Technology of Preparation of Metal Parts for Heat-Resistant Coating

Abstract

Modern missile systems are designed considering reusable use, which can significantly reduce the cost of subsequent launches. At the same time, the thermal load on the fire walls of the combustion chambers (CS) of liquid rocket engines increases, which requires their protection from multiple thermal effects and the development of special coatings. One of the effective ways to increase the life of the most heat-loaded elements of the CS is the application of multilayer heat-resistant coatings [1,2], which have good erosion resistance and high thermal resistance in conditions of intensive exposure to high-temperature combustion products. The defining characteristic of such coatings is the adhesive strength of adhesion to the substrate, the quality of which depends on the preparation of the surface of the part under the coating Justification of methods of applying heat-resistant coatings Combustion chamber and jet nozzle (Figure 1) have a complex geometric profile and works with a large range of temperatures generated during combustion of the fuel. The technological process of plasma coating containing powders includes several operations [3,4], surface preparation, application of a sublayer (if necessary) and a layer of heat-resistant coating, and in some cases -subsequent mechanical and thermal treatment.