Dependence of pH level on tribological effect of graphene oxide as an additive in water lubrication
Dependence of pH level on tribological effect of graphene oxide as an additive in water lubrication
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DOI：
10.15282/ijame.13.1.2016.2.0262
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发表时间：
2016-06-01
影响因子：
1
通讯作者：
Fujii, M.
中科院分区：
文献类型：
--
作者：
Alias, A. A.;Kinoshita, H.;Fujii, M.
进行了分散在水中的氧化石墨烯（GO）作为碳化钨（WC）销对不锈钢（SUS 304）板之间的润滑剂添加剂的有效性的研究。A 0.1重量%制备GO并将其用作润滑剂，在3 N的施加载荷下进行20，000次往复摩擦学测试的摩擦循环。结果表明，pH为3的GO分散体提供最低的摩擦系数，其为约0.05。SUS 304平板和WC球表面的磨损痕迹上的磨损区域也较小。pH值的增加明显影响摩擦学性能，其中摩擦系数增加到约0.10-0.20在稳定状态下的pH值为5，pH值为7和pH值为9。同时，具有pH 10的GO分散体不能为测试材料提供良好的摩擦学性能。显微图像上的观察结果显示，形成的摩擦膜的磨损轨道上的低pH值。摩擦膜引起的摩擦力的减少，并保护板在滑动试验期间的严重磨损。
A study of the effectiveness of graphene oxides (GO) dispersed in water as a lubricant additive between tungsten carbide (WC) pin against stainless steel (SUS304) plate was carried out. A 0.1 wt.% GO was prepared and used as a lubricant under an applied load of 3 N for 20,000 friction cycles of reciprocating tribological testing. The results show that a GO dispersion with pH 3 provided the lowest friction coefficient, which was approximately 0.05. Worn areas on the wear track of the SUS304 flat plate and WC ball surface were also small. The increasing pH obviously affected the tribological properties, where the friction coefficient increased to approximately 0.10-0.20 in the steady state for pH 5, pH 7 and pH 9. Meanwhile, a GO dispersion with pH 10 was not able to provide good tribological properties for the tested materials. The observations on microscopic images revealed the formation of tribofilms on the wear tracks for low pH. The tribofilms caused reduction of the friction force and protected the plates from severe wear during the sliding tests.