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A chemical vapor deposition method for preparing high-quality chromium carbide coatings was developed. The resulting coatings exhibit high adhesion and increase wear resistance of the cylinder piston group components as compared to common coatings prepared by electrolytic chromium plating. The operation performance of the coatings was tested using scrapper piston of the Raba-Man diesel engine of Ikarus bus and compression and oil scrapper rings of the diesel engine 10D100. It was found that chromium coatings prepared by the method proposed are characterized by relatively low coefficient of friction and high corrosion resistance.

A chemical vapor deposition method for preparing high-quality wear-resistive chromium carbide coatings was developed. The large scale CVD installation was designed. The results of the industrial tests of the chromium carbide coatings of the cylinder piston group components and nozzles are presented. The resulting coatings exhibit excellent adhesion (more than 100 MPa), low coefficient of friction (0.04 - 0.06), high microhardness (12-14 and up to 20-24 GPa depending on the experimental conditions), and wear resistance from 3 to 10 times higher as compared to electroplated chrome. The coating process is environmentally friendly, it is characterized by high adaptability and relatively low cost.