铝制冷却器真空钎焊接头界面结构及断口分析  

Interface Structure and Fracture Analysis of Aluminum Cooler Vacuum Brazing Joint

作　　者：许敬年 曹秀丽[2] 冯涛 

机构地区：[1]中国石油大学机电学院材料系,山东青岛266555 [2]中国石油大学出版社,山东青岛266555

出　　处：《焊管》2012年第9期21-24,共4页Welded Pipe and Tube

基　　金：山东省优秀中青年科学家科研奖励基金(BS2010ZZ013);中央高校基本科研业务费专项资金资助(11CX04038A)

摘　　要：采用真空钎焊技术研制了一种用于高级轿车的铝制冷却器。采用LT-3铝复合板材进行了焊接试验,分析了钎焊接头的组织,并对所试制的铝制板翅式冷却器进行了水压试验及其断口分析。结果表明,钎焊接头中生成了网状共晶组织,接头中生成了金属间化合物。焊接完成的板翅式冷却器水压试验压力可达到15 kg/cm2以上,钎焊接头断口属于混合断裂,断口表面分布有二次裂纹、韧窝、解理面、沿晶断裂等断裂特征。A kind of aluminum cooler used for advanced ear by adopting vacuum brazing technology was developed. Welding test was conducted by Utilizing LT-3 almninum composite plate. The structure of brazing joint was analyzed, and hydrostatic＇ test and fracture analysis on fin type cooler of trial produced aluminum composite plate were carried out. The results showed that there are some reticular eutectic strnctures and intermetallic compound in the brazing joint. The hydrostatic test pressure of fine type cooler can reach more than 15 kg/cm2, the fracture type of the brazing joint is mixed fracture, and secondary cracks, dimples, cleavage planes and intergranular fracture etc. distribute on the surface of the fracture.

关 键 词：LT-3铝复合板 真空钎焊 水压试验 断口 断裂机制 

分 类 号：TG407[金属学及工艺—焊接]