INFLUENCE OF THE QUALITY OF INITIAL M-ROLL POWDERS ON THE STRUCTURE AND PROPERTIES OF MULTILAYER PLASMA COATINGS
Keywords:
nickel-based metal alloys, oxide ceramics, calcium thermal powder, atomized powder, submerged flux melted powder, operational characteristics, morphology and structureAbstract
The article describes the influence of the quality of initial m-rabbit powders on the structure and properties of multilayer plasma coatings. The qualitative indicators of the heat resistance of the alloys and the resulting coatings are associated with the formation of a continuous oxide film on their surface during deposition, which prevents the interaction of an aggressive environment and material. Most modern nickel-based alloys used in technology used to form plasma coatings contain 6-12% aluminum, 20-30% chromium, and 0.15-1.0% reactive element (yttrium, tantalum, etc.). For spraying, five types of powders were used. Metallographic studies have established that calcium-thermal powders are conglomerates with a highly developed specific surface. However, the degree of sphericity can vary within very wide limits, and this shortcoming can probably be eliminated to a large extent by mechanical methods. Atomized powders have a spherical shape, but the peculiarity is that on the surface of some particles there is an alloy film that peels off during the preparation of thin sections and has a structure different from the body of the particle. For powders melted under flux, such a film is thicker and occurs on particles more often than for powders melted in vacuum. However, in both cases, X-ray microanalysis established that in the film, in comparison with the body of the particle, the oxygen content is increased by an order of magnitude and the aluminum content is several times higher.
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