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The article presents observations of the microstructure of stainless steel and cemented carbides brazed with the sandwich alloy Ag-Cu-Zn-Mn-Ni with a copper core in a 1 : 2 : 1 ratio. The filler metal consisted of 10 % less silver and 10 % more copper than the silver-based alloy Ag449 (BAg-22 acc. to the ANSI AWS A5.8 standard). The brazing process was carried out using a brazing torch with the fluoride-chloride flux. As a result, the filler metal successfully wetted both materials and led to a dense connection. A phase analysis was performed. The observations of the micro-areas of the steel, sandwich alloy and cemented carbides were made using energy-dispersive X-ray spectroscopy, wavelength-dispersive X-ray spectroscopy, electron backscatter diffraction and transmission electron microscopy. Microstructural studies were designed to evaluate the brazed joint. The microstructure of the joint was mainly composed of a AgZn solid solution and CuZn-based solid solution. Distributions of the elements in the joining area between the brazing filler metal and cemented carbides showed a higher content of nickel in the brazing area and a lower silver content, approximately 6 % for both alloys. It is noteworthy to mention that there was a cobalt diffusion inside the brazing filler metal. Detailed studies of the chemical composition indicate that the elements with a noticeable diffusion in steel were silver and zinc.

Microstructure of a joint of sintered carbides and steel brazed with Ag-Cu-Zn-Mn-Ni filler metal