RESTORATION OF WORN SURFACES OF PARTS BY PLASMA SPRAYING OF COMPOSITE COATINGS
Keywords:
plasma spraying processes, powder compositions, plasma spraying in air, metal alloys based on m-rolls, performance characteristics, morphology and structureAbstract
The article describes the technology for restoring and strengthening worn surfaces of parts by plasma spraying of composite coatings made from m-rolls. The composition of the powders was selected taking into account the following premises. The oil-retaining ability of the applied coatings is ensured by the Ni, Cr, Fe component. The number of ion-dipole bonds between metal ions and oil dipole groups increases, the oil-retaining ability of the metal surface and its wear resistance increase. The hardness of the applied coatings is ensured by carbide inclusions. At the same time, the degree of deformation of the friction surface of the coatings and the area of actual contact of the run-in tribological interfaces decreases. Conditions are created to improve the anti-friction properties of friction pairs. The combination of components in powders ensures the formation of sawn coatings with a friction-friendly structure of hard carbide inclusions distributed in a relatively soft matrix. Recommendations are given on optimal plasma spraying modes and areas of application of restored parts. The structure of coatings obtained using optimal technology consists of a solution (binder, matrix) and carbide inclusions. This structure is characterized by oil-retaining ability and hardness, creating the prerequisites for wear resistance and improving the anti-friction properties of the surface restored by spraying. Oil-holding capacity is ensured by the presence of nickel, iron, carbon, chromium, which determine the effective interaction of the lubricant and coating due to forces of physical and chemical nature. Increased hardness of the layers is provided by the carbide phase. The surface of such a coating is characterized by significant fluctuations in hardness with low values in certain extended areas formed mainly by the binder material.
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