Rudenkiy S. Physical and technological bases of activated vacuum forming method of multifunctional coatings on metal and carbon materials

Object: steel (Steel 3, Steel 20, Steel 45, U8), refractory metals (Nb, Ta, Mo, W) and carbon materials (graphite ARV PGM-7 and carbon-carbon composite materials) with protective coatings. The purpose: development of physical and technological bases of a new method of forming of heat-resistant and erosion-corrosion resistant coatings for refractory metals, carbon-carbon composite materials and steels. Methods: vacuum activated diffusion saturation, liquid phase, SHS-process, optical and electron microscopy, measurement of the macro- and microhardness, X-ray analysis, X-ray microanalysis. Results: for the first time found that the use of sodium chloride as an activator in the diffusion saturation and the use of the reaction container with a certain ratio of geometric dimensions provide environmental cleanliness of the process and the formation of uniform coatings on products of complex shape. For the first time the research of the vacuum chroming process of steel and carbon materials in the vapor of sodium chloride is performed, the composition of the gas of the saturation medium is determined and the mechanism of formation of coatings with desired properties is established. The construction of three-layer heat-resistant coatings for carbon materials, where each layer has a specific function is developed. Field of application: physics of solid state, physics of coatings