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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
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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.
出处 《硅酸盐学报》 EI CAS CSCD 北大核心 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~~
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 β-sialon corundum silicon carbide bauxite composite bending creep creep activity energy
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