Al/Zn-3Al/Al超声波辅助钎焊接头焊合率及显微组织  

Bonding ratio and microstructure of Al/Zn-3Al/Al joint brazed with assistance of ultrasonic waves

作　　者：王玲 肖勇[2] 万超 符永高 

机构地区：[1]中国电器科学研究院有限公司,广州510300 [2]武汉理工大学材料与科学工程学院,武汉430070

出　　处：《焊接学报》2017年第12期90-94,共5页Transactions of The China Welding Institution

基　　金：广州市科技计划项目(20150903004);广东省科技计划项目(2013B090200038)

摘　　要：采用固定间隙超声波辅助无钎剂钎焊方法制备了Al/Zn-3Al/Al钎焊接头,并研究了超声振动时间、超声振动功率以及钎焊温度对接头焊合率和显微组织的影响.结果表明,液相钎料与母材间的冶金结合首先发生在接头的边角处,随着超声振动时间的延长或功率的增加,冶金结合区域逐步向接头的中心蔓延;当超声振动功率高于210 W,超声振动时间长于2 s时,接头能获得优良的焊合率;接头的钎缝层主要由Zn-Al共晶相和α-Al相组成,升高钎焊温度或延长超声振动时间均会增加钎缝层中α-Al相的含量,其机制主要归因于超声空化效应对母材的溶蚀作用.Al/Zn-3 Al/Al joints were fabricated with a gap-confined ultrasound-assisted brazing method. The effects of ultrasonic vibration time,ultrasonic vibration power and brazing temperature on the bonding ratio and microstructure of joint were investigated. The results showed that metallurgic bonding between the liquid filler and base metal firstly occurred at the corner of joint; then the bonding region spread to the center of joint with the increase of ultrasonic vibration power or time. Excellent bonding ratio could be obtained for the joint brazed with ultrasonic vibration power and time higher than 210 W and 2 s,respec-tively. The filler metal layer of joint was mainly composed of ZnAl eutectic phase and α-Al phase,and the content of α-Al phase was improved with the increase of ultrasonic vibration time or brazing temperature,which could be attributed to the induced dissolution effect under ultrasonic cavitation.

关 键 词：铝合金 锌铝钎料 超声波辅助钎焊 焊合率 显微组织 

分 类 号：TG454[金属学及工艺—焊接]