纳米TiO2添加剂的摩擦学性能研究

采用油酸对纳米TiO2粒子进行了表面修饰,利用HQ-l摩擦磨损试验机和四球试验机考察了纳米TiO2的摩擦学性能,并探讨了其减摩抗磨机理.试验结果表明:适当添加修饰后的纳米TiO2,能有效提高400SN基础油的减摩抗磨性能和承载能力.     

石墨烯类润滑添加剂的研究进展

石墨烯具有良好的减摩抗磨性能,对其表面化学改性和纳米颗粒修饰可以提高其在润滑油中的性能。氮化硼、二硫化钨、二硫化钼等材料具有与石墨烯类似的二维结构,均是良好的固体润滑剂。综述了石墨烯类润滑油添加剂在摩擦学中的应用。     

纳米TiO2添加剂的摩擦学性能研究

采用油酸对纳米TiO2粒子进行了表面修饰，利用HQ-1摩擦磨损试验机和四球试验机考察了纳米TiO2的摩擦学性能，并探讨了其减摩抗磨机理。试验结果表明：适当添加修饰后的纳米TiO2，能有效提高400SN基础油的减摩抗磨性能和承载能力。     

纳米铜作润滑油添加剂的性能研究

研究了加入纳米铜添加剂的润滑油的摩擦学性能和主要理化性能.在XP-6数控摩擦磨损试验机和四球摩擦试验机上进行了纳米铜的摩擦学性能试验,结果表明,纳米铜对钢-钢摩擦副表现出良好的抗磨减磨性能,与未加添加剂的基础油相比,可使PB值提高34.95%,磨斑直径减少了56.8%,摩擦系数降低39.1%;理化试验表明,加入纳米铜后的基础油仍具有较好的理化特性.     

纳米铜作润滑油添加剂的性能研究

研究了加入纳米铜添加剂的润滑油的摩擦学性能和主要理化性能．在XP-6数控摩擦磨损试验机和四球摩擦试验机上进行了纳米铜的摩擦学性能试验,结果表明,纳米铜对钢-钢摩擦副表现出良好的抗磨减磨性能,与未加添加剂的基础油相比,可使Pa值提高34．95％,磨斑直径减少了56．8％,摩擦系数降低39．1％;理化试验表明,加入纳米铜后的基础油仍具有较好的理化特性．     

表面修饰SnS_2纳米粒子的合成及结构表征

利用表面修饰法合成了双十六烷基二硫代磷酸 (DDP)修饰的SnS2 纳米粒子 ,并用红外光谱(IR)、X -射线光电子能谱 (XPS)和透射电子显微镜 (TEM)等仪器对产物的结构、尺寸、形状及化学状态进行了研究 .结果表明 :表面修饰剂与纳米粒子表面之间发生化学键合作用 ,这使得SnS2 纳米粒子的油溶性得以明显改善 ,而且有效地阻止了纳米粒子之间的团聚现象 ,因而所合成的SnS2 纳米粒子大小均匀 ,粒径约为 7nm .     

超分散稳定纳米CuS的非水原位构筑及摩擦学性能

对超分散纳米粒子在润滑介质中的合成、分散和分散稳定，以及摩擦学性能进行了研究．首先设计并合成了油溶性铜盐和异氰酸酯类超分散剂；在添加油溶性铜盐和超分散剂的液体石蜡介质中，采用原位构筑方法获得了纳米CuS分散系，用冷冻蚀刻电镜对分散系进行了表征，通过离心实验对其分散稳定性进行了考察．其次利用环块摩擦试验机测定了纳米CuS分散系的摩擦学性能，并与空白油样进行了对比试验．结果表明：纳米CuS为粒径35nm左右的椭球形微粒，大小均匀，在介质中呈单粒子分散；纳米分散系经72h普通离心试验和56h非连续超离心试验均未发生相分离，表现出异乎寻常的分散稳定性；摩擦磨损试验显示超分散稳定纳米CuS的存在，可显著提高液体石蜡的承载能力和抗磨减摩性能；当纳米CuS质量分数为0．1％时，抗磨减摩性能最佳．     

Ni-PS-MoS2复合镀层的制备及摩擦磨损性能

用苯乙烯单体聚合反应法,在MoS2微粒表面包覆一层聚苯乙烯,经红外线光谱检测证明聚苯乙烯成功包覆在MoS2表面上.制备Ni-MoS2及Ni-PS/MoS2复合镀层试样,在镀液中微粒浓度相等的情况下,复合镀层中PS/MoS2微粒比MoS2微粒含量高.用扫描电镜观测复合镀层表面和截面彤貌,Ni-PS/MoS2复合镀层表面比Ni-MoS2复合镀层表面平整规则.在圆-盘式摩擦磨损试验机上进行复合镀层的摩擦磨损性能测试,结果表明制备工艺相同时,Ni-PS/MoS2复合镀层的摩擦学性能均优于Ni-MOS2复合镀层,镀液中微粒浓度25 g/L时,Ni-PS/MoS2复合镀层的摩擦学性能最好.     

纳米粒子在摩擦学领域的应用发展现状

介绍和总结了目前国内外纳米金属粒子和修饰的纳米粒子作为润滑油添加剂在摩擦学中的研究进展和发展趋势，并给出纳米粒子作添加剂的抗磨减摩机理，指出纳米粒子作为润滑油添加剂和填充粒子在摩擦学领域将起到重要作用。     

气溶胶OT 修饰的PbS 纳米粒子飞秒反饱和吸收

目的制备表面经AOT修饰的PbS纳米微粒,测定其超快非线性光学特性. 方法利用微乳液法制备表面经AOT修饰的PbS纳米微粒并利用飞秒激光技术研究其超快光学性质. 结果观察到超快反饱和吸收过程,弛豫时间约为100fs. 结论超快反饱和吸收来源于双激子效应和捕获载流子诱导的斯塔克效应,样品表面的化学修饰环境对超快非线性光学性质有很大的影响.     

