Getting hromoalitirovannyh coatings on carbon materials in self-propagating high-temperature synthesis

Abstract

Purpose. The disadvantages of materials operating at high temperatures, wear and corrosion when used in the aerospace industry are inadequate erosion and low oxidation resistance. In many cases, the cause of poor durability of materials is the residual porosity, inevitable in their preparation and production, and a thin reflective coating. Methods. Proposed a promising method for the application of protective heat-resistant coatings - technology for producing coatings under samorasprastranyayuschegosya high-temperature synthesis (SHS). This process is the most promising and less costly, since it does not require changes in the technology of carbon materials, and the protective layer forms a thin film that is by reacting carbonaceous materials with no change in its mechanical properties as a whole. The Results. The test samples were performed on heat resistance in air in the temperature range 800 - 1200 ° C. It was found that the coating CrAlTi and CrAlSi, successfully defending uglerodeste materials from oxidation at temperatures 1050 - 1100 ° C. Thus, after testing at 1200 ° C for 20 hours was no significant signs of damage (the coating was dense, the weight gain of the samples was not significant). Scientific novelty. We have studied the possibility of obtaining carbon materials for protective coatings hromoalyumotitanirovannyh and hromoalyumosilitsirovannyh in a self-propagating high-temperature synthesis, for critical parts of aircraft operating at high temperatures and corrosive media, metallographic examinations were carried out and tested the properties of coatings. The practical significance. Transport method of coating using SHS provides a CCC with completely new technological properties without requiring high energy and time.