PRODUCING HEAT-RESISTANT METAL-CERAMIC COATINGS BASED ON TITANIUM SILICIDE AND NITRIDE BY THERMOREACTIVE ELECTROSPARK STRENGTHENING

摘要

Coatings based on titanium silicide Ti_5Si_3 are produced by thermoreactive electrospark strengthening (TRESS). In this process, an electrothermal layer of specified composition (Ti-Si, Ti-Si_3N_4) is applied to a substrate, with subsequent chemical transformation sustained by the discharge-pulse energy. The structure, composition, and properties (microhardness, thickness, continuity, and wear resistance) of TRESS coatings on OT4-1 titanium alloy are investigated. The dependence of the depth of chemical transformation in the applied layers on the energy of treatment is determined. It is found that coatings obtained in optimal conditions (E = 0.3 J) are able to increase the microhardness, wear resistance, and thermal stability of OT4-1 alloy.