Microstructure and tribological properties of stainless steel coatings sprayed by two methods based on spraying

In this work, the microstructure and sliding wear behaviors of stainless steel (AISI 420) coatings prepared by electro-thermal explosion directional spraying (EEDS) and high velocity arc spraying (HVAS) were comparatively investigated. Results show that the EEDS coatings possess more compact microstructure, higher nano-hardness and nano-elastic modulus, finer bond and better wear resistance than the HVAS coatings. The dominant wear mechanism of EEDS coatings is slight furrow and that of HVAS coatings is serious furrow and delamination.