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Preparation method of dense sintering type composite aluminum nitride ceramics

A kind of aluminum nitride ceramics, dense technology, applied in the field of inorganic ceramic materials, can solve the problems that affect the heat conduction efficiency and mechanical properties of the product, the difficulty of powder densification and sintering, and the increase of powder porosity, so as to avoid local agglomeration, agglomeration, Good dispersion, volume shrinkage effect

Inactive Publication Date: 2019-05-17
常州欧利莱照明有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem mainly solved by the present invention is: in the process of preparing aluminum nitride powder by carbothermal reduction of traditional aluminum nitride ceramics, it is easy to cause product agglomeration, and excessive carbon needs to be added, and decarburization is required after the reaction is completed However, decarburization is difficult due to agglomeration, and the porosity of the powder increases due to decarburization, which is difficult to achieve densification and sintering of the powder, which affects the thermal conductivity and mechanical properties of the product. A dense sintered composite nitriding Preparation method of aluminum ceramics

Method used

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  • Preparation method of dense sintering type composite aluminum nitride ceramics

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example 1

[0025] In parts by weight, successively take 5 parts of graphene oxide, 5 parts of carbon fiber, 300 parts of water, and 0.8 part of melamine, add them to the beaker, and move the beaker to a digital speed measuring constant temperature magnetic stirrer, at a temperature of 65 ° C, the speed Under the condition of 400r / min, adjust the pH of the material in the beaker to 6.2 with hydrochloric acid while stirring at a constant temperature, stop stirring, keep the temperature for 3 hours, cool, and then freeze-dry in a vacuum to obtain carbon fiber / graphene oxide airgel; press In terms of parts by weight, 120 parts of aluminum alcohol salt, 50 parts of silicate, 100 parts of fatty acid, 80 parts of alcohol solvent, 15 parts of carbon fiber / graphene oxide airgel, 0.3 part of nano-iron powder, 0.2 part of fluorinated Sodium, first pour aluminum alcohol salt, silicate, fatty acid, alcohol solvent nano-iron powder and sodium fluoride into the reaction kettle, stir and mix with a stirr...

example 2

[0027] In parts by weight, successively take 5 parts of graphene oxide, 5 parts of carbon fiber, 300 parts of water, and 0.8 part of melamine, add them to the beaker, and move the beaker to a digital speed measuring constant temperature magnetic stirrer, at a temperature of 65 ° C, the speed Under the condition of 400r / min, adjust the pH of the material in the beaker to 6.2 with hydrochloric acid while stirring at a constant temperature, stop stirring, keep the temperature for 3 hours, cool, and then freeze-dry in a vacuum to obtain carbon fiber / graphene oxide airgel; press In terms of parts by weight, 120 parts of aluminum alcohol salt, 50 parts of silicate, 100 parts of fatty acid, 80 parts of alcohol solvent, 15 parts of carbon fiber / graphene oxide airgel, 0.3 part of nano-iron powder, 0.2 part of fluorinated Sodium, first pour aluminum alcohol salt, silicate, fatty acid, alcohol solvent nano-iron powder and sodium fluoride into the reaction kettle, stir and mix with a stirr...

example 3

[0029]In parts by weight, successively take 5 parts of graphene oxide, 5 parts of carbon fiber, 300 parts of water, and 0.8 part of melamine, add them to the beaker, and move the beaker to a digital speed measuring constant temperature magnetic stirrer, at a temperature of 65 ° C, the speed Under the condition of 400r / min, adjust the pH of the material in the beaker to 6.2 with hydrochloric acid while stirring at a constant temperature, stop stirring, keep the temperature for 3 hours, cool, and then freeze-dry in a vacuum to obtain carbon fiber / graphene oxide airgel; press In parts by weight, 120 parts of aluminum alcohol salt, 100 parts of fatty acid, 80 parts of alcohol solvent, 15 parts of carbon fiber / graphene oxide airgel, 0.3 part of nano-iron powder, 0.2 part of sodium fluoride are taken successively. Pour salt, fatty acid, alcohol solvent nano-iron powder and sodium fluoride into the reaction kettle, stir and mix with a stirrer at 800r / min for 60min, stop stirring, and ...

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Abstract

The invention discloses a preparation method of dense sintering type composite aluminum nitride ceramics, and belongs to the technical field of inorganic ceramic materials. The preparation method comprises the following steps: firstly uniformly mixing alcohol aluminum salt, silicate ester, fatty acid, an alcohols solvent-nano-iron powder and sodium fluoride, then adding carbon fiber / graphene oxideaerogel, and carrying out ultrasonic immersing, thus obtaining a mixed immersing solution; after heating and carrying out ultrasonic reaction on the mixed immersing solution, filtering, washing, anddrying, thus obtaining loaded filling aerogel; then reducing the loaded filling aerogel by hydrazine hydrate, thus obtaining reduced loaded filling aerogel; then carrying out temperature rising reaction on the reduced loaded filling aerogel step by step under a nitrogen protection state, thus preparing composite aluminum nitride powder; then mixing the composite aluminum nitride powder with calcium oxide, magnesium oxide, polyvinyl butyral and a solvent, molding through injection molding, then carrying out high-temperature sintering, and cooling, thus obtaining the dense sintering type composite aluminum nitride ceramics. The dense sintering type composite aluminum nitride ceramics obtained by the invention has excellent mechanical performance and excellent heat conduction efficiency.

Description

technical field [0001] The invention discloses a preparation method of dense sintered composite aluminum nitride ceramics, which belongs to the technical field of inorganic ceramic materials. Background technique [0002] Aluminum nitride is a ceramic material with excellent comprehensive properties, and its research can be traced back to more than one hundred years ago, but it was only used as a nitrogen fixer and used as a fertilizer at that time. Aluminum nitride is a covalent compound with small self-diffusion coefficient and high melting point, which makes it difficult to sinter. It was not until the 1950s that people successfully produced aluminum nitride ceramics for the first time, which were used as refractory materials in pure iron, aluminum and aluminum alloys. Waiting for smelting. Since the 1970s, with the continuous deepening of research, the preparation technology of aluminum nitride has become increasingly mature, and the scope of application has also contin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/582C04B35/622C04B35/626C04B35/64C04B35/80
Inventor 陈倩
Owner 常州欧利莱照明有限公司
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