Conclusions
It has been established that the erosion rate of P/M Ag-Ni composite contacts between which arc discharges of 25-A current amplitude are excited is related to their composition. It is shown that materials with a nickel content of 50–75% possess adequate erosion resistance, and are not inferior in this respect to the industrial SN-30 and SN-40 alloys (sintered Ag-30% Ni and Ag-40% Ni materials). It has been found that the erosion of Ag-Ni composite anodes depends on the thermophysical properties of cathodes made of metals or composites of various kinds. It is demonstrated that certain characteristic features of Δm vs composition curves can be satisfactorily explained in the light of the theory postulating that an arc discharge “locks” itself to the least conducting phase and of the relationship between the energetic parameters of jets of eroded mass and and the thermophysical properties of electrodes. The study has also revealed that dissimilar pairs composed of Ag cathodes and Ag-Ni anodes containing up to 60% of nickel are comparable in wear resistance to pure silver contacts; use of such pairs, after they have proved their merits in practical tests, will result in a significant saving in silver consumption.
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Translated from Poroshkovaya Metallurgiya, No. 6(234), pp. 61–66, June, 1982.
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Pravoverov, N.L., Duksina, A.G. & Duksin, Y.I. Electrical erosion of P/M composites of the silver-nickel system. Powder Metall Met Ceram 21, 475–479 (1982). https://doi.org/10.1007/BF00801759
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DOI: https://doi.org/10.1007/BF00801759