可加工Ce-ZrO_2/CePO_4陶瓷的“塑性化”及其机理  

“Ductility”of Machinable Ce-ZrO_2/CePO_4 Ceramics and Its Mechanism

作　　者：葛志平[1] 刘志锋[1] 刘家臣[1] 王丽娟[1] 

机构地区：[1]天津大学材料科学与工程学院先进陶瓷与加工技术教育部重点实验室,天津300072

出　　处：《天津大学学报（自然科学与工程技术版）》2004年第2期126-129,共4页Journal of Tianjin University：Science and Technology

基　　金：教育部科学技术重点基金资助项目.

摘　　要：针对工程陶瓷材料本征脆性问题,作者从应力 应变曲线、压痕及压痕尖端的裂纹扩展等方面探讨了可加工Ce ZrO2/CePO4材料的"塑性化",并从显微结构入手,研究了使这种材料产生"塑性化"的机理,即除CePO4本身具有一定的台阶和层片状断裂外,主要由于CePO4的引入出现了强弱界面共同存在的网络结构,弱界面可以产生和捕获微观缺陷,耗散主裂纹扩展能量,导致局部的剪切变形,从而赋予陶瓷"塑性".The “ductility”of machinable Ce-ZrO_2/CePO_4 ceramics is discussed from their stress-strain curve, indentation, crack propagation of indentation peak, etc. Through the research of ceramic microstructure, the mechanisms of ceramic “ductility” is studied. The special stepped and multi-layered fracture of CePO_4, toge-(ther) with the network structure of intercalated distributional strong-weak interface forming with the addition of CePO_4 which can yield and capture micro-defect, dissipate energy of primary crack expansion, cause local shear deformation, makes Ce-ZrO_2/CePO_4 ceramics “ductile”.

关 键 词：应力-应变曲线 压痕 塑性化 弱界面 陶瓷 本征脆性 

分 类 号：TQ174.75[化学工程—陶瓷工业]