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以Ni-Mo合金粉末为原料,利用激光熔化沉积技术制备出主要由高硬度NiMo金属间化合物和高强韧性镍基固溶体γ组成的γ/NiMo近共晶合金,分析了合金的显微组织并在室温干滑动磨损条件下测试了合金的耐磨性。结果表明,γ/NiMo近共晶合金组织细小、均匀致密;由于NiMo金属间化合物的高硬度与γ的高强韧性配合,合金在两种滑动速度时的磨损量均较低且几乎不随法向载荷的增加而变化,表现出优异的磨损载荷特性,而摩擦系数随法向载荷的增加显著降低,特别是在较高滑动速度时合金反而具有较低的磨损量和摩擦系数。合金在滑动速度0.93 m/s,法向载荷196 N时的磨损量仅为相同条件下淬火45#钢磨损量的1/10。
Using Ni-Mo alloy powder as raw material, the γ / NiMo eutectic alloy composed of high hardness NiMo intermetallic compound and high strength and ductility Ni-based solid solution γ was prepared by laser melting deposition technique. The microstructure of the alloy was analyzed and analyzed in The wear resistance of the alloy was tested under dry sliding wear at room temperature. The results show that the microstructure of γ / NiMo near-eutectic alloy is fine and uniform. Due to the high hardness of NiMo intermetallic compound and the high strength and toughness of γ, the wear amount of the alloy at both sliding velocities is low and hardly varies with the normal load , Showing an excellent wear load characteristics, and the friction coefficient decreased significantly with the increase of normal load, especially at higher sliding speed the alloy has a lower wear and friction coefficient. The wear rate of the alloy at the sliding speed of 0.93 m / s and the normal load of 196 N is only 1/10 of that of the quenched 45 # steel under the same conditions.