LaF_3 Influences on Wear Resistance of TiC/Ni cladding layer by Laser Cladding in-situ fabricated

摘要

The TiC/Ni composite coating was prepared by Laser Cladding In-situ Synthesis on the surface of damper plate with Ni--Ti-Mo-C -LaF_3 powder. Microstructure and Wear resistance have been studied throughout EPMA, SEM and M-2000 Friction and Wear Tester. It was found that the microstructure got more homogenized grain fineness became finer, TiC distributed better and heterogeneous phase decreased, as adding moderate rare earth LaF_3. When the content of LaF_3 was 1%, the highest microhardness was got. While the optimal wear resistance properties were obtained with 2% LaF_3. The laser cladding with excessive LaF_3 has more TiC particle segregation which induces hardness and wear resistance of cladding layer.