APPLICATION OF N-O-C-H GAS SYSTEMS FOR SYNTHESIS OF STRENGTHENING COMPONENTS IN PLASMA COATINGS

摘要

Possibility of strengthening component synthesis during plasma spraying with application of plasma-chemical reactor is considered. Thermodynamic analysis of systems based on bottled gases N_2, CO_2, C_3H_8-C_4H_(10), CH_4, as well as air (N_2 and O_2 mixture) and a number of powder materials was performed. Iron-based materials and powders with sufficiently high titanium content were selected as model ones. Fundamental possibility of producing carbides, nitrides and oxides in the condensed state is demonstrated, ranges of thermodynamic parameters, in which they exist, dependence of synthesized compound content in the system on process temperature, pressure and quantity of initial solid product were established. It is found that organization of spraying process with concurrent synthesis of strengthening components is impossible without availability of objective data on energy capabilities of plasma equipment, consisting of plasmatron-plasmachemical reactor complex. A series of experiments were performed on plasma coating spray-deposition and testing them for abrasive wear.