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Silicon nitride ceramic powder capable of rapid sintering and its preparation method

A silicon nitride ceramic powder and rapid sintering technology, which is applied in the field of ceramic materials, can solve the problems of long sintering cycle, overheated silicon waste rate, etc., and achieve good sintering activity, increase density and strength, and uniform grain size.

Active Publication Date: 2020-02-04
江苏东浦精细陶瓷科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the sintering cycle of silicon nitride ceramics is long, and it is easy to cause overheating, which will cause silicon flow and increase the scrap rate

Method used

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Examples

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preparation example Construction

[0016] The invention provides a method for preparing silicon nitride ceramic powder capable of rapid sintering, comprising:

[0017] S1. Dissolving 10-15 parts by weight of yttrium alkoxide and 5-8 parts by weight of aluminum alkoxide in 200-250 parts by weight of alcohol solvent to form a sol.

[0018] S2. Add 95-110 parts by weight of α-silicon nitride and 5-8 parts by weight of β-silicon nitride to the sol during stirring, add ammonia water dropwise to adjust the pH value to 9-10, heat to 60-80°C and seal 4 -8h, a gel was formed.

[0019] S3. Calcining and drying the gel to obtain surface-modified silicon nitride.

[0020] S4. Mixing surface-modified silicon nitride with 5-8 parts by weight of boron nitride nanotubes and 8-12 parts by weight of silicon carbide whiskers to obtain silicon nitride ceramic powder capable of rapid sintering.

[0021] In the above method, a composite system of α-silicon nitride and β-silicon nitride is used for sintering, and β-silicon nitride ...

Embodiment 1

[0041] A method for preparing silicon nitride ceramic powder capable of rapid sintering, comprising:

[0042]S1. Dissolving 12kg of yttrium alkoxide and 6kg of aluminum alkoxide in 220kg of alcohol solvent to form a sol. Wherein the yttrium alkoxide is ethoxide, the aluminum alkoxide is ethoxide, and the alcohol solvent is absolute ethanol.

[0043] S2. Add 105 kg of α-silicon nitride and 6 kg of β-silicon nitride to the sol while stirring, add 3 kg of triethylenetetramine and mix evenly, add ammonia water dropwise to adjust the pH to 9-10, heat to 60-80°C and seal for 6 hours , forming a gel.

[0044] S3. Calcining and drying the gel at a temperature of 400-500° C. to obtain surface-modified silicon nitride.

[0045] S4. Disperse surface-modified silicon nitride, 6kg boron nitride nanotubes and 10kg silicon carbide whiskers in ethanol, stir at a speed of 500r / min for 1.5h, and then dry at a temperature of 120-150°C until The content of the organic solvent is not higher tha...

Embodiment 2

[0047] A method for preparing silicon nitride ceramic powder capable of rapid sintering, comprising:

[0048] S1. Dissolving 10kg of yttrium alkoxide and 8kg of aluminum alkoxide in 200kg of alcohol solvent to form a sol. Wherein the yttrium alkoxide is ethoxide, the aluminum alkoxide is isopropoxide, and the alcohol solvent is absolute ethanol and isopropanol with a mass ratio of 1:1.

[0049] S2. Add 95 kg of α-silicon nitride and 5 kg of β-silicon nitride to the sol while stirring, add 2 kg of triethylenetetramine and mix well, add ammonia water dropwise to adjust the pH to 9-10, heat to 60-80°C and seal for 4 hours , forming a gel.

[0050] S3. Calcining and drying the gel at a temperature of 400-500° C. to obtain surface-modified silicon nitride.

[0051] S4. Disperse surface-modified silicon nitride, 5kg boron nitride nanotubes and 8kg silicon carbide whiskers in ethanol, stir for 2h at a speed of 400r / min, and then dry at a temperature of 120-150°C until organic The ...

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Abstract

The invention relates to silicon nitride ceramic powder capable of realizing rapid sinter molding as well as a preparation method thereof, and belongs to the field of a ceramic material. The preparation method comprises the following steps: dissolving 10 to 15 weight parts of yttrium alcohol salt and 5 to 8 weight parts of aluminum alcohol salt into 200 to 250 weight parts of an alcohol solvent toform sol; adding 95 to 110 weight parts of alpha-silicon nitride and 5 to 8 weight parts of beta-silicon nitride into the sol during stirring, adding ammonia water dropwise to adjust the pH value tobe 9 to 10, heating to 60 to 80 DEG C and sealing for 4 to 8 hours to form gel; calcining and drying the gel to obtain surface modified silicoin nitride; and mixing the surface modified silicon nitride, 5 to 8 weight parts of boron nitride nanotube and 8 to 12 weight parts of a silicon carbide crystal whisker to obtain the silicon nitride ceramic powder capable of realizing rapid sinter molding. The preparation method is simple to operate; the prepared silicon nitride ceramic powder can be applied to rapid sinter molding of the silicon nitride ceramic; and the silicon nitride ceramic obtainedthrough sintering has the characteristics of high bending strength, excellent crack resistance and the like.

Description

technical field [0001] The invention relates to the field of ceramic materials, and in particular to a silicon nitride ceramic powder capable of rapid sintering and a preparation method thereof. Background technique [0002] Due to the advantages of high specific strength, high specific modulus, high temperature resistance, oxidation resistance and wear resistance, silicon nitride ceramics have special use value in the working environment of high temperature, high speed and strong corrosive medium. It has strong thermal shock ability, low dielectric constant and dielectric loss, and good high-frequency electromagnetic wave transmission performance, which makes it have a wide application prospect. [0003] In the prior art, the sintering period of silicon nitride ceramics is long, and overheating is easy to occur, which causes flow of silicon and increases the reject rate. Therefore, it is of great significance to rapidly sinter and form silicon nitride ceramics and obtain s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/584C04B35/624C04B35/622C04B35/81C04B35/645
CPCC04B35/584C04B35/622C04B35/624C04B35/645C04B35/80C04B2235/3217C04B2235/3225C04B2235/449C04B2235/5244C04B2235/5284C04B2235/6586C04B2235/96
Inventor 颜井意刘广巍杜建周梁广伟杨子润
Owner 江苏东浦精细陶瓷科技股份有限公司
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