Abnormal thermal shock behavior in electrical conductivity of Ti2SnC

作     者：Linquan Zhang Shibo Li Xiaodong Chen Yang Zhou 

作者机构：Center of Materials Science and Engineering School of Mechanical and Electronic Control EngineeringBeijing Jiaotong University 

出 版 物：《Progress in Natural Science:Materials International》 (自然科学进展·国际材料(英文))

年 卷 期：2017年第27卷第4期

页      面：527-530页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 070301[理学-无机化学] 

基　　金：supported by the National Natural Science Foundation of China under Grant nos. 51372015 and 51472024 Beijing Government Funds for the Constructive Project of Central Universities 

主　　题：Ti2SnC Abnormal thermal shock behavior Recovery Mechanism Crack healing 

摘      要：Some ternary carbide and nitride ceramics have been demonstrated to exhibit abnormal thermal shock behavior in mechanical properties. However, the influence of thermal shock on other properties is not clear. This work reports on the influence of thermal shock on electrical conductivity of Ti2SnC as a representative member of ternary carbides. Abnormal change in electrical conductivity was first demonstrated during quenching Ti2SnC in water at 500-800 ℃. The residual electrical conductivity of the quenched Ti2SnC gradually decreased with increasing temperature, but abnormally increased after quenching at 600 ℃. The microstructure of surface cracks was characterized. The main mechanism for the abnormal electrical conductivity recovery is that some narrow branching cracks are filled by metallic Sn precipitating from Ti2SnC.