발간논문

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Vol.32, No.12, 1442 ~ 1450, 1994
Title
The Preparation of SiC Powder by Self - propagating high Temperature Synthesis Process from silica
고석권Seog Kwon Ko, 원창환Chang Whan Won, 천병선Byung Sun Chun, 김흥원Heung Won Kim, 심건주Gun Choo Shim
Abstract
The SiC powder was prepared by a SHS process using SiO₂, Mg and C as raw materials to determine the optimum process variables. The results obtained from this study may be summarized as follows; 1) The mole ratio between C and Mg affected the magnesiothermic reduction reaction most and the highest yield of SiC was obtained at the mole ratio of SiO₂ : Mg : C = 1.0 : 2.5 : 2.2. 2) The propagation speed of combustion reaction was about l0㎜/sec increasing with the decrease of SiO₂ particle size. 3) The amount of unreacted silicon decreased with increasing compaction pressure. 4) Impurities were found to decrease by evaporation during the high temperature reaction or by solution during leaching process. 5) The particle size of prepared SiC powders was in the range of 0.2∼1.0 microns with the purity of about 98.885 weight percent.
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