title: Effect of ultrasonic transmission rate on microstructure and properties of the ultrasonic-assisted brazing of Cu to alumina.
abstract: Fluxless brazing of bare alumina with Cu was conducted with an ultrasonic-assisted brazing technique by a Zn-14wt.%Al filler. The shear strength of Cu/alumina joints (84MPa) exhibited 27% larger than the alumina/Cu joints (66MPa) due to different intermetallic phases and their morphologies formed in the seam under the same parameters, which are probably attributed to the transmission rate of ultrasonic energy varying with density of the ultrasonic horn-contacted materials. Overgrowth of stalactite-like CuZn5contributes to better thermal dissipation of the ultrasonic-assisted brazed Cu/alumina joints.
authors: State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, 92, Xidazhi Street, Nangang, Harbin 150001, PR China; State Key Laboratory of Advanced Welding and Joining, Shenzhen Graduate School, Harbin Institute of Technology, HIT Campus, Shenzhen University Town, Xili, Nanshan, Shenzhen 518055, PR China. Electronic address: jhj7005@hit.edu.cn.
authors: Hongjun
authors: H
authors: Ji
authors: State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, 92, Xidazhi Street, Nangang, Harbin 150001, PR China.
authors: Hao
authors: H
authors: Chen
authors: State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, 92, Xidazhi Street, Nangang, Harbin 150001, PR China; State Key Laboratory of Advanced Welding and Joining, Shenzhen Graduate School, Harbin Institute of Technology, HIT Campus, Shenzhen University Town, Xili, Nanshan, Shenzhen 518055, PR China. Electronic address: myli@hit.edu.cn.
authors: Mingyu
authors: M
authors: Li
keywords: Ceramics; Heat dissipation; Microstructure; Shear strength; Ultrasonic brazing