含纳米介孔SiO_2锂基润滑脂摩擦学与流变学性能研究
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摘要
利用具有不同形貌和孔道结构的纳米介孔Si O_2作为添加剂,制备了含纳米介孔Si O_2的锂基润滑脂,采用Anton-paar NHT3纳米压痕测试仪和Anton-paar MCR302旋转流变仪考察了纳米介孔Si O_2形貌、孔道结构以及质量分数对锂基润滑脂摩擦学性能和流变学性能的影响.结果表明:球状的纳米介孔Si O_2添加剂能更有效降低锂基润滑脂的摩擦系数,增强锂基润滑脂的骨架稳定性,改善锂基润滑脂触变性,提高润滑脂的抗剪切能力以及热稳定性能.在中低剪切速率下对流变试验数据进行拟合,提出了基于纳米介孔Si O_2添加剂温度和质量分数参数的润滑脂改进型流变模型.
Lithium lubricating grease containing nano-mesoporous SiO_2 was prepared by using SiO_2 with different morphologies and pore structures as additive. The effects of morphology,pore structure and mass concentration of nanomesoporous SiO_2 on tribological properties and rheological properties of lithium grease were investigated by Anton-paar NHT3 nano-indentation tester and Anton-paar MCR302 rotary rheometer. The results show that the spherical nanomesoporous SiO_2 additive reduced the tribological coefficient more effectively, strengthened the skeleton stability,enhanced the thixotropy, anti-shear ability and thermostability of greases. Under low and moderate shear rate, the rheological experimental data was fitted, and a new grease rheological model was proposed, containing nanoparticals mass concentrations parameter.
Lithium lubricating grease containing nano-mesoporous SiO_2 was prepared by using SiO_2 with different morphologies and pore structures as additive. The effects of morphology,pore structure and mass concentration of nanomesoporous SiO_2 on tribological properties and rheological properties of lithium grease were investigated by Anton-paar NHT3 nano-indentation tester and Anton-paar MCR302 rotary rheometer. The results show that the spherical nanomesoporous SiO_2 additive reduced the tribological coefficient more effectively, strengthened the skeleton stability,enhanced the thixotropy, anti-shear ability and thermostability of greases. Under low and moderate shear rate, the rheological experimental data was fitted, and a new grease rheological model was proposed, containing nanoparticals mass concentrations parameter.
引文
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[2]Wang Libo,Feng Dapeng,Liu Weimin.Tribological properties of a steel-steel pair under the lubrication of lithium grease containing various nano-particulates as additives[J].Tribology,2005,25(2):107-111(in Chinese)[王李波,冯大鹏,刘维民.几种纳米微粒作为锂基脂添加剂对钢-钢摩擦副摩擦磨损性能的影响研究[J].摩擦学学报,2005,25(2):107-111].doi:10.3321/j.issn:1004-0595.2005.02.003.
[3]Yang Shanlin,Qiao Yulin,Cui Qingsheng,et al.The effect of ultrasonic vibration on tribological performance with n-Si O2additives[J].Tribology,2012,32(4):390-395(in Chinese)[杨善林,乔玉林,崔庆生,等.超声振动对纳米二氧化硅(n-Si O2)添加剂减摩抗磨性能的影响[J].摩擦学学报,2012,32(4):390-395].doi:10.16078/j.tribology.2012.04.008.
[4]Ge X,Y Xia,Z Cao.Tribological properties and insulation effect of nanometer Ti O2 and nanometer Si O2 as additives in grease[J].Tribology International,2015,92:454-461.doi:10.1016/j.triboint.2015.07.031.
[5]Chen Hanlin,Chen Guoxu,Du Pengfei,et al.Tribology of nanotungsten disulfide powder as an lubricating additive for lithium grease[J].Tribology,2015,35(6):651-657(in Chinese)[陈汉林,陈国需,杜鹏飞,等.二硫化钨纳米粉体作为锂基润滑脂添加剂的摩擦学研究[J].摩擦学学报,2015,35(6):651-657].doi:10.16078/j.tribology.2015.06.001.
[6]Hu E Z,Xu Y.Tribological properties of 3 types of Mo S2 additives in different base greases[J].Lubrication Science,2017,29:541-555.doi:10.1002/ls.v29.8.
[7]Zhang Bo,Xu Binshi,Xu Yi,et al.Research status of micro-and nano-materials in lubricating additives[J].Tribology,2011,31(2):194-204(in Chinese)[张博,徐滨士,许一,等.润滑剂中微纳米润滑材料的研究现状[J].摩擦学学报,2011,31(2):194-204].doi:10.16078/j.tribology.2011.02.015.
[8]Yi Shuli,Yu Guoxian,Zhou Xiaolong,et al.Effect of dispersivity and stability of La F3 nanoparticles in lubricating oils on their tribological properties[J].Journal of East China University of Science&Technology,2006,(12):1392-1395(in Chinese)[易书理,余国贤,周晓龙,等.纳米La F3在润滑油中的分散稳定性对其摩擦学性能的影响[J].华东理工大学学报,2006,(12):1392-1395].doi:10.3969/j.issn.1006-3080.2006.12.005.
[9]Cao Zhi,Li Xiaohong,Zhang Zhijun,et al.Effect of Si O2nanoparticles as additive on antiwear and extreme pressure properties of lithium grease[J].Tribology,2005,25(5):390-393(in Chinese)[曹智,李小红,张治军,等.表面修饰Si O2纳米微粒对锂基脂抗磨性能影响的研究[J].摩擦学学报,2005,25(5):390-393].doi:10.3321/j.issn:1004-0595.2005.05.002.
[10]Huo Yuqiu,Yan Yutao,Liu Xiaoxia,et al.Preparation and tribological properties of monodispersed nano-Si O2 particles as additive in lubricating oil[J].Tribology,2005,25(1):34-38(in Chinese)[霍玉秋,闫玉涛,刘晓霞,等.单分散纳米Si O2的制备及其作为润滑油添加剂的摩擦学性能研究[J].摩擦学学报,2005,25(1):34-38].doi:10.3321/j.issn:1004-0595.2005.01.007.
[11]Li X.Surface-modification in situ of nano-Si O2 and its structure and tribological properties[J].Applied Surface Science,2006,252(22):7856-7861.doi:10.1016/j.apsusc.2005.09.068.
[12]Zhang Feng,Qi Haiyang,Song Baoyu,et al.Rheological properties of lithium grease containing nano-particles[J].Lubrication Engineering,2010,35(11):9-13(in Chinese)[张锋,祁海洋,宋宝玉,等.含纳米微粒锂基脂流变性及影响因素分析[J].润滑与密封,2010,35(11):9-13].
[13]Liu Jianping,Xu Bingbing,Xu Zhifang.Rheological and tribological properties of lithium grease containing nano silica[J].Journal of Beijing University of Posts and Telecommunications,2016,39(4):71-76(in Chinese)[刘剑平,徐兵兵,徐志方.含纳米Si O2锂基润滑脂流变学与摩擦学性能[J].北京邮电大学学报,2016,39(4):71-76].
[14]Liu S.Aggregation morphologies of a series of heterogemini surfactants with a hydroxyl head group in aqueous solution[J].Soft Matter,2014,10(45):9177.doi:10.1039/C4SM01524J.
[15]St?ber,W A Fink,E Bohn.Controlled growth of monodisperse silica spheres in the micron size range[J].Journal of Colloid and Interface Science,1968,26(1):62-69.doi:10.1016/0021-9797(68)90272-5.
[16]Valentin R A,Radulescu I.Rheological models for lithium and calcium greases[J].Mechanika,2016,59(3):67-70.