氧化锌非线性电阻片隐性开裂分析  

Analysis on Recessive Cracking of ZnO Nonlinear Varistor

作　　者：张文刚 罗剑 蒙晓记 胡小定 韩锦晖 谢清云 ZHANG Wengang;LUO Jian;MENG Xiaoji;HU Xiaoding;HAN Jinghui;XIE Qingyun(Xi’an XD Arrester Co.,Ltd.,Xi’an 710200,China)

机构地区：[1]西电避雷器有限责任公司,西安710200

出　　处：《电瓷避雷器》2022年第3期154-158,共5页Insulators and Surge Arresters

摘　　要：针对氧化锌非线性电阻片制造过程中隐性开裂的问题,采用金相显微镜等方法,对开裂断面的显微结构形貌、受力方式进行分析验证,探究了塑性开裂和脆性开裂两种隐性开裂的机理以及隐性开裂发生的时段。结果表明,氧化锌非线性电阻片发生隐性开裂的主要形式是在排结合剂之后发生的脆性开裂,这种开裂方式是在受力磕碰后,早期表现为非常隐蔽的微裂纹,后经高温烧结裂纹进一步扩展,最后受磨片剪切应力后开裂显现的一种失效模式。The metallographic microscope were performed to investigate the microstructure characteristic and loading mode of the problem of recessive cracking in the manufacturing process of ZnO nonlinear varistor. The mechanism of plastic cracking and brittle cracking and the time of recessive cracking were investigated. The result show that the main form of recessive cracking of ZnO nonlinear varistor is brittle cracking after the binder removed. This cracking mode is a kind of failure mode in which the crack initiation as a very hidden micro-crack in the early stage after being subjected to knock against, then the crack is further expanded by high temperature sintering, and finally the crack appears after being subjected to shear stress of the grinding.

关 键 词：非线性电阻片 隐性开裂 断口形貌 排结合剂 

分 类 号：TM862[电气工程—高电压与绝缘技术] TM54