电刷镀镍/碳纳米管复合纳米镀层的结构与磨损性能

用含碳纳米管的快速镍电刷镀液制备了镍/碳纳米管复合纳米镀层,研究了热处理温度和镀液中碳纳米管含量对镀层平均晶粒尺寸、结构、力学性能及耐磨性能的影响。结果表明,镀层的晶粒大小随热处理温度的升高是先降低而后增大的;同样碳纳米管的加入对镍刷镀层的平均晶粒尺寸和微结构有显著的影响。镀层的硬度和耐磨性与镀层的平均晶粒尺寸有非常好的对应关系。热处理和碳纳米管的强化作用可导致镀层晶粒细化和结构致密化,从而有效地改善了镀层的力学性能和耐磨性能。

Microstructures and Wear Behaviour of Ni/Carbon Nanotube Composite Coatings Prepared by Electro-brush Plating

Ni/carbon nanotube composite nanocoatings were prepared by electro-brush plating.The average grain size and microstructure of the nickel nanocoatings heated at different temperature for 2 h and Ni/carbon nanotube composite nanocoatings were examined by X-ray diffractometer(XRD),and their wear behaviour and microhardness were investigated.The average grain size of the nickel nanocoatings are greatly affected by heating treatment temperature,whereas the average grain size of the Ni/carbon nanotube composite nanocoatings are mainly controlled by carbon nanotube content in electrolyte.The wear behaviour and microhardness of the nanocoatings is closely related to the average grain sizes and microstructures of the nanocoatings.The excellent antiwear and mechanics properties of the nanocoatings are due to the small grains and compact microstructures of the nanocoatings caused by heating treatment temperature and carbon nanotube used as a preventing agent.