氧化物共晶陶瓷定向凝固研究进展  

Research Progress in Directionally Solidified Oxide Eutectic Ceramics

作　　者：张军[1] 刘林[1] 苏海军[1] 傅恒志[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072

出　　处：《中国材料进展》2010年第7期10-19,41,共11页Materials China

基　　金：国家自然科学基金资助项目(50772090);西北工业大学基础研究基金资助项目(NPU-FFR-W018101);新金属材料国家重点实验室开放课题资助项目(2007AMM004);航空科学基金资助项目(04G53048);高等教育博士点基金资助项目(20040699035)

摘　　要：定向凝固氧化物共晶自生复合陶瓷具有优异的高温强度、抗氧化性、抗蠕变性以及良好的高温结构稳定性,被认为是新一代在高温氧化性气氛中长期工作的首选超高温结构材料之一。回顾了氧化物共晶自生复合陶瓷的发展历史,总结了目前定向凝固氧化物共晶陶瓷凝固组织和力学性能方面的研究现状,同时结合作者在本领域的研究,着重分析了高温度梯度定向凝固条件下氧化铝基共晶陶瓷的组织特征、凝固特性、力学性能以及增韧机制。最后展望了定向凝固氧化物共晶陶瓷的发展趋势。Directionally solidified oxide eutectic in situ composite ceramics present excellent high-temperature strength, superior oxidation and creep resistance, as well as outstanding mierostructural stability at elevated temperatures, thus these materials are considered as ones of the most promising candidates for new generations of ultra-high-temperature struc-tural materials used at high-temperature oxidizing atmosphere over a long period of time. This paper reviews the development history of oxide eutectic in situ composite ceramics, and systematically summarizes the current research status of solidification microstructure and mechanical properties of directionally solidified oxide eutectic ceramics. Furthermore, we analysis the solidification microstructure, mechanical properties and toughening mechanism of selected alumina-based eutectie ceramics prepared under high thermal directional solidification with author＇s research features in this field. Finally, we discussed their possible development trends in future.

关 键 词：氧化物陶瓷 定向凝固 微观结构 机械特性 

分 类 号：TG244[金属学及工艺—铸造]