含碳添加剂Al_2O_3基陶瓷复合材料的增韧机理  

Toughening Mechanisms of Al_2O_3/TiC Ceramic Composite with Carbon Additive

作　　者：许崇海[1] 黄传真[2] 李兆前[3] 艾兴[2] 

机构地区：[1]山东轻工业学院机电工程系,济南250100 [2]山东大学机械工程学院,济南250061 [3]山东省经济贸易委员会,济南250011

出　　处：《无机材料学报》2001年第2期256-262,共7页Journal of Inorganic Materials

基　　金：国家教委优秀青年教师基金;山东省科委资助课题

摘　　要：以碳为添加剂，利用热压工艺制得的 Ａ１２Ｏ３／ＴｉＣ新型陶瓷复合材料，其断裂韧性比相应不合碳的Ａｌ２Ｏ３／ＴｉＣ陶瓷材料提高约２０％.理论与实验分析表明：弱界面是获得高韧性陶瓷复合材料的一个有效途径．以石墨形态存在的碳在材料中不但能导致自发微裂纹的产生，而且还能形成弱界面，并在强弱界面的共同作用下以裂纹桥联、裂纹分支与裂纹偏转等多种增韧机制及其协同作用共同提高Ａ１２Ｏ３／ＴｉＣ陶瓷材料的断裂韧性．With carbon as an additive, the fracture toughness of Al2O3/TiC ceramic material fabricated by hot pressing technology is increased by 20% than that of Al2O3/TiC composite without any carbon added. The results of theoretical and experimental analyses show that the existing of weak interfaces in the ceramic material is one of the effective approaches to achieve higher fracture toughness. The added carbon, existing as a form of graphite, can result in not only the formation of spontaneous microcracks but also the formation of weak interfaces. As a result of the comprehensive integration and synergism of varieties of single toughening mechanisms such as crack bridging, crack branching and crack defection etc., the fracture toughness of Al2O3/TiC ceramic material can be enhanced obviously.

关 键 词：陶瓷材料 氧化铝 碳 添加剂 增韧机理 复合材料 

分 类 号：TQ174.78[化学工程—陶瓷工业] TB332[化学工程—硅酸盐工业]