Comparison of CrN, AlN and TiN Diffusion Barriers on the Interdiffusion and Oxidation Behaviors of Ni+CrAlYSiN Nanocomposite Coatings

CrN, AlN, TiN layer were prepared as diffusion barriers between the K417 substrate and Ni+CrAlYSiN nano composite coatings via vacuum arc evaporation. Oxidation kinetics microstructure evaluation of these coating systems at 1000 °C after 100 h studied. Results show that AlN showed good thermodynamic stability, effectively inhibited interdiffusion substrate, improved oxidation resistance coatings, a single-layer Al2O3 film was formed on coating. The CrN decomposed, which did not block elements had little effect prevented substrate. However, it deteriorated Similar to without barrier, double-layer oxide structure with inner Ni(Al,Cr)2O4 outer or barrier.