高温钎焊紫铜管脆断原因分析  

Analysing the Cause of Brittle Fracture of Oxygen-free Copper Pipe Brazed at High Temperature

作　　者：钱红[1] 李西恭[1] 王增宏 

机构地区：[1]北京工业大学金属材料科学与工程学系,北京电冰箱压缩机厂

出　　处：《北京工业大学学报》1994年第3期85-90,共6页Journal of Beijing University of Technology

摘　　要：针对北京电冰箱压缩机厂压缩机机壳与紫铜排气管钎焊接头紫铜管脆断失效问题，通过对紫铜原材料进行化学分析和高温氧化脆性分析，对脆断管的断口表面进行宏观分析和微观扫描电镜分析及能谱微区成分分析，发现紫铜管脆断的主要原因是由于钎焊过程中紫铜管氧化并吸收氢造成氢脆产生的，本文还讨论了影响钎焊铜管脆化的因素和影响接头质量的其它因素，提出了钎焊工艺参数控制方面的建议。Brittle fractures appearing at the brazing joint of the compressor shell of a refrigerator and the oxygen-free copper gas drainage pipe have been studied. The main causes of the brittle fractures are investigated by: analysing the elements of the raw materials and the brittleness caused by high temperature oxidization, visually observing the fractured surfaces of the copper pipe; and, examining the microscopic appearance and the microscopic elemental composition of fractured surfaces using SEM and EDXA respectively. The experiments indicate that the main causes of brittle fractures are the oxidization of oxygen-free copper pipe, the absorption of hydrogen during the brazing process, which results in hydrogen brittleness. The factors which might affect the brittleness and other performance criteria of the copper brazing joint are also discussed in this paper. In addition, suggestions about parameter control are put forth.

关 键 词：紫铜 钎焊 脆断 压缩机 排气管 

分 类 号：TB652[一般工业技术—制冷工程]