Research Progress on Laser Cladding for High-Temperature Wear and Corrosion Resistant Transition Metal Silicides Composite Coatings

摘要

Transition metal silicides-based alloys represent the largest family of intermetallic compounds having many attractive attributes for wear and corrosion properties and are, from tribplogy 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 Ti_5Si_3/NiTi_2, Cr_3Si/Cr_2Ni_3Si, Ni_2Si/NiSi, Mo_2Ni_3Si/NiSi metal silicides coatings were reported.