摘要
为了降低纯镍镀层的摩擦因数,研究镍基MoS_2复合镀层适用温度范围,进一步提高金属机件在极端摩擦条件下的服役寿命。采用电化学沉积法在45钢基体表面制备不同MoS_2浓度的镍基固体润滑复合镀层。用复合电镀循环伏安曲线法研究复合镀层的电化学沉积规律,采用XRD、SEM对复合镀层的组织结构及摩擦形貌进行分析探讨,对比分析不同含量MoS_2复合镀层的摩擦磨损性能及机制。结果表明:MoS_2的加入促进了阴极极化,提高了镀层的结晶细致程度;同时能显著降低镀层摩擦因数,在MoS_2浓度为30 g/L的溶液中沉积的复合镀层在室温下的摩擦因数最低为0.02~0.03;在400℃以下摩擦环境中,复合镀层摩擦因数保持在0.02~0.05之间,具有很好的润滑性能;温度超过400℃时,MoS_2将逐渐被氧化为Mo O3,摩擦因数接近0.15,失去润滑效果。
In order to reduce the friction coefficient of pure nickel coating, and study the temperature range of Ni-based MoS2 composite coating to extend the life of metal parts in extreme friction conditions. A kind of solid lubrication coatings with different MoS2 contained concentrations were prepared on the 45 steel substrate by electro-chemical deposition. The cyclic voltammetry method was applied to investigate the electro-chemical depositing regulation of the composite coatings. Microstructure, wear surface, tribological properties and wear mechanism of the composite coatings with different MoS2 were researched by XRD and SEM. The results show that the addition of MoS2 can promote the cathode polarization and increase the crystallinity of the coating. The friction coefficient of the composite coatings significantly decreases, and the lowest friction coefficient at room temperature is about 0.02？0.03 with a MoS2 content of 30 g/L. The friction coefficient of the composite coating changes from 0.02 to 0.05 under 400 ℃, which shows good lubrication performance. When the temperature is up to 400 ℃, the friction coefficient continuously increases to 0.15, because MoS2 is gradually oxidized into MoO3, and the lubrication ability is lost.
出处
《中国表面工程》
EI
CAS
CSCD
北大核心
2017年第3期97-103,共7页
China Surface Engineering
基金
国家国际科技合作项目(2015DFR51090)
国家自然科学基金(51674130)
国家高端外专项目(GDT20156200088)~~
关键词
自润滑复合镀层
摩擦磨损
宽温域
self-lubricating composite coatings
friction and wear
wide temperature range
