Abstract
1. During the electrospark processing of cermets based on chromium carbide, the surface layer is impoverished with respect to the more fusible metallic bond. The degree of such impoverishment is determined by the process cycle and the composition of the interelectrode medium. 2. With certain process cycles (Imean ≥ 5 A for generator VG-3V and Imean ≥ 3 A for generator MGI-2) the surface layer develops microcracks which reduce the strength of the material being processed. 3. For electroerosion defect-less processing of material based on chromium carbide it is desirable to use short impulses and low energy values. It is possible to recommend a lamp generator of the type GIT-1m, GIT-2 (or the similar GIL, VChIU, VGI) for the energy sources needed to process the cermet under review, with impulse energies of not more than 0.04 J, and also generator VG-3V with a current of up to 2 A. Vibrating or rotating one of the electrodes pumping liquid through the electrode gap is essential. 4. It is desirable when processing cermets with generators of the type GIT to use industrial water as the interelectrode medium; this substantially improves the quality of the surface layer with a slight reduction in process rate.
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