Study on wear resistance of laser clad composite coatings on TiAl intermetallic alloy

γ-NiCrAl/Cr₇C₃/TiC composite coatings were fabricated on γ-TiAl intermetallic alloy by laser cladding with NiCr-Cr₃C₂ precursor mixed powders. Room and high-temperature (600°C) full dry sliding wear behaviors of the original TiAl alloy and laser clad composite coatings have been investigated and the corresponding wear mechanisms are discussed. Results show that higher wear-resistance of the clad composite coatings than that of the original TiAl alloy is achieved under both room and high temperature full dry sliding wear conditions. Room temperature sliding wear resistance of the composite coatings increases with the increasing amounts of Cr₃C₂ powders in the NiCr-Cr₃C₂ precursor mixed powders firstly, and then decreases when the amount of Cr₃C₂ powders is over a critical value because of the brittleness of the whole composite coating.