Fabrication of Co Based Coatings on Titanium Alloy by Laser Cladding with CeO2 Addition
In this study, Co based laser cladding coatings reinforced by multiple phases were fabricated on titanium alloy. Co42 Co based self fluxing alloy, B4C, and CeO2 mixed powders were used as the precursor materials. The coatings were mainly composed of g Co/Ni, CoTi2, CoTi, NiTi, TiC, Cr7C3, TiB2, and TiB phases. A typical TiB2/Cr7C3/TiC composite structure was chosen. It was found that CeO2 did not influence the phase types of the coating significantly, but was effective in refining the microstructure and enhancing the microhardness and dry sliding wear resistance. Compared with the Ti 6Al 4V titanium alloy, the microhardness and wear resistance of the composite coatings were enhanced by 3.44 4.21 times and 14.26 16.87 times, respectively.