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It is a well-known fact that alloys of Ag—Cu—Zn—Sn system are a good basis for development of cadmium-free brazing filler metals (BFM) for brazing of different materials. However, as it follows from works of different authors, the BFM of this system are insufficiently active in brazing of hard-alloy materials. This work tries to eliminate these disadvantages. Effect of nickel and manganese alloying in 1—4 wt.% Ni and 2—6 wt.% Mn interval is investigated using method of experiment planning. Investigated are the intervals of alloy melting, areas of spreading and wetting angles on different substrates, strength characteristics of the joints in brazing of stainless steels and hard alloys. Structure of pilot alloys is investigated using the methods of optical and electron microscopy and microX-ray spectrum analysis. It is shown that manganese and nickel alloying of Ag—Cu—Zn—Sn system alloys allowed developing BFM, which provide good wetting of hard-alloy materials at the level of BFM of Ag—Cu—Zn—Cd system at filler relationship, approximately, 1.5—2.0 Mn:1.0 Ni. Technological properties of BFM deteriorate at 1.0 Mn:1.5—2.0 Ni relationship. Development of environmentally friendly BFM of Ag—Cu—Zn—Sn—Ni—Mn system for brazing of rock destruction and metal-cutting tool allows refusing from application of harmful BFM of Ag—Cu—Zn—Cd system and significantly (per 20—50 %) increasing strength of brazed joints. 5 Ref., 4 Tables, 7 Figures.

Effect of nickel and manganese on structure of Ag-Cu-Zn-Sn system alloys and strength of brazed joints