INFLUENCE OF CORED WIRE MELTING MODE AT ARC SPRAYING ON COATING PROPERTIES

ABSTRACT. Jointly analysis of melting model of core wire at arc spraying and form-ing coating structure properties was done. Influence of physicochemical parameters of initial materials and atomization modes as well was established. Basing on investiga-tion results a row of core wires for wear-resistant application was developed. Coatings from such materials are successfully used with reference to parts to be restored in metallurgy, gas-processing industry and machine building. Practice showed that steels, cast irons, surfacing alloys containing metastable austenite, alongside with a martensite, carbides etc. phases, are of high stability in dif-ferent conditions of a mechanical wear. The conducted researches have shown, what is it conditioned by synergetic influence to non-equilibrium system. The dissipation of energy, which is brought to a working surface by external exposure, is most effec-tively made by microheterogenous structure with metastable austenite, transforming into a dispersed martensite on-stream. Structure self-organizing conditioned by re-laxation processes at martensite formation, along with formation of compression stresses of high-level strain hardenings of surface layer provide high stability at sur