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运用 5kWCO2 连续激光器在 16Mn钢表面激光熔覆镍基B4 C金属陶瓷层 (NB4 C)和镍基SiC金属陶瓷层(NSiC) ,研究了两种激光熔覆层的组织、结构、显微硬度及滑动磨损特性 ,并用激光熔覆镍基合金层 (Ni6 0 )进行了滑动磨损对比试验。结果表明 ,熔覆合金层显微组织由枝晶固溶体及其间细密的共晶组织组成 ,NB4 C熔覆层主要组成相为γ Ni,γ (Ni,Fe) ,(Cr,Fe) 7C3,CrB ,Ni3B ,Fe2 B ,Fe2 3(C ,B) 6 和B4 C等 ,NSiC熔覆层主要组成相为γ Ni,γ (Fe,Ni) ,(Cr,Fe) 7C3,Cr2 3C6 和 (Cr ,Si) 3Ni3Si等。三种激光熔覆层的显微硬度及耐滑动磨损性能由高到低的顺序为 :NB4 C→NSiC→Ni6 0。
The microstructure, structure, microhardness and mechanical properties of the two laser cladding layers were studied by laser cladding of NB4C and Ni-based SiC ceramic coatings on 16Mn steel with a 5kW CO2 continuous laser. Sliding wear characteristics, and laser cladding nickel-based alloy layer (Ni6 0) sliding wear comparison test. The results show that the microstructure of the cladding layer consists of dendrites solid solution and fine eutectic structure. The main phases of the cladding layer of Nb4 C are γ Ni, γ (Ni, Fe), (Cr, Fe) 7C3, CrB, Ni3B, Fe2B, Fe2 3 (C, B) 6 and B4C, etc. The main components of NSiC coating are γ Ni, γ (Fe, Ni), (Cr, Fe) 7C3, Cr2 3C6 and (Cr, Si ) 3Ni3Si and the like. The order of the microhardness and sliding wear resistance of the three laser cladding layers from high to low is: NB4 C → NSiC → Ni6 0.