Effects of Heat-treatment Temperature on the Properties of Negative CTE Eucryptite Ceramics

摘要：

　　In this paper,negative thermal expansion coefficient eucryptite powders were prepared by sol-gel method using silica-sol as starting material.The raw blocks were obtained by dry pressing process after the powder was synthesized,and then the raw blocks were heat-treated at 600°,1150°,1280°,1380°,1420° and 1450℃,respectively.Variations of density,porosity and thermal expansion coefficient at different heat treatment temperatures were investigated.Phase transformation and fracture surface morphology of eucryptite heat-treated at different temperatures,respectively,were observed by XRD and SEM.The results indicate that,with the increasing heat-treatment temperature,the grain size and the bending strength increased,porosity decreased,thermal expansion coefficient decreased continuously.Negative thermal expansion coefficient of-5.3162 × 10-6~-7.4413 × 10-6 (0~800℃) was obtained.But when the heat-treatment temperature was more than 1420℃,porosity began to increase,bending strength began to decrease,which were the symbols of over-burning,while the main crystal phase didnt change.

关键词： Eucryptite Heat-treatment temperature Thermal expansion Coefficient

作者: Yong Li Qihong Wei Ling Li Chonghai Wang Xiaoli Zhang Fang Gao

作者单位: Shandong Research and Design Institute of Industrial Ceramic, Zibo 255031, China;Wuhan University of Shandong Research and Design Institute of Industrial Ceramic, Zibo 255031, China Shandong University of Technology, Zibo 255049, China

会议类型: 国际会议

会议名称: The Sixth China International Conference on High-Performance Ceramics(第六届中国先进陶瓷国际研讨会(CICC-6))

会议地点: 哈尔滨

会议语种:英文

页码: 123-125

在线出版日期: 2009-08-16（万方平台首次上网日期，不代表论文的发表时间）