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Research demonstrates improved surface hardness and durability in molybdenum through electrical discharge machining, suggesting effective coating methods.
Electrical discharge machining of molybdenum surfaces used to increase hardness, heat resistance and corrosion resistance of machine parts, units and assemblies has been studied. It has been found that electrical discharge machining of molybdenum surfaces allows obtaining durable functional coatings of parts by using high-voltage electric arc in hydrogen atmosphere at a pressure of 0.1 MPa and fixed gap between anode made of graphite and processed surface of the part, cathode, at a rigid current-voltage characteristic of pulsed current source with voltage of 2000 V. The pulse duty cycle has been varied depending on required roughness of the molybdenum carbide MoC coating. Depending on the supplied power two carbide phases in different percentage ratio α-MoC:β-MoC were formed on the surface.
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D.N. Borisenko (2025) studied this question.
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