Ni-P-多壁碳纳米管复合镀层的制备及自润滑机理  

Preparation and self-lubricating mechanism of Ni-P-multi-walled carbon nanotubes composite coating

作　　者：孟振强[1] 熊拥军[1] 刘如铁[1] 赵福安[1] 李溪滨[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2012年第9期3394-3400,共7页Journal of Central South University:Science and Technology

基　　金：国防科工委军品配套项目(JPPT-115-5-1759);粉末冶金国家重点实验室自主课题(2011091Z)

摘　　要：以经过湿式球磨的多壁碳纳米管(MWNTs)为增强相,通过化学镀制备Ni-P-MWNTs复合镀层;对比测试复合镀层和普通Ni-P镀层在干摩擦条件下的摩擦磨损性能,并分析复合镀层的自润滑机理。研究结果表明:湿式球磨有利于改善MWNTs的润滑性和分散性;MWNTs均匀分布于镀层基体中,使复合镀层的维氏硬度提高至1 050;复合镀层的减摩抗磨能力明显比Ni-P镀层的减摩抗磨能力强,在测试条件下,其摩擦因数和磨损率分别为0.08和6.22×10?15 m3/(N.m);在复合镀层对偶钢球的表面形成了以类石墨结构碳为主要成分的转移膜,这层膜阻止了复合镀层与钢球之间的直接接触,使摩擦过程处于良好的自润滑状态,从而降低了摩擦因数,提高了材料的耐磨能力。Multi-walled carbon nanotubes（MWNTs） treated by a wet ball milling process were used as reinforcement agent to prepare Ni-P-MWNTs composite coating by electroless deposition.The tribological properties of the composite coating and conventional Ni-P coating were tested.The self-lubricating mechanism of the composite coating was also investigated.The results show that the wet-milled MWNTs,with wettability and dispersion improved effectively,are uniformly embedded in the matrix and the Vickers hardness of the composite coating reaches 1 050.Compared with Ni-P coating,the composite coating reveals much better friction and anti-wear performance,and the friction coefficient and wear rate are only 0.08 and 6.22×10-15 m3/（N.m）,respectively.A transfer film with graphitic carbon which is the main component is formed on the worn surface of the steel ball sliding against the composite coating.The transfer film can avoid the direct contact between the composite coating and the steel ball,keep sliding well lubricated and thus very low friction coefficient and wear rate are available.

关 键 词：碳纳米管 化学镀 球磨 自润滑 

分 类 号：TG174.44[金属学及工艺—金属表面处理]