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首页> 外文会议>The 3rd International Symposium on Material Chemistry in Nuclear Environment (Material Chemistry '02 MC'02) Mar 13-15, 2002 Tsukuba >SINTERING AND POLYTYPE TRANSFORMATION OF SiC BYAlB_2 ADDITION
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SINTERING AND POLYTYPE TRANSFORMATION OF SiC BYAlB_2 ADDITION

机译：AlB_2添加SiC的烧结与多相转变。

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摘要

In order to develop the industrial process for SiC materials in the nuclear environment, the sintering behaviors of SiC powders were investigated. α(6H)- and β(3C)-SiC powders were sintered with AlB_2 and C additives. a-SiC powder could be sintered to almost full density at 1900℃. This temperature is 250℃ lower than that by the conventional sintering method that uses B and C additives. Al atoms solved form the additive into SiC grains and stabilized 4H polytype, which caused transformation of 6H to 4H. It was also observed that anisotropic grain growth occurred and fracture toughness of the sintered SiC increased with the aspect ratio of grains. β-SiC powder needed slightly higher temperature than α-SiC powder to complete sintering. ?-SiC transformed from 3C to 6H and 4H and exhibited exaggerated grain growth.
机译：为了发展核环境下SiC材料的工业生产工艺，研究了SiC粉的烧结行为。用AlB_2和C添加剂烧结α（6H）-和β（3C）-SiC粉末。 α-SiC粉末可在1900℃下烧结至几乎全密度。该温度比使用B和C添加剂的常规烧结方法的温度低250℃。溶解的铝原子将添加剂形成SiC晶粒并稳定了4H多型性，从而导致6H转变为4H。还观察到，随着晶粒的长径比，发生了各向异性的晶粒生长，并且烧结的SiC的断裂韧性增加。为了完成烧结，β-SiC粉末需要比α-SiC粉末稍高的温度。 γ-SiC从3C转变为6H和4H，并显示出过大的晶粒生长。

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