SiC-Ni60涂层中添加nano-Cu包覆MoS_(2)对其组织和摩擦磨损性能的影响  

Effect of nano-Cu-coated MoS_(2) added to SiC-Ni60 coatings on microstructure and friction and wear properties

作　　者：沈虎 李先芬[1] 叶俊洋 张雅婷 华鹏[1] 刘大双 SHEN Hu;LI Xianfen;YE Junyang;ZHANG Yating;HUA Peng;LIU Dashuang(School of Materials Science and Engineering,Hefei University of Technology,Hefei,230009,China)

机构地区：[1]合肥工业大学,材料科学与工程学院,合肥230009

出　　处：《焊接学报》2024年第9期69-75,共7页Transactions of The China Welding Institution

摘　　要：采用激光熔覆的方法在42CrMo钢基体上制备了nano-Cu/MoS_(2)镍基合金熔覆层,运用扫描电镜、XRD、显微硬度计以及摩擦磨损试验机等探究了不同含量nano-Cu/MoS_(2)熔覆层的组织及耐磨减摩性能.结果表明,采用激光熔覆技术制备的nano-Cu/MoS_(2)镍基合金熔覆层中上部为细密的等轴晶,中下部至靠近熔合线主要为条柱状晶,添加nano-Cu/MoS_(2)颗粒后覆层中部等轴晶粒部分转变为条带状,覆层中产生了金属硫化物CrS和软金属铜,晶界处分布一些细小MoS_(2)颗粒,受润滑相与部分晶粒粗化影响与C1(无nano-Cu/MoS_(2))相比,C2~C4(5%~15%nano-Cu/MoS_(2))熔覆层的硬度显著下降,但与基体相比有1.45~2.06倍,具有良好的力学性能,而摩擦质量损失增加最高达到0.0198 g,摩擦系数逐渐减小,熔覆层最低摩擦系数0.4430较C1明显降低,兼顾力学性能、摩擦系数和摩擦质量损失角度考虑,nano-Cu/MoS_(2)含量为10%,激光功率290 W、扫描速度6 mm/s时,其熔覆层力学及摩擦学性能为佳.The nano-Cu/MoS_(2) nickel-based alloy clading layer was prepared on 42CrMo steel substrate by laser cladding method.The microsturcture and tribological properties of the clading layer with different nano-Cu/MoS_(2) contents were investigated by scanning electron microscopy,XRD,microhardness tester and friction wear tester.The results show that the nano-Cu/MoS_(2) nickelbased alloy clading layer prepared by laser cladding technology has fine equiaxed crystals in the middle and upper part of the clading layer,and mainly has columnar crystals in the middle and lower part of the clading layer near the fusion line.After the addition of nano-Cu/MoS_(2) particles,the equiaxed grains in the middle part of the cladding layer were partially transformed into strips,metal sulfide(CrS)and soft metallic copper were produced in the cladding layer,and some fine MoS_(2) particles were distributed at the grain boundaries;Affected by the lubrication phase and partial grain coarsening compared with C1(0 nanoCu/MoS_(2)),the C2~C4(5%~15%nano Cu/MoS_(2))the hardness of the clading layer decreased significantly but 1.45~2.06 times compared with the substrate,with good mechanical properties;while the frictional mass loss increased up to 0.0198 g and the friction coefficient decreased gradually,the lowest friction coefficient of the clading layer(0.4430)was significantly lower than C1.Considering the mechanical properties,friction coefficient and friction mass loss,the mechanical and tribological properties of the clading layer are good at 10%nano-Cu/MoS_(2) content,290 W laser power and 6 mm/s scanning speed.

关 键 词：激光熔覆 nano-Cu/MoS_(2) 固体润滑 耐磨减摩 

分 类 号：TG401[金属学及工艺—焊接]