Heat-resisting CoNiCrAl coatings obtained by the Arc-PVD method and chromoaluminized on the nickel base superalloys.

In the article the investigation results of obtaining and properties of the heat-resisting MeCrAlX coatings are presented. The coatings were formed on nickel. In the first stage the CoCr coatings were obtained by the Arc-PVD method (cathodic vacuum arc evaporation). Basic parameters of coatings formation were determined. High efficiency of the Arc-PVD method in the deposition from one or two sources of the complex chemical composition are shown. Relationships between the chemical composition of targets and the chemical composition of the coatings obtained by the Arc-PVD method were determined. Targets with the content of 70 wt. % Co and 30 wt. % Cr. The basic deposition parameters were determined. In the second stage coatings underwent the diffusion chromoaluminizing process. Combining the PVD and diffusion processes allowed to eliminate the substrate detrimental elements: Mo, W and Ti lowering oxidation and 'hot corrosion' resistance from the coatings.