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Wettability of Au-Ag-Si Brazing Filler Metal Series with Ni
Keywords: Brazing, Wettability, Au-Ag-Si
Analyzed the phase diagram, three kinds of Au-Ag-Si brazing filler metal with different constituent was prepared by using the vacuum melting method in a medium-frequency induction furnace. The spreading-out experiment of the Au-Ag-Si brazing filler metal on Ni sheet was done at 20桢40桢60 above its liquidus temperature respectively with flow H2 as protective gas. The wettability of the Au-Ag-Si brazing filler metal with Ni was studied by measuring and analyzing the area-of-spread and wetting angle .The interface structure of the brazing filler metal with Ni after its spreading was observed by backscattered electron images. The results show that the Au-Ag-Si brazing filler metal series have a good wettability with Ni When brazing temperature increases , the area-of-spread increases and the wetting angle decreases; there are wetting rings after its wetting on the Ni , energy spectrum analysing results indicate that the wetting rings are principlely consisted of Au element ; there has formed the intermetallic of Ni3Si at the interface , the formation of Ni3Si can better the brazed joint strength in a degree.
Guosheng Jiang, Professor and General Manager
Central South University
Changsha, Hunan 410083,

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