Technology of Preparation of Metal Parts for Heat- Resistant Coating

The technological process of surface preparation for heat-shielding coating on the heat-loaded part of the combustion chamber of a liquid rocket engine is Considered. The proposed coating has several layers: internal metal, in contact with the part or substrate, and external, from a mixture of ceramic granules and metal powder. At the same time, to obtain the initial surface for the coating with the required surface layer roughness, it is proposed to use the method of blasting with abrasive grain. The article analyzes the possible mechanisms of formation of transition zones: base – coating - as well as the influence of their chemical composition on the adhesive strength of the layers. The choice of brand and combination of materials used for coating is justified. The technological modes that have been tested in production conditions when applying heat-resistant coatings on parts of modern rocket engines are proposed. The influence of modes of deposition of multilayer heat-resistant coatings and characteristics of technological equipment for the performance of products The influence of the technological parameters of the initial surface preparation process and the geometry of the obtained substrate microrelief on the adhesive characteristics of the multilayer coating operating in the high-temperature zone of the combustion chamber of liquid rocket engines is revealed.