04B2235/77C04B2235/96C04B2235/9607
Inventor 古思勇张厚安管军凯鲁慧峰麻季冬何庆
Owner XIAMEN UNIV OF TECH
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