Nickel-coated carbon nanotubes (Ni-CNTs) were achieved by electroless plating. Laser cladded IN718 and IN718 with 10, 30, and 50 wt% additions of Ni-CNTs were fabricated. The structural evolution of CNTs in the laser-deposited layers was studied; the microstructure, tensile, and wear properties of the laser-cladded alloys were characterized. The results show that CNTs in the laser-deposited layers are mostly transformed to carbon nanoproducts (CNPs) in the forms of graphene nanosheets, graphene fragments, carbon nanoribbons, and diamond-like nanoparticles by unzipping, interbonding, collapsing, and curvature of CNTs. The interdendritic Laves phase formation is dramatically depressed due to the addition of Ni-CNTs, but the excess addition of the Ni-CNTs can undesirably increase the formation of NbC. The addition of Ni-CNTs effectively improves the tensile and wear properties. The most superior tensile and wear properties are achieved in the layers with 30 and 50 wt% additions of Ni-CNTs, respectively. The generation of intermetallic phase and CNPs are revealed to be two dominant effects both on the tensile and wear properties of the laser-cladded alloys.

镍镀碳纳米管（Ni-CNTs）通过化学镀获得。制作了掺有10、30和50 wt％的Ni-CNT的激光熔覆IN718和IN718。研究了激光沉积层中碳纳米管的结构演变；表征了激光熔覆合金的组织，拉伸性能和磨损性能。结果表明，激光沉积层中的CNT通过CNT的解压缩，相互键合，塌陷和弯曲而大部分以石墨烯纳米片，石墨烯碎片，碳纳米带和类金刚石纳米颗粒的形式转化为碳纳米产品（CNP）。由于添加了Ni-CNT，树枝状Laves相的形成被显着抑制了，但是过量添加Ni-CNT会不希望地增加NbC的形成。Ni-CNT的添加有效地改善了拉伸和磨损性能。在分别添加30和50 wt％的Ni-CNT的层中获得了最优异的拉伸和磨损性能。金属间相和CNP的产生被揭示是对激光熔覆合金的拉伸和磨损性能的两个主要影响。