Research progress on laser cladding for high-temperature wear and corrosion resistant transition metal silicides composite coatings

Transition metal silicides-based alloys represent the largest family of intermetallic compounds having many attractive attributes for wear and corrosion properties and are, from tribology and surface engineering points of view, a prospective new class of advanced tribological coating materials for applications under corrosive and oxidative hostile service conditions because of their intrinsic high hardness, covalent-dominated strong atomic bonds and excellent chemical and thermodynamic stability. This article summarizes the progress on laser clad wear and corrosion resistant multi-functional metal silicides composite coatings currently undertaking in the authors' laboratory. Microstructure, wear and corrosion resistance of laser clad Ti5Si3/NiTi2, Cr3Si/Cr2Ni3Si, Ni2Si/NiSi, Mo2Ni3Si/NiSi metal silicides coatings were reported.