Microstructure and Properties Analysis of AC Assisted Al/Cu Plasma Arc Brazing Joint by Adding SiO2 Nano-powder
XU Xu1,2,3, LIU Yulong2, SU Zaichun1, FU Ying1,2, HUANG Jiankang2, FAN Ding2
1 Lanzhou LS Testing Technology Co., LTD., Lanzhou 730314, China 2 State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China 3 Lanzhou LS Heavy Equipment Co., Ltd., Lanzhou 730314, China
Abstract: The Al/Cu dissimilar metal joints with good forming and mechanical properties were achieved byAC assisted plasma arc brazing assisted with adding SiO2 nano-powder from the aspects of process improvement and interface control. The microstructure of the interface and the mechanical properties of the joint were analyzed, and the internal mechanism of the interface formation was described. The results show that the introduction of AC assisted arc can significantly improve the wetting and spreading properties of Al on Cu base metal surface, and the effective joint length increases from 12.25 mm to 15.2 mm. The microstructure analysis of the joint shows that nano-SiO2 adsorbs on Cu interface and IMC layer, which acts as diffusion barrier, impedes the reaction and mutual diffusion between Al and Cu atoms, reduces the thickness of IMC interface during welding, and slows down the growth of IMC during isothermal aging. At the same time, due to the larger effective connection length and the inhibition effect on the IMC layer, the joint with AC auxiliary current value of SiO2 nanoparticles added at 45 A bears the maximum fracture load of 0.85 kN, and the fracture is located in the heat-affected zone on the aluminum side, and the mechanical properties of the joint are good.
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2023, Vol. 37 
