凹凸棒石黏土润滑油添加剂对钢/钢摩擦副摩擦学性能的影响

Tribological Properties of Attapulgite Clay as Lubricant Additive for Steel-Steel Contacts

采用天然凹凸棒石黏土作为润滑油添加剂加入150SN润滑油中,在Optimal SRV-IV摩擦磨损试验机上研究了添加剂含量对钢/钢摩擦副摩擦学性能的影响,借助SEM及EDS分析了摩擦副的表面形貌及表面元素组成.结果表明:凹凸棒石黏土的浓度为0.6%可使平均摩擦系数较基础油润滑条件下降低42.32%;凹凸棒石黏土的浓度为0.4%可使磨损体积降低85.48%;凹凸棒石黏土的加入使得磨损表面更加光滑平整,同时磨损表面氧元素含量升高.分析认为凹凸棒石黏土层链状的晶体结构和摩擦过程中复杂的理化过程是实现减磨抗磨的原因.

The attapulgite clay powder is dispersed in 150SN mineral oil as lubricant additive. The tribological properties of steelsteel contacts under the lubrication of 150SN base oil with diversity concentration of attapulgite clay powder are investigated on a standard Optimal SRV - IV tribometer. The elemental component and morphology on worn surface are analyzed by using scanning electron microscopy coupled with energy dispersive spectroscopy. The 150SN mineral oil containing 0.6% attapulgite clay reduces friction coefficient to 57.68% and the wear of steel ball lubricated by 150SN mineral oil containing 0.4% attapulgite clay is 14.52% as low as that lubricated by 150SN mineral oil Smooth and compact tribofilm composed of oxides is observed on the worn surface lubricated by 150SN mineral oil containing attapulgite clay. The layer - chain crystal structure of attapulgite clay and the complex physicochemical in friction process are responsible for the reduced friction and wear of the tribopair.