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A kind of preparation method of silicon carbide-silicon nitride porous composite ceramics

A composite ceramic and silicon nitride technology, applied in ceramic products, other household appliances, household appliances, etc., can solve the problem that the content of silicon carbide and porosity cannot be adjusted separately, and achieve the effect of uniform distribution and uniform pore size.

Active Publication Date: 2020-03-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the content of nano-carbon powder affects both the content of silicon carbide and the porosity in the material, there is still the problem that the content of silicon carbide and the porosity cannot be adjusted separately

Method used

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  • A kind of preparation method of silicon carbide-silicon nitride porous composite ceramics
  • A kind of preparation method of silicon carbide-silicon nitride porous composite ceramics
  • A kind of preparation method of silicon carbide-silicon nitride porous composite ceramics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1) Heat treatment of silicon carbide precursor: heat polycarbosilane to 900°C in vacuum at a heating rate of 5°C / min, and keep it warm for 0.5 hours;

[0044] 2) Slurry preparation: 15 parts by weight of gel monomer, 1 part by weight of crosslinking agent, 3 parts by weight of dispersant, and 81 parts by weight of water are mixed to form a premix, and 10 parts by weight of yttrium oxide, 5 parts by weight of Parts by weight of aluminum oxide, 59.5 parts by weight of silicon nitride and 25.5 parts by weight of pre-sintered polycarbosilane powder form a slurry;

[0045] 3) Ball milling: ball milling the slurry for 6 hours;

[0046] 4) Gel injection molding: In nitrogen, add 0.9 parts by weight of monomer catalyst and initiator to the ball-milled slurry, stir evenly and pour it into the mold. After 30 minutes of reaction, the slurry is solidified into a green body, which is demoulded and taken out;

[0047] 5) Drying: Put the green body into the air with a temperature of ...

Embodiment 2

[0051] 1) Heat treatment of silicon carbide precursor: heat polycarbosilane to 900°C in vacuum at a heating rate of 5°C / min, and keep it warm for 0.5 hours;

[0052] 2) Slurry preparation: 15 parts by weight of monomer, 1 part by weight of crosslinking agent, 3 parts by weight of dispersant, and 81 parts by weight of water are mixed to form a premix, and 10 parts by weight of yttrium oxide, 5 parts by weight of Aluminum oxide, 68 parts by weight of silicon nitride and 17 parts by weight of pre-sintered polycarbosilane powder form a slurry;

[0053] 3) Ball milling: ball milling the slurry for 6 hours;

[0054] 4) Gel injection molding: In nitrogen, add 0.9 parts by weight of monomer catalyst and initiator to the ball-milled slurry, stir evenly and pour it into the mold. After 30 minutes of reaction, the slurry is solidified into a green body, which is demoulded and taken out;

[0055] 5) Drying: Put the green body into the air with a temperature of 40°C and a relative humidit...

Embodiment 3

[0058] 1) Heat treatment of silicon carbide precursor: heat polycarbosilane to 900°C in vacuum at a heating rate of 5°C / min, and keep it warm for 0.5 hours;

[0059] 2) Slurry preparation: 15 parts by weight of monomer, 1 part by weight of crosslinking agent, 3 parts by weight of dispersant, and 81 parts by weight of water are mixed to form a premix, and 10 parts by weight of yttrium oxide, 5 parts by weight of Aluminum oxide, 80.75 parts by weight of silicon nitride and 4.25 parts by weight of pre-sintered polycarbosilane powder form a slurry;

[0060] 3) Ball milling: ball milling the slurry for 6 hours;

[0061] 4) Gel injection molding: In nitrogen, add 0.9 parts by weight of monomer catalyst and initiator to the ball-milled slurry, stir evenly and pour it into the mold. After 30 minutes of reaction, the slurry is solidified into a green body, which is demoulded and taken out;

[0062] 5) Drying: Put the green body into the air with a temperature of 40°C and a relative hu...

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Abstract

The invention discloses a preparation method of silicon carbide-silicon nitride porous composite ceramic. The preparation method comprises steps as follows: 1) polycarbosilane powder is subjected to thermal treatment in a vacuum or protective atmosphere; 2) a gel monomer, a crosslinking agent and a dispersant are dissolved and dispersed in water, a premix liquid is obtained and mixed with sintering aid powder, silicon nitride powder and the polycarbosilane powder subjected to thermal treatment, and grout is obtained; 3) the grout is subjected to ball milling, and a blank is prepared with an injection molding method; 4) the blank is dried and sintered, and the silicon carbide-silicon nitride porous composite ceramic is obtained. With the adoption of the method, the content of silicon carbide and the porosity of the silicon carbide-silicon nitride porous composite ceramic can be adjusted in a larger range at will, and the porous ceramic with uniform porosity is prepared.

Description

technical field [0001] The invention relates to a preparation method of silicon carbide-silicon nitride porous composite ceramics, in particular to a method for regulating the porosity and silicon carbide content of silicon carbide-silicon nitride porous composite ceramics by using heat-treated polycarbosilane; it belongs to porous composite field of ceramic materials. Background technique [0002] Porous ceramics not only have the basic characteristics of small porous material density and large specific surface area, but also have performance advantages such as high temperature resistance and corrosion resistance, making them occupy an extremely important position in high temperature resistant porous materials. In recent years, the development and application of porous ceramics have attracted much attention, and have been widely used in electronics, environmental protection, energy, chemical industry and other fields. [0003] Silicon carbide and silicon nitride have excel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/584C04B35/571C04B35/622C04B38/02
CPCC04B35/571C04B35/584C04B35/622C04B38/02C04B2235/6023C04B2235/606C04B2235/656C04B2235/6562C04B2235/6567C04B2235/658C04B2235/77C04B2235/96
Inventor 肖鹏王依晨
Owner CENT SOUTH UNIV
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