层片状纳米粒子对绿色润滑油润滑特性的影响
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摘要
针对绿色植物油高温润滑性能差的问题,通过四球摩擦实验研究了层片状纳米粒子(纳米WS2、纳米MoS2和纳米石墨)在不同工况(温度、负载和速度)下对菜籽油润滑特性的影响。结果表明:层片状纳米粒子可有效提高菜籽油的极压性能和各工况下的抗磨减摩性能,可显著减轻高温下摩擦表面的磨损,改善磨损表面形貌,使磨损表面粗糙度降低75.5%~87.1%,从而延长菜籽油的服役寿命和摩擦副的使用寿命;其中纳米WS2的改善效果最佳,可使最大无卡咬负荷和烧结载荷分别提高13.4%和66.7%,使菜籽油的磨斑直径和摩擦因数在常温(25℃)下分别减小25.8%和8.3%,在高温(250℃)下分别减小48.3%和21.9%,并且含纳米WS2润滑油的抗磨减摩性能随温度、负载和速度的变化幅度最小,这主要缘于纳米WS2具有比纳米石墨更高的金属表面吸附能力,并具有比纳米MoS2更好的耐高温性能。
In view of the poor lubricating properties of green vegetable oil at high temperature,effects of nanometer flakes on lubricating properties of rapeseed oil under different working conditions were studied through four-ball friction experiments.The results show that nanometer flakes improve lubricating properties of rapeseed oil effectively and alleviate abrasion of friction surface,which reduces the surface roughness by 75.5%-87.1%.Thereinto,the improvement effect of nano-WS2 exceeds that of nano-MoS2 and nano-graphite,and nano-WS2 improves the maximum non-seizure load of rapeseed oil by 13.4% and weld load by66.7%,and reduces the wear scar diameter and friction coefficient by 25.8%,8.3% at 25 ℃ and by 48.3%,21.9% at 250 ℃respectively.In addition,the variation of nano-WS2oil's lubricating properties with temperature,load,speed is the smallest.All of these result from the nano-WS2 's stronger adsorbability than nano-graphite and better thermostable performance than nano-MoS2.
In view of the poor lubricating properties of green vegetable oil at high temperature,effects of nanometer flakes on lubricating properties of rapeseed oil under different working conditions were studied through four-ball friction experiments.The results show that nanometer flakes improve lubricating properties of rapeseed oil effectively and alleviate abrasion of friction surface,which reduces the surface roughness by 75.5%-87.1%.Thereinto,the improvement effect of nano-WS2 exceeds that of nano-MoS2 and nano-graphite,and nano-WS2 improves the maximum non-seizure load of rapeseed oil by 13.4% and weld load by66.7%,and reduces the wear scar diameter and friction coefficient by 25.8%,8.3% at 25 ℃ and by 48.3%,21.9% at 250 ℃respectively.In addition,the variation of nano-WS2oil's lubricating properties with temperature,load,speed is the smallest.All of these result from the nano-WS2 's stronger adsorbability than nano-graphite and better thermostable performance than nano-MoS2.
引文
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[3] 张思国,胡志峰,张晖,等.高性能柴油机润滑系统设计与分析[J].内燃机,2013,29(1):19-21.Zhang Siguo,Hu Zhifeng,Zhang Hui,et al.Design and analysis of high performance diesel engine lubricating system[J].Internal Combustion Engines,2013,29(1):19-21.(in Chinese)
[4] Zhang Gengyun,Wang Xudong,Chen Manqing,et al.Investigation on the effect of lubricating-oil temperature on deceleration process of the diesel engine[J].Journal of China Ordnance,2009,5(4):252-255.
[5] López J A B,Monsivais A T,Galvez C G,et al.Thermal characterization of vegetable oils by means of photoacoustic techniques[J].Revista Mexicana de Fisica,2013,59(1):168-172.
[6] Machado Y L,Neto A A D,Fonseca J L C,et al.Antioxidant stability in vegetable oils monitored by the ASTM D7545method[J].Journal of the American Oil Chemists’Society,2014,91(7):1139-1145.
[7] Hashem A I,Abou E W S L,Salem A E.Conversion of some vegetable oils into synthetic lubricants[J].Energy Sources,Part A:Recovery,Utilization,and Environmental Effects,2013,35(5):397-400.
[8] 里伟,杜伟,刘德华.叔丁醇介质体系中R.oryzae细胞催化大豆油制备生物柴油的研究[J].中国科技论文在线,2008,3(3):170-175.Li Wei,Du Wei,Liu Dehua.R.oryzae whole cell-catalyzed methanolysis of soybean oil for biodiesel production in tert-butanol system[J].Sciencepaper Online,2008,3(3):170-175.(in Chinese)
[9] Tim C.Solid lubricants-solid hold in global industry[J].Lubricants World,2003,13(9):28-31.
[10]Gaskell A.Molybdenum disulfide:new life for old technology[J].Lubricants World,2003,13(1):40-43.
[11]石琛,毛大恒,李登伶.行车实验中纳米WS2粉末的节能减排特性[J].粉末冶金材料科学与工程,2010,15(5):530-537.Shi Chen,Mao Daheng,Li Dengling.Energy save and exhaust reduction performances of nano-WS2 particulates in road travel test[J].Materials Science and Engineering of Powder Metallurgy,2010,15(5):530-537.(in Chinese)
[12]石琛,毛大恒,毛向辉.纳米WS2颗粒润滑材料的节能环保效果[J].粉末冶金材料科学与工程,2011,16(4):617-624.Shi Chen,Mao Daheng,Mao Xianghui.Energy saving and environmental protection characteristics of lubricant material adding with nanometer WS2 particulates[J].Materials Science and Engineering of Powder Metallurgy,2011,16(4):617-624.(in Chinese)
[13]Shi Chen,Mao Daheng,Feng Hao.Preparation of tungsten disulfide motor oil and its tribological characteristics[J].Journal of Central South University of Technology,2007,14(5):673-678.
[14]马国光.“驰凯牌”节能减摩王添加剂的研制及其价值[J].润滑油,1994,9(4):42-44.Ma Guoguang.Development of the king of saving on energy and antifriction additive of“chikai”and its value[J].Lubricating Oil,1994,9(4):42-44.(in Chinese)
[15]石琛,毛大恒,毛艳,等.纳米WS2的多能场复合细化制备与影响因素[J].华中科技大学学报:自然科学版,2012,40(S2):35-38.Shi Chen,Mao Daheng,Mao Yan,et al.Compound grinding preparation of nano-WS2in multi-energy field and its influencing factors[J].Journal of Huazhong University of Science and Technology:Natural Science Edition.2012,40(S2):35-38.(in Chinese)
[16]Shi Chen,Mao Daheng,Zhou Ming.Dispersion effect and Auto-reconditioning performances of nanometer WS2Particles in green lubricant[J].Bulletin of Materials Science,2010,33(5):529-534.