Silicon nitride ceramic powder capable of realizing rapid sinter molding as well as preparation method thereof

A technology of silicon nitride ceramic powder and rapid sintering

Active Publication Date: 2018-10-16
江苏东浦精细陶瓷科技股份有限公司
View PDF3 Cites 2 Cited by
  • 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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0016] The invention provides a method for preparing silicon nitride ceramic powder that can be quickly sintered and formed, including:

[0017] S1. Dissolve 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 while stirring, add ammonia water dropwise to adjust the pH to 9-10, then heat to 60-80°C and seal 4 -8h to form a gel.

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

[0020] S4. Mix the 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 that can be quickly sintered and molded.

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

Example Embodiment

[0040] Example 1

[0041] A method for preparing silicon nitride ceramic powder capable of rapid sintering and molding includes:

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

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

[0044] S3. The gel is calcined and dried at a temperature of 400-500°C to obtain surface-modified silicon nitride.

[0045] S4. Disperse the surface-modified silicon nitride, 6kg boron nitride nanotubes and 10kg silicon carbide whiskers in ethanol, stir at 500r / min for 1.5h, and then dry them at a temperature of 120-150℃ The content of the organic solvent is not higher than 1 wt%, an...

Example Embodiment

[0046] Example 2

[0047] A method for preparing silicon nitride ceramic powder that can be quickly sintered and formed includes:

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

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

[0050] S3. The gel is calcined and dried at a temperature of 400-500°C to obtain surface-modified silicon nitride.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap