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Method for preparing silicon nitride and silicon carbide compounded powder through self-propagating combustion

A technology of silicon nitride composite silicon carbide and self-propagating combustion, which is applied in the field of inorganic non-metallic materials, can solve the problems of complex process, poor mixing effect and high production cost of silicon nitride composite silicon carbide powder, and achieve the convenience of grinding after grinding Good treatment and sintering activity and high production efficiency

Inactive Publication Date: 2010-07-14
NO 52 INST OF CHINA NORTH IND GRP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art, and provide a kind of method for preparing silicon nitride composite silicon carbide powder by self-propagating combustion, mainly solve the complicated process of producing silicon nitride composite silicon carbide powder in the existing method, Problems such as poor mixing effect, high production cost and high energy consumption

Method used

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  • Method for preparing silicon nitride and silicon carbide compounded powder through self-propagating combustion
  • Method for preparing silicon nitride and silicon carbide compounded powder through self-propagating combustion
  • Method for preparing silicon nitride and silicon carbide compounded powder through self-propagating combustion

Examples

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Effect test

Embodiment 1

[0025] Example 1, 300 mesh metal silicon powder, purity > 98.5%, iron content < 0.8%, with steel balls as the ball milling medium, placed in a steel tank, material: ball weight ratio is 1: 2, on a planetary ball mill Carry out 12 hours of ball milling; the silicon powder after ball milling is as the raw material of next step mixing; By weight metal silicon powder (after ball milling) is 50%, and weight is 1000 grams, and high-purity carbon black is 5%, and weight is 100 gram, silicon nitride powder body is 45% (average particle diameter is 3 μm), and weight is 900 grams, after mixing, be ball milling medium with steel ball, be placed in corundum tank, material: ball weight ratio is 1: 2, put Stir and ball mill on a pot mill for 1 hour, and the evenly mixed material passes through a 40-mesh sieve, and the sieved material is evenly placed in a porous semi-cylindrical graphite boat, and then put into a self-propagating synthesis reactor, pumped After vacuuming, fill it with 5MPa ...

Embodiment 2

[0027] Example 2, 300 mesh metal silicon powder, purity > 98.5%, iron content < 0.8%, with steel balls as the ball milling medium, placed in a steel tank, material: ball weight ratio is 1: 5, on a planetary ball mill Carry out 16 hours of ball milling, the silicon powder after ball milling is as the raw material of next step mixing; By weight metal silicon powder (after ball milling) is 45%, and weight is 900 grams, and high-purity carbon black is 10%, and weight is 200 grams. gram, silicon nitride powder body is 45% (average particle diameter is 10 μ m), and weight is 900 grams, after mixing, be ball milling medium with steel ball, be placed in corundum tank, material: ball weight ratio is 1: 5, put Stir and ball mill on a pot mill for 4 hours, and the evenly mixed material passes through a 40-mesh sieve, and the sieved material is evenly placed in a porous semi-cylindrical graphite boat, and then put into a self-propagating synthesis reactor, pumped After vacuuming, fill it ...

Embodiment 3

[0029]Example 3, 200 mesh metal silicon powder, purity > 98.5%, iron content < 0.8%, with steel balls as the ball milling medium, placed in a steel tank, material: ball weight ratio is 1: 3, on a planetary ball mill Carry out the ball milling process of 14 hours; The silicon powder after the ball milling is as the raw material of next step mixing; By weight metal silicon powder (after ball milling) is 47%, and weight is 940 grams, and high-purity carbon black is 8%, and weight is 160 gram, silicon nitride powder body is 45% (average particle diameter is 6 μ m), and weight is 900 grams, after mixing, be ball milling medium with steel ball, be placed in corundum tank, material: ball weight ratio is 1: 4, put Stir and ball mill on a pot mill for 3 hours, and the evenly mixed material passes through a 40-mesh screen, and the sieved material is evenly placed in a porous semi-cylindrical graphite boat, and then put into a self-propagating synthesis reactor, pumped After vacuuming, f...

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Abstract

The invention discloses a method for preparing silicon nitride and silicon carbide compounded powder through self-propagating combustion, which is characterized by comprising treatment of raw materials, batching, mixing, self-propagating combustion to obtain finished products and other processing steps. The weight ratio of raw materials in the batching step is as follows: 45-50 percent by weight of metal silicon powder, 5-10 percent by weight of high-purity carbon black and 45 percent by weight of diluent. The invention has the advantages that the process is simple, the product purity is high, the investment is low, the prepared powder has good sintering activity, the whole process is simple and reliable, and large-scale production can be easily realized.

Description

Technical field: [0001] The invention belongs to the field of inorganic non-metallic materials, and specifically relates to a method for preparing silicon nitride composite silicon carbide powder by self-propagating combustion. The prepared silicon nitride composite silicon carbide powder can be widely used in fine ceramics and high-end refractory materials and other fields. Background technique: [0002] Since silicon nitride composite silicon carbide ceramics have unique physical and mechanical properties, such as low density, high strength, high hardness, wear resistance, corrosion resistance, and excellent thermal stability, they are used in aviation, aerospace, chemical industry, energy, machinery Manufacturing, weapons industry, metal smelting and other fields have broad application prospects. [0003] At present, the traditional method of preparing silicon nitride composite silicon carbide powder uses a single silicon nitride powder and silicon carbide powder to mix,...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/584C04B35/626C04B35/64
Inventor 李金富燕东明李康陈新力李国斌常永威高晓菊赵斌刘国玺徐志雄段关文王拥军
Owner NO 52 INST OF CHINA NORTH IND GRP CORP
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