Sintering aid for preparing silicon nitride ceramics, application of sintering aid and preparation method of silicon nitride ceramics

A technology of silicon nitride ceramics and sintering aids, applied in the field of silicon nitride ceramics

Inactive Publication Date: 2021-07-13
SINOMA ADVANCED NITRIDE CERAMICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current silicon nitride materials still cannot meet the above requirements. Therefore, effectively improving the mechanical properties of silicon nitride materials is still one of the more valuable research topics.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0041] The present invention also provides a preparation method of silicon nitride ceramics, comprising the following steps:

[0042] After mixing the sintering aid, ethanol and silicon nitride, they are sequentially mixed with the dispersant and the glue solution to obtain a slurry;

[0043] The slurry is subjected to spray granulation to obtain granulated powder;

[0044] Sequentially pressing and firing the granulated powder into a green compact to obtain the silicon nitride ceramics;

[0045] The sintering aid is the sintering aid described in the above technical solution.

[0046] In the invention, after mixing the sintering aid, ethanol and silicon nitride, they are mixed with the dispersant and the glue solution in sequence to obtain the slurry.

[0047] In the present invention, the raw materials for the preparation of the sintering aid are preferably component A with an average particle size < 1 μm, component B with an average particle size < 1 μm, and component C w...

Embodiment 1

[0068] Mix 6g of titanium dioxide with an average particle size of 10m 2 / g, oxygen content<2.00%, iron content<0.20%, carbon content<0.50%), grind to D50<1 μm, after adding 4g citric acid, add 120g glue solution (polyvinyl butyral in the glue solution The mass concentration of paraffin is 5%, and the mass concentration of paraffin in the glue solution is 10%) to obtain a slurry with a solid content of 41%. At a rotating speed of 350r / min, stir for 4h and carry out spray granulation. The pressure of the feed pump for granulation is 0.8MPa, the inlet temperature is 205°C, and the cyclone pressure difference is 0.9KPa to obtain granulated powder;

[0069] The granulated powder is pressed and fired in turn, the pressing pressure of the green compact is 280MPa, the holding time is 60s, and the pressure relief rate is 3MPa / s; the temperature is raised at a heating rate of 0.5°C / min to After debinding at 650° C. and keeping it warm for 10 hours, sintering was carried out at a tempe...

Embodiment 2

[0071] Mix 6g of titanium dioxide with an average particle size 10m 2 / g, oxygen content<2.00%, iron content<0.20%, carbon content<0.50%), grind to D50<1 μm, after adding 4g citric acid, add 120g glue solution (polyvinyl butyral in the glue solution The mass concentration of paraffin is 5%, and the mass concentration of paraffin in the glue solution is 10%) to obtain a slurry with a solid content of 41%. At a rotating speed of 350r / min, stir for 4h and carry out spray granulation. The pressure of the feed pump for granulation is 0.8MPa, the inlet temperature is 205°C, and the cyclone pressure difference is 0.9KPa to obtain granulated powder;

[0072] The granulated powder is pressed and fired in turn, the pressing pressure of the green compact is 280MPa, the holding time is 60s, and the pressure relief rate is 3MPa / s; the temperature is raised at a heating rate of 0.5°C / min to After debinding at 650° C. and keeping it warm for 10 hours, sintering was carried out at a temperat...

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Abstract

The invention relates to the technical field of silicon nitride ceramics, and in particular, relates to a sintering aid for preparing silicon nitride ceramics, an application of the sintering aid and a preparation method of the silicon nitride ceramics. The invention provides the sintering aid for preparing the silicon nitride ceramics. The sintering aid comprises a component A, a component B and a component C; the particle size of the sintering aid is less than or equal to 100 nm; the mass ratio of the component A to the component B to the component C is (1-5):(1-10):(1-10); the component A comprises titanium dioxide; the component B comprises boric oxide, magnesium oxide or calcium oxide; and the component C comprises a rare earth metal oxide. The sintering aid can effectively improve the mechanical property of the silicon nitride ceramics.

Description

technical field [0001] The invention relates to the technical field of silicon nitride ceramics, in particular to a sintering aid for preparing silicon nitride ceramics and its application, and a method for preparing silicon nitride ceramics. Background technique [0002] Silicon nitride ceramic material has the properties of high strength, low density, strong wear resistance, good corrosion resistance, high thermal shock resistance, self-lubrication and good electrical insulation. It is the preferred material for the production of various structural ceramic parts. At the same time, it also has great development potential, and has a wide range of applications in the fields of aerospace, machinery and chemical industry. [0003] However, with the development of modern technology, the performance requirements for corresponding materials are also increasing. For example, silicon nitride materials used in integrated circuit IC substrates, ultrasonic probes and other devices requ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/64C04B35/584C04B35/587C04B35/622
CPCC04B35/64C04B35/584C04B35/587C04B35/622C04B2235/5445
Inventor 张伟儒丁智杰孙峰董廷霞徐学敏李泽坤徐金梦李洪浩魏文钊曹冲
Owner SINOMA ADVANCED NITRIDE CERAMICS CO LTD
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