INVESTIGATION OF THE IMPACT OF COMPRESSION PLASMA FLOWS ON MULTILAYER COATINGS
Keywords:
ceramic-metal plasma coatings, compression plasma flows, treatment distance, formed structures, surface layers, formed wear-resistant coatingsAbstract
The article presents the results of studying the impact of compression plasma flows, which are generated by quasi-stationary plasma accelerators, on multilayer protective coatings obtained using plasma spraying in
air. Under shock and wave effects of pulses of the compression plasma flow, plastic deformation and significant
compaction of the treated layer of the applied plasma coating occur. Ultrafast cooling and corresponding heat
removal to the substrate, after melting of the formed layer with a thickness of about 20-30 microns, is the result
of the thermal effect of compression plasma pulses. There are significant structural-phase changes in the modified area. The impact of high-temperature plasma pulses on the "base-coating" system leads to the melting of the
resulting coating and the base layer and the subsequent liquid-phase mixing of these components under the influence of the pressure of the plasma flow. The action of plasma flows on the surface of the resulting material
leads to significant changes in morphology. The degree of short-term melting in compositions containing various
phases affects the number of centers of passing crystallization, leading to strengthening of structures during ultra-rapid cooling.
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