利用Al氧化反应修复陶瓷宏观裂纹  

Ceramic Macroscopic Crack Repaired by Al Oxiding Reaction

作　　者：门荣磊[1] 刘家臣[1] 何欣[1] 张君娣[1] 冯春雨[1] 

机构地区：[1]天津大学先进陶瓷与加工技术教育部重点实验室,天津300072

出　　处：《稀有金属材料与工程》2007年第A02期474-476,共3页Rare Metal Materials and Engineering

基　　金：国家高技术研究发展计划(863计划)(2006AA03Z540)资助

摘　　要：基于金属Al在高温下氧化形成氧化铝并伴随体积膨胀的效应,利用该体积膨胀抵消烧结致密化导致的体积收缩,设计了Al、Al_2O_3为主要组成、少量的Y_2O_3和SiO_2为烧结助剂的填充相组分,以95氧化铝方形小坩埚模拟陶瓷宏观裂纹,进行了陶瓷宏观裂纹的修复研究。通过比较Al含量、烧成温度和升温制度对填充组分膨胀量和修复界面微观结构的影响,证实氧化物陶瓷宏观裂纹可通过选择适宜的Al/Al_2O_3填充组分实现修复。Based on aluminum oxidated to be alumina at elevated temperature with volume expansion to balance sintering shrinkage of ceramic, a filling composites was designed to repair oxide ceramic macroscopic cracks which was imitated by a small 95 Al2O3 crucible. The filling composites consist of Al, Al2O3 as main components and Y2O3 and SiO2 as the sintering assistant. The effects of Al content, sintering temperature and schedule on volume expansion and repairing quality related to interfacial microstructure were investigated. It was illustrated that oxide ceramic macroscopic cracks could be better repaired by an adapted Al/Al2O3-based filling composites.

关 键 词：氧化 膨胀 陶瓷 裂纹 

分 类 号：TF124.5[冶金工程—粉末冶金]