发电机定子导线断裂失效分析  

FALIURE ANALYSIS OF Cu WIRE FOR GENERATOR STATOR

作　　者：于力[1] 郑福民 刘政 

机构地区：[1]中国科学院金属腐蚀与防护研究所金属腐蚀与防护国家重点实验室,沈阳110015 [2]东北电力科学研究院,沈阳110006

出　　处：《腐蚀科学与防护技术》2000年第5期308-310,307,共4页Corrosion Science and Protection Technology

摘　　要：对断裂失效发电机定子进行分析 ,结果表明由于紫铜导线形变加工后退火再结晶组织不完全 ,在受拉应力形变最大处存在微裂纹形核的可能性 ,致使在长期运行中 ,空气中的O2 不断由此扩散到导线内部与Cu形成Cu2 O ,同时环境中所含的H2 和CO等还原性气体不断将形成的Cu2 O还原成Cu ,并释放出H2 O和CO2 ,产生沿晶裂纹 ,最终导致该导线断裂 .The source of fracture failure of the Cu wire used in generator stator has been analyzed. The results show that since full recrystallization structure of Cu has not been obtained by annealing after deformation so some micro\|cracks may be nuclear. Hence O 2 in the air may diffuse through along the micro\|cracks and form Cu 2O with Cu, then Cu 2O are reduced to Cu by H 2 and CO, meanwhile relax H 2O and CO 2 along grain boundary or micro\|cracks, results in intergranular cracks and cracks elongating. Finally the precautionary measures have been suggested.

关 键 词：发电机定子 失效分析 紫铜导线 断裂 发电厂 

分 类 号：TM621.3[电气工程—电力系统及自动化]