钴包覆纳米Al_2O_3/TiC_p复相陶瓷的力学性能及其增韧机制  

Mechanical Properties and Toughening Mechanism of Cobalt-coated Al_2O_3/TiC_p Composites

作　　者：师瑞霞[1] 尹衍升 周春华[2] 李嘉[1] 马来鹏[2] 

机构地区：[1]济南大学材料科学与工程学院,山东济南250022 [2]山东大学材料液态结构及其遗传性教育部重点实验室山东省工程陶瓷重点实验室,山东济南250061

出　　处：《机械工程材料》2004年第11期28-31,共4页Materials For Mechanical Engineering

基　　金：国家"863"计划资助项目(2002AA332100)

摘　　要：利用钴包覆的纳米Al2O3和TiC粉料采用热压烧结法制备了抗弯强度为782MPa、断裂韧度为7.81MPa·m1/2的复相陶瓷材料,并建立了该种材料的显微结构示意图,从界面的角度分析了力学性能提高的原因。观察材料的断口形貌发现形成了晶内型结构,并观察到了裂纹的扩展路径以及裂纹的分叉、偏转、桥联等现象。The mixture of Co-coated Al_2O_3 and TiC nano-powder was hot-pressed into an Al_2O_3-TiC-Co composite. The flexural strength and fracture toughness of the composite are 782±60MPa and 7.81±0.80MPa·m^(1/2), respectively. The microstructure schematic illustration of the composite was proposed , and the reasons why mechanical properties were improved were analyzed from interface aspect. It was found that inner-crystalline structure was formed, and the tortuous routes of crack propagation and the branching, deflecting and bridging were also observed on the fracture surface.

关 键 词：复相陶瓷 钴包覆 Al2O3 增韧机制 

分 类 号：TB383[一般工业技术—材料科学与工程]