羟基硅酸镁和MoDTC复合添加剂的减摩抗磨性能  

Tribological Properties of Compound Additives of Magnesium Silicate Hydroxide Superfine Powder and MoDTC in Lubricating Oil Additives

作　　者：张宇 严志军[1] 朱新河[1] 程东[1] 刘东妮 闫学良 ZHANG Yu;YAN Zhijun;ZHU Xinhe;CHENG Dong;LIU Dongni;YAN Xueliang(Marine Engineering College,Dalian Maritime University,Dalian Liaoning 116026,China)

机构地区：[1]大连海事大学轮机工程学院,辽宁大连116026

出　　处：《润滑与密封》2018年第6期18-22,29,共6页Lubrication Engineering

基　　金：国家自然科学基金面上项目(51779023);中央高校基本科研业务费专项资金项目(3132016337)

摘　　要：采用MMW-1A型立式万能摩擦磨损试验机分别考察羟基硅酸镁超细粉体以及羟基硅酸镁超细粉体复合MoDTC作为基础油PAO4添加剂的摩擦学性能,借助金相系统显微镜、扫描电子显微镜(SEM)以及能量色散谱仪(EDS)对摩擦表面进行观察表征及组成分析。结果表明:羟基硅酸镁超细粉体可改善PAO4的减摩抗磨性能,但摩擦表面仍存在明显划痕及凹坑;质量分数0.25%的羟基硅酸镁超细粉体与0.3%的MoDTC组成的复合添加剂,可明显改善PAO4的减摩抗磨性能,相比于PAO4基础油和仅添加质量分数0.25%的羟基硅酸镁超细粉体的润滑油,摩擦因数分别降低了32.75%和17.87%,磨斑直径分别下降了53.16%和32.04%;复合添加剂对磨斑表面形貌的改善效果更为显著,其在摩擦表面形成了一层富含C、O、Mo、S、Mg、Si等元素的修复层,且2种添加剂在摩擦过程中优势互补,起到了相互促进的协同作用。Tribological properties of magnesium silicate hydroxide superfine powder additive and the compound additives of magnesium silicate hydroxide superfine powder and MoDTC in PAO4 base oil were studied on the MMW-1 A type vertical universal friction and wear tester.The friction surfaces were observed,characterized and analyzed by means of metallographic microscope,SEM and EDS.The results show that the magnesium silicate hydroxide superfine powder can improve the friction and anti-wear properties of PAO4 base oil,but there are still obvious scratches and pits on the frictional surface.The compound additives composed of 0. 25% magnesium silicate hydroxide superfine powder and 0. 3% MoDTC can obviously improve the tribological properties of PAO4 base oil,copmared with PAO4 base oil and the base oil with single additive of magnesium silicate hydroxide superfine powder,the friction coefficient is reduced by 32. 75% and 17. 87%,respectively,while the wear scar diameter is reduced by 53. 16% and 32. 02%,respectively.The compound additives have significant effect on improving the worn surface morphology,which can form a repairing layer composed of C,O,Mo,S,Mg and Si elements on the friction surfaces.The two kinds of additives complement each other during the friction process and play a synergistic role in promoting each other.

关 键 词：羟基硅酸镁 超细粉体 MODTC 减摩抗磨性能 润滑油添加剂 

分 类 号：TH117.1[机械工程—机械设计及理论]