电刷镀镍／炭纳米管复合纳米镀层的结构与耐磨性能

Microstructures and Wear Behaviour of Ni/Carbon Nanotube Composite Nanocoatings by Electro-Brush Plating

摘要:

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。研究了镀液中碳纳米管含量对镀层平均晶粒尺寸、显微结构、力学性能及耐磨性能的影响。结果表明：镀液中碳纳米管含量对镍刷镀层的平均晶粒尺寸和微结构有显著的影响，当镀液中碳纳米管含量为4％（质量分数）时，镀层有约16nm的最小晶粒尺寸：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：碳纳米管的弥散强化作用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。

Abstract:

Carbon nanotube was used as a preventing agent to prepare Ni/carbon nanotube composite nanocoatings. Effect of carbon nanotube content in electrolyte on average grain size, microstructure, microhardness and antiwear properties of the Ni/carbon nanotube composite nanocoatings was investigated. The results indicate that average grain size and microstructure of the Ni/carbon nanotube composite nanocoatings are mainly controlled by carbon nanotube content in electrolyte. The Ni/carbon nanotube composite nanocoating has an average grain size of about 16 nm as the carbon nanotube content in electrolyte is 4 wt%. The wear behaviour and microhardness of the Ni/carbon nanotube composite nanocoatings is closely related to the average grain sizes and microstructures of the Ni/carbon nanotube composite nanocoatings. The excellent antiwear and mechanical properties of the Ni/carbon nanotube composite nanocoatings are attributed to the small grains and compact microstructures of the Ni/matrix composite nanocoatings caused by carbon nanotube used as a preventing agent.