【摘要】 为了改善轴承的摩擦学性能，将FeS微粒添加到基础脂中制成复合脂，在摩擦试验机上考察了复合脂在不同转速、载荷下的摩擦学性能.结果表明：添加到基础脂中的FeS微粒，在摩擦副的“挤压”作用下FeS微粒会不断地吸附在摩擦副表面上，从而形成吸附层.在摩擦瞬时高温的作用下，FeS微粒会发生分解，在摩擦副表面上生成FeS薄膜.FeS薄膜的疏松多孔结构易于储存基础脂中的润滑油并有利于O元素的扩散，能够促进FeS微粒的吸附和FeO、Fe₃O₄与FeSO₄薄膜的生成.在不同转速、载荷下，试样Ⅱ的耐磨性始终优于试样Ⅰ.在固定载荷为200 N,当转速为1.5 m/s和升高至3.0 m/s时，试样Ⅱ的磨损失重相对试样Ⅰ分别减少了14.28%和57.03%.在固定转速为2.1 m/s,载荷为150 N和增大到300 N时，试样Ⅱ的磨损失重相对试样Ⅰ分别减少了12.5%和84.85%.这归因于FeS微粒向摩擦副表面转移效果会随着转速的提高和载荷的增大而增强.更多还原

【Abstract】 In order to improve the tribological properties of bearings, a compound grease was prepared by mixing FeS particles with the base grease.The tribological performance of the composite grease under varying rotational speeds and loads was systematically investigated using a friction testing machine.The results indicate that FeS particles added to the base grease continuously adsorb on the friction pair surface under the "squeezing" effect induced by the friction pair, forming an adsorption layer.Under the action of instantaneous high temperatures generated during friction, FeS particles decompose and form FeS films on the surface of the friction pair.The loose and porous structure of these FeS films facilitates the retention of lubricating oil from the base grease and promotes the diffusion of O elements, which promotes the adsorption of FeS particles and the formation of FeO,Fe3O4 and FeSO4 films.Under different rotational speeds and loads, the wear resistance of sample II consistently outperforms that of sample I.Specifically, when the fixed load is 200 N and the rotational speed is 1.5 m/s and then increases to 3.0 m/s, the wear loss of sample II decreases by 14.28% and 57.03%,respectively, compared to sample I.Additionally, when the fixed rotational speed is 2.1 m/s and the load is 150 N and then increases to 300 N,the wear loss of sample II decreases by 12.5% and 84.85%,respectively, compared with that of sample I.These improvements are attributed to the fact that the transfer effect of FeS particles to the surface of the friction pair will be enhanced with the increase of speed and load.更多还原