凹凸棒石黏土作为润滑油添加剂的摩擦学性能

Tribological Properties of Attapulgite Clay as Lubricant Additive

采用SRV-IV摩擦磨损试验机考察了凹凸棒石黏土作为润滑油添加剂的摩擦学性能,借助SEM及EDS分析了摩擦表面的微观形貌及元素组成。结果表明,在试验所用的载荷和频率条件下,加入凹凸棒石黏土之后润滑油的摩擦因数和磨损量均有不同程度的降低。固定频率10Hz,当载荷为50N时,平均摩擦因数降低幅度达到了43.08%,当载荷为20N时,上下试样磨损率降低幅度分别达到了59.05%和85.48%。加入凹凸棒石黏土之后磨损表面更加光滑平整,表面氧元素含量升高。这主要归因于凹凸棒石黏土的层链状晶体结构和摩擦过程中复杂的物理化学过程。

The tribology properties were investigated on a standard optimal SRV-IV tribometer.The elemental component and morphology on worn surface were analyzed by SEM coupled with EDS.The results show that the friction coefficient and wear rate of the contacts lubricated with the oil contained attapulgite clay decrease more than those lubricated with base oil.The average friction coefficient of the contacts lubricated with the oil contained attapulgite clay decreased by 43.08% than that of the base oil with the load of 50N and the frequency of 10 Hz;the wear rate of the ball and disk decrease by 59.05% and 85.48% at 20 N,10 Hz,respectively.More smooth and compact tribofilm with more oxides forms the worn surface.The layer-chain crystal structure of attapulgite clay and the complex physicochemical in the friction process make the friction and wear of the tribopair decrease.