弱粘结煤的高温结构变化及其对合成SiC的影响

INVESTIGATION ON STRUCTURE OF WEAKLY CAKING COAL AT HIGH TEMPERATURE AND INFLUENCE ON SYNTHESIZING SiC

用弱粘结煤与石英砂以Acheson工艺合成了SiC ,用SEM研究了弱粘结煤高温焦炭的孔隙结构 ,并对弱粘结煤 80 0℃～ 1 60 0℃的焦炭进行了X射线衍射分析 ,计算了各温度下的微晶结构参数。研究表明 ,弱粘结煤高温焦炭孔隙率、长径比和表面积大 ,反应性好 ,可为SiC快速、大范围生长提供有利条件。微晶活化温度范围也和SiC的最佳合成温度范围基本一致。

WT4”BZ]SiC was prepared by weakly caking coal and quartzite by Acheson process High-temperature coke from weakly caking coal was investigated by SEM Coke prepared at temperature ranging from 800 to 1600℃ was studied by X-Ray and its micro-crystalline parameter was calculated It shows that the high temperature coke of weakly caking coal has high porosity, large slenderness ratio and specific surface area These entitle it a good activation and provide a favorable condition for SiC quick growth in large region Activation temperature of micro-crystalline is consistent in the optimum temperature of SiC synthesis approximately [WT4”HZ]