STUDY OF PROCESSED BY COMPRESSION PLASMA OF MULTILAYER PLASMA COATINGS BASED ON CERAMICS
Keywords:
ceramic-metal plasma coatings, compression plasma flows, treatment distance, molded structures, near-surface layers, wear-resistant coatings, mechanical propertiesAbstract
The article considers the technique of compression plasma treatment of multilayer plasma coatings based on
cermet powders. The optimization of the modes of action on the near-surface layers of the formed wear-resistant
coatings was carried out, both the distance of the compression-plasma treatment and the total number of input
energy pulses were varied. Both the level of energy supplied to the formed coating and necessary for the processes of their melting and compaction, and the thickness of the resulting layers formed during their processing,
depend on these technological parameters. In all experiments, the optimal criterion for the experiment was to
obtain a total porosity in the near-surface layers in the range of 1.5–2.5%, these parameters provide an improvement in the oil-retaining capacity and lead to an increase in the wear resistance of the formed wearresistant plasma coatings. The optimal distances according to the criteria we have chosen when processing
near-surface layers of formed wear-resistant coatings are 0.09-0.10 m (for ПР-X18H15) and 0.10-0.11 m (for
ПР-X18H15 - Mo - MoS2). When controlling the parameters of the total porosity in accordance with the applied
processing distances, almost complete coincidence with the required values of 1.0–2.0% is seen. Under a single
impact with a pulse, the grains in the layers treated with a plasma flow are angular, non-isometric, and oriented
almost in the direction perpendicular to the plane of the treated sample. This preferred orientation of grains is
probably associated with the crystallization process during further cooling of the sample in the directions of heat
removal.
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