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Method of preparing composite material of silicon nitride and silicon carbide by reverse reaction sintering

A technology of silicon nitride, silicon carbide, and composite materials, which is applied in the field of inorganic non-metallic material science and engineering, can solve the problems of inconvenient production by the nitriding method, and achieve the effects of large-scale production, high performance, and simple equipment

Active Publication Date: 2007-10-17
TONGDA REFRACTORY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing silicon nitride and silicon carbide composite materials by reverse reaction sintering, which solves the inconvenience brought by the nitriding method to production, so that silicon nitride and carbide can be prepared in an air atmosphere with a conventional sintering furnace. Silicon composite

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0014] 1. Ingredients: SiC: the particle size is 2.8mm sieve material and 0.9mm sieve material, the mass fraction ratio is 35%; SiC: the particle size is 0.9mm sieve material and 0.15mm sieve material, the mass fraction ratio is 30% %; SiC: undersize with a particle size of 0.115mm, the mass fraction ratio is 5%; SiC: undersize with a particle size of 0.045mm, with a mass fraction ratio of 4%; SiC with a particle size of over 0.004mm undersize, with a mass fraction ratio of 5%; silicon nitride (Si 3 N 4 ): the particle size is 0.074mm sieve material, the mass fraction ratio is 21%; the external resin mass ratio is 5%,

[0015] 2. Forming: Forming by vibration method, put the prepared mud into the steel mold on the vibration table, the vibration frequency of the vibration platform is 50 Hz, the amplitude is 0.1 mm, and the forming load is 8kPa.

[0016] 3. Drying: heat preservation at 150°C for 24hrs

[0017] 4. Firing: Firing in air atmosphere, firing heating curve:

[001...

example 2

[0023] 1. Ingredients: SiC: the particle size is 2.8mm sieve material and 0.9mm sieve material, the mass fraction ratio is 35%; SiC: the particle size is 0.9mm sieve material and 0.15mm sieve material, the mass fraction ratio is 30% %; SiC: undersize with a particle size of 0.115mm, the mass fraction ratio is 5%; SiC: undersize with a particle size of 0.045mm, with a mass fraction ratio of 5%; SiC with a particle size over 0.004mm undersize, with a mass fraction ratio of 5%; metal silicon, the particle size is 180 mesh sieve, and the mass fraction ratio is 3%; silicon nitride (Si 3 N 4 ): the particle size is 0.074mm undersize, and the mass fraction ratio is 17%; the mass ratio of resin is 7%.

[0024] 2. Forming: Forming by vibration method, put the prepared mud into the steel mold on the vibration table, the vibration frequency of the vibration platform is 50 Hz, the amplitude is 0.1 mm, and the forming load is 8kPa. The density of semi-finished products is controlled at 2...

example 3

[0032] 1. Ingredients: SiC: the particle size is 2.8mm sieve material and 0.9mm sieve material, the mass fraction ratio is 35%; SiC: the particle size is 0.9mm sieve material and 0.15mm sieve material, the mass fraction ratio is 30% %; SiC: the particle size is 0.115mm sieve material, the mass fraction ratio is 5%; metal silicon, the particle size is 180 mesh sieve material, the mass fraction ratio is 5%; silicon nitride (Si 3 N 4 ): the particle size is 0.074mm sieve material, the mass fraction ratio is 20%; silicon nitride (Si 3 N 4 ): the particle size is 0.004mm undersize, and the mass fraction ratio is 5%; the mass ratio of resin is 5%.

[0033] 2. Forming: Forming by vibration method, put the prepared mud into the steel mold on the vibration table, the vibration frequency of the vibration platform is 50 Hz, the amplitude is 0.1 mm, and the forming load is 8kPa.

[0034] 3. Drying: heat preservation at 150°C for 24hrs

[0035] 4. Firing: Firing in air atmosphere, firi...

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Abstract

A method for reverse reaction sintered Si3N4 / SiC composite belongs to the inorganic nonmetals science and engineering techniques field. The ingredients is that: Si3N4 and SiC serves as raw material, one to three of the Al, Si, SiO2 serve(s) as additive, and resin serves as anchoring agent, wherein the weight percentage of the ingredients is that 5~35% of Si3N4, 0~10% of additive, 0.5~9.5% of anchoring agent, and the balance is SiC. The mixture of the ingredients is adequately mixed in an agitator and then is formed the blank with a pressing density of 2.00~2.80 g / cm<3>. The obtained blank is dried and sintered in a kiln at 600~1500 DEG C with a rate of rise of 10~60 DEG C per hour, and the burnt temperature is 1350~1500 DEG C with thermal insulation for 1~12 hours. The present invention has the advantages of that the Si3N4 / SiC composite has higher performance, the equipment is simple; besides, the technology is safe and reliable, is convenient to be controlled and is adapted to mass production.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic material science and engineering, and particularly relates to a method for preparing silicon nitride and silicon carbide composite materials by reverse reaction sintering. Background technique [0002] Silicon nitride silicon carbide composite materials are widely used in metallurgy, aviation, machinery, chemical industry, ceramics, nonferrous metals and other industries due to their characteristics of anti-oxidation, good thermal shock resistance, and low high-temperature creep. Si 3 N 4 and SiC are covalent bonds and high-temperature easily oxidized compounds, their sintering properties are poor, Si 3 N 4 / SiC composites are usually prepared at very high temperature, even hot pressing and in N 2 Sintering is carried out under atmosphere. The production cost of this method is relatively high, the production process and control are complicated, and it is difficult to realize la...

Claims

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Application Information

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IPC IPC(8): C04B35/64C04B35/565C04B35/584
Inventor 王林俊孙加林吴宏鹏洪彦若任颖利冯运生
Owner TONGDA REFRACTORY TECH CO LTD
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