State of the art and prospects on laser clad multiphase transition metal silicides wear and corrosion resistant coatings for the aerospace and petrochemical industries

Wear and corrosion resistant multi-phase transition metal suicides coatings including W₂Ni₃Si/W₅Si₃, Ti ₅Si₃/NiTi₂, Ti₂Ni ₃Si/NiTi, etc, were developed and fabricated by laser cladding process. Tribological properties were evaluated under dry sliding and reciprocating fretting wear test conditions and the responding wear mechanisms were discussed as functions of microstructure constitutions and test conditions. High temperature oxidation resistance of the coatings was investigated. The coatings exhibited excellent combination of room and high temperature metallic sliding wear resistance, fretting propertiy, metallic tribological compatibility, good oxidation resistance and abnormal wear-load dependence. Applications of the coatings were prospected for the aerospace, petrochemical and energy-processing industries.