Method for preparing aluminum carbide from aluminum oxide

A technology of alumina and aluminum carbide, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problem of not using mature technology, and achieve the effects of low cost, simple operation and short process flow

Inactive Publication Date: 2012-05-09
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, aluminum carbide is generally prepared by reacting pure alum

Method used

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  • Method for preparing aluminum carbide from aluminum oxide
  • Method for preparing aluminum carbide from aluminum oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A. Take a total of 80g of alumina and graphite according to the mass ratio of industrial pure alumina powder and graphite as 3:1, mix them evenly, and make it under the pressure of 3Mpa 20mm×10mm block;

[0020] B. Put the bulk material obtained in step A under vacuum, maintain the pressure at 50Pa, heat up to 1550°C after 120min, and keep it warm for 60min. After cooling, 41.8g of aluminum carbide is obtained. The purity of aluminum carbide is over 90% according to SEM and EDS analysis .

Embodiment 2

[0022] A. According to the mass ratio of industrial pure alumina powder and graphite as 5:1, take 60g of alumina and graphite, mix them evenly, and make them under the pressure of 8Mpa 20mm×10mm block;

[0023] B. Put the bulk material obtained in step A under vacuum, maintain the pressure at 200Pa, heat up to 1600°C after 60 minutes, and keep it warm for 120 minutes. After cooling, 34.6g of aluminum carbide is obtained, and the purity of aluminum carbide reaches more than 94.57%.

Embodiment 3

[0025] A. Take a total of 80g of alumina and graphite according to the mass ratio of industrial pure alumina powder and graphite as 4:1, mix them evenly, and make them under a pressure of 10Mpa 20mm×10mm block;

[0026] B. Put the bulk material obtained in step A under vacuum, maintain the pressure at 1Pa, heat up to 1450°C after 80 minutes, and keep it warm for 30 minutes. After cooling, 42.6g of aluminum carbide is obtained, and the purity of aluminum carbide reaches more than 92.43%.

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Abstract

The invention relates to a method for preparing aluminum carbide from aluminum oxide, which comprises the steps of: mixing industrial pure aluminum oxide as a raw material with graphite as a reducing agent; then putting the mixture at a pressure of 1-200 Pa; heating the mixture to 1450-1600 DEG C for 60-120 min; then keeping the heat for 30-120 min; and cooling the mixture to obtain the aluminum carbide, wherein purity of the aluminum carbide is more than 90% and up to 96.38%. The method disclosed by the invention is finished in a vacuum environment; the obtained aluminum carbide is pure and free from impurities; and gas generated from reaction is controlled easily. As the aluminum oxide and the graphite carbon are adopted as reactive materials, the reactive materials are obtained easily and low in cost. The method for preparing aluminum carbide from aluminum oxide disclosed by the invention is short in aluminum carbide preparation technological process, clean, free from pollution, as well as simple and convenient in operation.

Description

technical field [0001] The invention relates to a method for preparing aluminum carbide by carbothermal reduction of alumina, in particular to a method for preparing aluminum carbide from alumina, which belongs to the technical field of pyrometallurgy. Background technique [0002] Aluminum carbide is a light yellow-brown, hard, transparent rhombic hexahedral crystal with a melting point of 2100°C. Aluminum carbide is an important compound in the technical field of metal aluminum industry. It is used to reduce metal oxides in the metallurgical industry, used as a chemical reaction catalyst in the chemical industry, and used in the ceramic industry to make aluminum nitride for high temperature, cutting and mold. And advanced ceramic materials such as mechanical parts. In addition, aluminum carbide as an additive can strengthen synthetic materials and alloys (Al-Al 4 C 3 , Al-SiC-Al 4 C 3 , Al-Al 3 Ti-Al 4 C 3 etc.) strength. [0003] At present, aluminum carbide is g...

Claims

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Application Information

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IPC IPC(8): C01B31/30C01B32/914
Inventor 杨斌蒋文龙于文站郁青春戴永年刘大春徐宝强邓勇刘永成周晓奎陈建云李永梅朱富龙李艳
Owner KUNMING UNIV OF SCI & TECH
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