Microstructure and Tribological Properties of In-situ Synthesized TiB2-TiC／Ni Based Composite Coating by Laser Cladding

摘要: ATiB2 and TiC particles reinforced Ni based composites coating was prepared on TC4 alloy surface by chemical reaction among Ti, B C elements using laser cladding technique. Microstructural analysis showed that the sizes of in-situ synthesized TiB2 ranged within 5～10μm 1～2μn, respectively, while both two kinds were uniformly distributed in clad layer. The measurement microhardness wear friction properties indicated layer HV900～1100, being three times alloy; coefficient air vacuum (10-5 Pa) 0.2～0.3 0.3～0.5, respectively; rate terms mass loss considerably lower than environment.