化学镀耐磨自润滑Ni-P复合镀层的摩擦磨损性能

利用化学复合镀技术制备了Ni-P-碳纳米管(Ni-P-CNTs)和Ni-P-无机类富勒烯WS2Ni-P-(IF-WS2)]复合镀层,考察了复合镀层的减摩抗磨性能.结果表明,Ni-P-CNTs和Ni-P-(IF-WS2)复合镀层的减摩抗磨性能优于化学镀Ni-P和Ni-P-石墨镀层,其原因在于Ni-P-CNTs化学复合镀层中的碳纳米管具有优异力学性能和同轴石墨纳米管结构,而Ni-P-(IF-WS2)化学复合镀层中的IF-WS2具有封闭层状类富勒烯球形结构,二者均具有优异的自润滑性能.

Friction and Wear Behavior of Electroless Wear-Resistant and Self-Lubricating Ni-P Composite Coatings

Ni-P-carbon nanotubes (Ni-P-CNTs) and Ni-P-inorganic fullerene-like WS_2 (Ni-P-(IF-WS_2)) composite coatings were prepared by electroless plating. The morphologies and microstructures of the CNTs and IF-WS_2 nanoparticles were analyzed by means of scanning electron microscopy, transmittance electron microscopy, and X-ray diffraction, while the phase structure and composition of the resulting composite coatings were characterized by means of X-ray diffraction and elemental analysis. The friction and wear behaviors of the self-mated pairs of the resulting composite coatings were investigated on an MHK-500 ring-on-block friction and wear tester under the lubrication of a mechine oil. It was found that the electroless Ni-P-CNTs and Ni-P-(IF-WS_2) composite coatings recorded much better friction-reducing and antiwear properties than the Ni-P and Ni-P-graphite coastings. The significant improvement in the tribological properties of the Ni-P-CNTs was attributed to the excellent reinforcing effect and self-lubricity of the CNTs of coaxial graphitic nanotube structures. In a similar manner, the nested hollow inorganic fullerene-like structure of IF-WS_2 nanoparticles and its rolling effect during the friction process accounted for the excellent tribological performance of Ni-P-(IF-WS_2) composite coating.