Electroerosion Series of Metals for Electric Spark Deposition Based on Solution of the Heat-Conduction Problem

Abstract

Electrical erosion has been experimentally determined for Zn, Al, Zr, Ti, V, Fe, Ni, Co, Cr, Nb, Mo, Cu, and W. A mixture of granules made of the above metals, taken in equal molar ratios, has been used for the first time as a nonlocalized electrode for electric spark deposition of steel 35. A mathematical model for calculating the volume of molten metals under electric discharge conditions during electric spark deposition is proposed based on solving the problem of the thermal field on electrodes using their thermophysical constants. It is shown that the active heat source upon a discharge is an order of magnitude narrower than the erosion zone and three orders of magnitude more powerful than it has been assumed previously. The melt volumes on metals per discharge are calculated and the corresponding series of the electrical erosion resistance of the metals under study is constructed. It is shown that the developed theoretical series of the electrical erosion resistance of metals is in better agreement with the experimental data as compared to the data in the liter-ature.