CVD Technology for Preparing Wear-Resistive Chromium Carbide Coatings of Engine Components

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.