羟基硅酸镁和MoDTC复合添加剂的减摩抗磨性能
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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.
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.
引文
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[2]张嗣伟.我国摩擦学工业应用的节约潜力巨大:谈我国摩擦学工业应用现状的调查[J].中国表面工程,2008,21(2):50-52.ZHANG S W.Enormous economy potential of tribology application in industry in China:on the survey of present status of tribology application in industry[J].China Surface Engineering,2008,21(2):50-52.
[3]张祥,朱新河,冯晓辉,等.基于纳米氟化镧添加剂的润滑油摩擦学性能[J].大连海事大学学报,2017,43(1):126-130.ZHANG X,ZHU X H,FENG X H,et al.Tribological properties of lube added with lanthanum fluoride nanoparticles[J].Journal of Dalian Maritime University,2017,43(1):126-130.
[4]刘晴.含层状硅酸盐磨损自修复剂的减磨性能研究[D].北京:北京交通大学,2011.
[5]莫云辉.新型磨损自修复润滑剂的研制及其摩擦学特性和应用性研究[D].上海:上海大学,2010.
[6]屈孟男,姚亚丽,何金梅,等.减摩抗磨类新型润滑油添加剂的研究进展[J].化工进展,2016,35(7):2156-2165.QU M N,YAO Y L,HE J M,et al.Research progress of novel antifriction and antiwear lubricant additives[J].Chemical Industry and Engineering Progress,2016,35(7):2156-2165.
[7]郭志光,顾卡丽,徐建生,等.有机钼及其复合纳米润滑添加剂的摩擦磨损性能研究[J].摩擦学学报,2005,25(4):317-321.GUO Z G,GU K L,XU J S,et al.Friction and wear behavior of organic molybdenum and its composite with nano-particle antiwear additive[J].Tribology,2005,25(4):317-321.
[8]任洁.蛇纹石粉体的磨损自修复特性与机理研究[D].秦皇岛:燕山大学,2008.
[9]岳文.硅酸盐矿物微粒润滑油添加剂的摩擦学性能与磨损自修复机理[D].北京:中国地质大学(北京),2009.
[10]曹娟,张振忠,赵芳霞.超细蛇纹石粉体改善润滑油摩擦磨损性能的研究[J].润滑与密封,2007,32(12):53-55.CAO J,ZHANG Z Z,ZHAO F X.Study on tribological properties of the lubricating oil added with ultra-fine serpentine powders[J].Lubrication Engineering,2007,32(12):53-55.
[11]GRAHAM J,SPIKES H,KORCEK S.The friction reducing properties of molybdenum dialkyldithiocarbamate additives:Part I.factors influencing friction reduction[J].Tribology Transactions,2001,44(4):626-636.
[12]FISH G,JINSHENG E.The effect of friction modifier additives on CVJ grease performance[J].NLGLSpokeman,2002,66(7):22-30.
[13]YAN L,YUE W,WANG T,et al.Preparation and tribological properties of sulfur-and phosphorus-free organomolybdenum additive[J].Acta Petrolei Sinica,2012,28(5):851-857.
[14]SHI P J,XU B S,QIAO Y L,et al.Tribological behaviour of oil-soluble organo-molybdenum compound as lubricating additives[J].Transactions of Nonferrous Metals Society of China(English Edition),2004,14(S1):386-390.
[15]夏迪,陈国需,程鹏,等.油溶性有机钼作为多功能润滑油添加剂的性能研究[J].功能材料,2016,47(2):2154-2159.XIA D,CHEN G X,CHENG P,et al.Performance research of oil-soluble organic molybdenum as multifunctional additive in lubricant[J].Journal of Functional Materials,2016,47(2):2154-2159.
[16]史佩京,徐滨士,许一,等.二烷基二硫代磷酸钼与功能添加剂复合体系的摩擦学性能[J].润滑与密封,2006,31(3):1-3.SHI P J,XU B S,XU Y,et al.Tribological properties of the mixed system of molybdenum dialkyl dithiophosphate cambining with functional additive[J].Lubrication Engineering,2006,31(3):1-3.
[17]李新良.新型有机钼极压抗磨剂的合成及其应用性能研究[D].长沙:中南大学,2003.
[18]刘家浚,郭凤炜.一种摩擦表面自修复技术的应用效果及分析[J].中国表面工程,2004,17(3):42-45.LIU J J,GUO F W.The application and analysis of a new selfrepairing technology on the frictional surface[J].China Surface Engineering,2004,17(3):42-45.