Interface microstructure and wear properties of TiC-Ni-Mo coatings prepared by in-situ fabrication of laser cladding

TiC-Ni-Mo composite coating was prepared by in-situ fabrication of laser cladding. The interface microstructure and wear properties of the coating was investigated by means of EPMA, TEM and wear tests. The results show that, adding 5% Mo into the coating could improve uniformity, rigidity, wear resistance, refine TiC grains, reduce friction coefficients and exist orientation relationship: (001)_TiC//(111)_γ-Ni. The rigidity and wear resistance of coating decrease with the content of 10 % Mo. There are many directional dislocations inside TiC phase and dislocation tangles inside γ-Ni-binder phase. The wear mechanism of the coating is anti-wear action of reinforcing phases. The wear morphology is short and shallow furrows.