Theory and technique of manufacture of electrode-tool materials for electroerosion machining
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In the electrospark machining of carbides of the transition metals, the character and extent of their erosion depend on the form and energy of the discharge pulses and also on the nature and relative strengths of the Me-C and Me-Me chemical bonds. With increase in electrical pulse energy, the explosive action on the electrodes becomes more intense, as a result of which the carbides suffer greater attack through melting, evaporation, and mechanical disruption.
The nature and relative strengths of the chemical bonds in the carbide lattices determine which mechanism of erosion predominates in the process. With strong Me-C bonds, characteristic of the Group IV metal carbides, electroerosion is mainly due to a mechanism of brittle mechanical disintegration. In the Group V metal carbides, this mechanism is less pronounced, and there is a corresponding increase in erosion due to evaporation and melting. The evaporation and melting mechanism is chiefly responsible for the erosion of the Group VI metal carbides.
In the ion bombardment of carbides of the transition metals in a glow discharge, where explosive and hydrodynamic actions are largely suppressed, no cleavage-type mechanical disruption is observed, and the erosion resistance of the carbides depends on their electronic structure and energetic state. Thus, with increase in the SWASC sp3, the erosion resistance of carbides of the transition metals grows.
KeywordsCarbide Explosive Erosion Resistance Mechanical Disruption Metal Carbide
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