High temperature behaviors of high velocity arc sprayed Fe-Al/Cr₃C₂ composite coatings

Fe-Al/Cr₃C₂ composite coatings were manufactured using high velocity arc spraying (HVAS) technology. The high temperature erosion, wear and corrosion resistance of the coatings were investigated. The coating properties such as bonding strength,porosity, hardness as well as microstructures were characterized. The results show that the coatings have relatively high heat tremble bond strength, hardness, and typical layer-shaped coatings' microstructures. With the rise of temperature, the coating erosion resistance increases too; the impingement angel does effects on erosion properties, and the erosion mechanism changes from ductile to brittle behaviors at 450℃. The coatings have good room temperature wear resistance and relatively good high temperature resistance.The wear mechanism of the coatings is peeling wear behavior. The coatings have excellent high temperature corrosion resistance because of the produce of oxides during corrosion.