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Method for preparing Al4SiC4 powder

A powder and system technology, which is applied in the synthesis of refractory materials and ceramics, can solve the problems of complex process, long reaction time and high energy consumption, and achieve the effect of simple preparation process, high ball milling efficiency and low energy consumption

Inactive Publication Date: 2009-05-06
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the disadvantages of complex process, long reaction time and high energy consumption, and the synthesized Al 4 SiC 4 Al which is easy to hydrate is unavoidable in the powder 3 C 4 Mutually

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Metal Al powder (particle size 10 μm, purity ≥ 99%), Si powder (particle size 10 μm, purity ≥ 99%) and carbon black (particle size ≤ 1 μm, purity ≥ 98%, volatile content ≤ 0.2%) in a molar ratio of 4:1 : 4.5 ingredients, dry-mix in polyurethane tank with ball-to-material ratio 3:1 for 3 hours; then take 50 grams of the mixture and put it into the ball mill tank of high-energy ball mill, add aluminum stearate with 0.2% of the mixture mass, put 500 grams For corundum balls, vacuumize to make the vacuum degree less than 1 Pa, pass in argon gas, and ball mill at 800 rpm for 20 hours. Al 4 SiC 4 The purity is more than 80%, and does not contain Al 3 C 4 Mutually.

Embodiment 2

[0017] Metal Al powder (particle size 5 μm, purity ≥ 99%), Si powder (particle size 10 μm, purity ≥ 99%) and carbon black (particle size ≤ 1 μm, purity ≥ 98%, volatile matter ≤ 0.2%) in a molar ratio of 4:1 : 4.2 ingredients, dry mix in a polyurethane tank for 4 hours with a ball-to-material ratio of 3:1; then take 50 grams of the mixture and put it into the ball mill tank of a high-energy ball mill, add aluminum stearate with a weight of 0.3% of the mixture, and put in 600 grams For corundum balls, vacuumize to make the vacuum degree less than 1 Pa, pass in argon gas, and ball mill at 900 rpm for 25 hours. The powder after ball milling was determined to be Al 4 SiC 4 , with a purity of over 84%, and does not contain Al 3 C 4 Mutually.

Embodiment 3

[0019] Metal Al powder (particle size 5 μm, purity ≥ 99%), Si powder (particle size 10 μm, purity ≥ 99%) and graphite (particle size ≤ 1 μm, purity ≥ 98%, volatile content ≤ 0.2%) in a molar ratio of 4:1: 4.2 Ingredients, dry mix in a polyurethane tank with a ball-to-material ratio of 3:1 for 4 hours; then take 50 grams of the mixture and put it into the ball mill tank of a high-energy ball mill, add aluminum stearate with a weight of 0.3% of the mixture, and put 600 grams of corundum The balls are vacuumed to make the vacuum degree less than 1 Pa, and argon gas is introduced, and ball milling is carried out at 1000 rpm for 30 hours. The powder after ball milling was determined to be Al 4 SiC 4 , with a purity of more than 86%, and does not contain Al 3 C 4 Mutually.

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Abstract

The invention belongs to the technical fields of ceramic and fireproof material, providing a method used for preparing Al4SiC4 powder. The method comprises the specific processes as follows: metal Al powder, Si powder, carbon black or graphite are taken as raw materials; the metal Al powder, Si powder and carbon black or graphite are uniformly mixed according to the molar ratio of 4:1:4.2-4.5; the mixture of the metal Al powder, Si powder and carbon black or graphite is arranged in the ball-grinding tank of a high-energy ball-grinder where aluminum stearate used as a dispersant is added; the ball material ratio is 10-15:1; the ball-grinding is carried out for 20-40 hours under a vacuum argon state, the rotation speed is 800-1000r / min; therefore, the Al4SiC4 powder is gained. The method has simple preparation process, stable process parameter, easy controlling, high ball-grinding efficiency and complete raw material reaction, and can prepare the high-purity powder containing no Al3C4 phase.

Description

technical field [0001] The present invention relates to the synthetic method of pottery, refractory material, be specifically related to a kind of Al 4 SiC 4 Powder preparation method. Background technique [0002] Al 4 SiC 4 The powder has a high melting point (about 2037°C), lower density (3.03g / cm 3 ), good thermal conductivity and corrosion resistance of high temperature melt and slag, and Al 4 SiC 4 When the material is oxidized at high temperature, a protective layer of mullite and corundum is formed on the surface of the material, so its oxidation resistance is good, and it has a good application prospect in functional refractory materials such as skateboards and nozzles. Materials workers in Japan and the UK have used Al 4 SiC 4 Excellent oxidation resistance, achieved good results in carbon-containing refractory materials. However, since Al 4 SiC 4 Powder synthesis is difficult, and Al 4 SiC 4 Synthetic reports are very limited. At present, Al is gener...

Claims

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Application Information

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IPC IPC(8): C01B31/30C04B35/56C04B35/66
Inventor 王刚王来稳周继伟周军王龙庆李代兵
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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