Relationship between Erosion and Mechanical Characteristics of Fine-Grained Hard Alloy WC - 16 percent Co Obtained by Solid-Phase and Liquid-Phase Consolidation. I. Erosion Resistance

摘要

We have studied the erosion characteristics of hard alloys under electrospark alloying conditions, and the relationship of such characteristics with the physical and mechanical properties. WC - 16 percent Co alloys were obtained by conventional sintering under vacuum in the temperature range 950-1350 deg C, and by sintering followed by high-energy pressure treatment at the same temperatures. We have shown that the erosion resistance depends ambiguously on the porosity and bending strength but is quite clearly connected with the crack resistance and the electrical resistivity which in turn is determined by the quality of the interphase and intergrain boundaries. We have refined the structural dependence of the erosion resistance of hard-alloy electrodes. This dependence is manifested to the same extent as the structural dependence of the electrical resistance.