Study on the Microstructure and Wear Behavior of AlCoCrFeNiTi-NiCrBSi Composite Coatings by Atmospheric Plasma Spraying

The microstructure of plasma sprayed AlCoCrFeNiTi-NiCrBSi composite coatings was analyzed and microhardness and high-temperature wear resistance were measured. The results show that dense, hard coatings with good adhesion strength were achieved. In wear tests, the volume loss of the as-sprayed coating at room temperature was 21% of that of 316 stainless steel and only 5% at 900 °C. Abrasion wear was the main failure mechanism over the temperature range, with adhesion wear appearing at around 900°C. Peeling was also observed on some worn surfaces.