矾土基β-sialon结合刚玉/碳化硅复合材料的高温弯曲蠕变性能  

HIGH TEMPERATURE BENDING CREEP PROPERTIES OF BAUXITE BASED β-SIALON BONDED CORUNDUM/SiC COMPOSITES

作　　者：韩波[1] 张海军[1] 钟香崇[1] 

机构地区：[1]郑州大学高温功能材料河南省重点试验室,郑州450052

出　　处：《硅酸盐学报》2007年第2期216-219,共4页Journal of The Chinese Ceramic Society

基　　金：河南省重点科技攻关计划(0623022900);河南省杰出青年科学基金(0512002400)资助项目~~

摘　　要：研究了矾土基β-sialon(15%～25%,质量分数)结合刚玉/碳化硅复合材料在1250～1400℃,2～3.5MPa应力下弯曲蠕变性能。结果表明:1250～1400℃间,材料的弯曲蠕变过程可以分为两个阶段:30min以前为减速蠕变阶段,减速指数m在0.5～0.9之间;30min～3h为稳态蠕变阶段,应力指数约为1。稳态蠕变时,蠕变活化能在280～335kJ/mol之间,且减速指数和蠕变活化能均随β-sialon含量的增加而增加,说明β-sialon含量的增加有助于提高复合材料的弯曲蠕变性能。The bending creep properties of bauxite-based β-sialon bonded corundum/SiC composites with 15%-25% β-sialon content （in mass） were studied at 1250-1400 ℃ and under bending stress of 2-3.5 MPa. The results show that the creep process can be divided into two stages： （1） Deceleration creep stage, within 30min; deceleration exponent m=0.5-0.9; （2） Steady-state creep stage, from 30 min to 3 h; stress exponent is close to 1, creep activity energy △H ranges from 280-335 KJ/mol. The m and AH increase with the increasing of β-sialon content （in mass）, which indicates increasing β-sialon content is favorable to improvement of creep resistance.

关 键 词：Β-SIALON 刚玉 碳化硅 矾土 复合材料 弯曲蠕变 蠕变活化能 

分 类 号：TQ175.7[化学工程—硅酸盐工业]