Research Progress on Improving Plasma-Sprayed Coating Properties by Laser Remelting

Plasma-spraying can melt powders with high hardness and high melting point and has no special requirements to the substrate, and is widely used in the preparation of metal, ceramic and composite coatings. Laser remelting can effectively eliminate the inherent defects of plasma-sprayed coatings, such as layered structure, pores and micro-cracks, and improve bonding between the coating and substrate, so as to improve the properties of plasma-sprayed coating. The research progress on plasma-sprayed coatings modified by laser remelting is summarized from three aspects of plasma-sprayed metal coating, ceramic coating and composite coating. The existing problems in the current research are discussed, and the future research direction is prospected.