High-temperature sliding wear behaviors of laser clad Mo2Ni3Si/NiSi metal silicide composite coatings

A novel wear- and oxidation-resistant Mo2Ni3Si/NiSi metal silicide composite coatings were fabricated on substrate of an austenitic stainless steel by laser cladding using Ni–Mo–Si elemental powder blends. The microstructure of the coating was characterized by optical microscope (OM), scanning electron microscope (SEM), X-ray diffraction (XRD) and energy dispersive spectrometer (EDS). The high-temperature wear resistance of the coating was evaluated under sliding wear test conditions. Results show that microstructure of the coating consists of the Mo2Ni3Si primary dendrite and interdendritic Mo2Ni3Si/NiSi eutectic. Due to the presence of a large amount of hard and wear-resistant Mo2Ni3Si phase, the laser clad Mo2Ni3Si/NiSi metal silicide composite coating has excellent wear resistance under high-temperature sliding wear test conditions.