Process of new phosphorus-containing brazing-alloy nickel-based wetting surface of 304 stainless steel

An investigation about process of XHBNi-5 wetting on the surface of 304 stainless steel was carried on. By scanning electric microscope (SEM) and energy dispersive spectrometer (EDS), the microstructure and characteristics of brazing-alloy solidifying on the 304 stainless steel surface was analysed. The results show that, the steady-state low-melting-point Ni-P compounds and Ni-Cr-P phase precipitates first when XHBNi-5 brazing-alloy heated temperature increases to the solder solidus temperature. As the temperature increases, the precipitation increases and forms the wetting ring by spreading first. The brazing-alloy spreads on the basic of the wetting ring. The interdiffusion behavior of Ni, Cr in the brazing-alloy and Fe in the stainless-steel occurred on the process of the brazing-alloy spreading, and the extent of the interdiffusion behavior was more strong by the temperature increased. There is non-P phase exiting on the interface of the structure by the brazing-alloy spreading. The P-phase mainly exited on the superficial coat of the structure. P and Fe are not inclined to forming a continuous compound layer.