表面修饰SnS2纳米粒子的合成及结构表征

利用表面修饰法合成了双十六烷基二硫代磷酸（DDP）修饰的SnS2纳米粒子,并用红外光谱（IR）、X-射线光电子能谱（XPS）和透射电子显微镜（TEM）等仪器对产物的结构、尺寸、形状及化学状态进行了研究,结果表明：表面修饰剂与纳米粒子表面之间发生化学键合作用,这使得SnS2纳米粒子的油溶性得以明显改善,而且有效地阻止了纳米粒子之间的团聚现象,因而所合成的SnS2纳米粒子大小均匀,粒径约为7nm。     

月桂酸铅的原位合成及摩擦学性能研究

在200SN矿物基础油中原位合成了油溶性月桂酸铅（LL）,并用FT－IR对其进行了结构表征,在高速低负荷和低速高负荷两种条件下,用四球摩擦磨损试验对LL和月桂酸（LA）进行了摩擦学性能评价,用往复式摩擦试验机对其抗磨减摩性能进行了考察。结果表明：月桂酸铅具有良好的抗磨性能、一定的减摩性能和中等的极压性能。为了解其抗磨减摩机理,用SEM及XPS研究了磨斑表面,发现摩擦学性能改善的原因在于LL在摩擦副表面形成吸附膜和在摩擦条件下部分吸附膜发生摩擦化学反应产生了铅氧化物膜。     

Microstructure and Tribological Behavior of Al_2O_3 Particle Reinforced Al Matrix Composites Fabricated by Spark Plasma Sintering

Nanoparticles and microparticles reinforced Al matrix composites were fabricated by spark plasma sintering, and the microstructure and tribological properties were investigated systemically. The nano-Al_2O_3 particle and micro-Al_2O_3 particle uniformly dispersed in Al matrix composites. The introduction of nanoparticles is beneficial to the decrease of friction coefficient and wear rate, while microparticles are responsible to the high friction coefficient, resulting in the abrasive wear. With the introduction of both nanoparticles and microparticles, their synergic effect will lead to the variation of tribological behavior.     

Design of wear-out-failure in-situ repair parts by environment-friendly nanocopper additive

Oleic acid surface-modified Cu nanoparticles with an average size of 20 nm were prepared by liquid phase reducing reaction. The tribological performance and mechanism of nanocopper as additive were studied by means of tribotester, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and nanoindentation instrument. The results indicate that the modified nanocopper additive can significantly improve the wear resistance and reduce friction coefficient of base oil. A copper protective film is formed and contributes to the excellent tribological properties of nanocopper additive. On the basis of the film forming mechanism, a new in-situ repair method was designed and used to repair wear-out-failure injection pump plunger and barrel. Furthermore, the current research progress of nanoparticles as green energy-saving lubricating oil additives were presented.     

Synthesis of γ-AlOOH Nanoparticle and Its Tribological Properties as Additives in Liquid Paraffin

An experiment procedure was presented for the synthesis of γ-AlOOH nanoparticles by a dehydration process which employed the solution of H₂O₂ as dehydrator. The phase and morphology of the product were investigated by XRD and TEM. The tribological properties of γ-AlOOH nanoparticles with the average diameter of 15?nm as additives in liquid paraffin were investigated by a four-ball tester, and the worn surfaces were analyzed by SEM and EDS. Results show that the average size of synthesized γ-AlOOH nanoparticles increases with the increase of the pH value and temperature of the reactant. The γ-AlOOH nanoparticles as additives could exhibit good tribological properties due to their covering effect, which prevents the direct contact of asperities and reduces the adhesion. As the real area of contact decreases with the decrease of applied load, the optimum concentration varies from 0.4% to 0.1% when the applied load decreases from 294?N to 200?N.     

Design of wear-out-failure in-situ repair parts by environment-friendly nanocopper additive

Oleic acid surface-modified Cu nanoparticles with an average size of 20 nm were prepared by liquid phase reducing reaction. The tribological performance and mechanism of nanocopper as additive were studied by means of tribotester, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and nanoindentation instrument. The results indicate that the modified nanocopper additive can significantly improve the wear resistance and reduce friction coefficient of base oil. A copper protective film is formed and contributes to the excellent tribological properties of nanocopper additive. On the basis of the film forming mechanism, a new in-situ repair method was designed and used to repair wear-out-failure injection pump plunger and barrel. Furthermore, the current research progress of nanoparticles as green energy-saving lubricating oil additives were presented. Foundation item: Project (50235030) supported by the National Natural Science Foundation of China     

Comparison of tribological properties for graphite coatings used for remanufacturing

To improve the solid lubricity on the worn surface of frictional-pairs, a convenient and simple brush-painting technique was utilized to prepare the solid lubrication graphite coatings. The bonding between the coatings and substrate is good. To examine the influence of the different graphite contents on the tribological properties of the graphite coatings, the comparison experiments were carried out on the ring-on-block friction tester. The tribological results show a change law of saddle-shape between the tribological properties of graphite coatings and graphite content. When the amount of graphite is up to 28 g, the tribological properties of graphite coating are the best. The excellent anti-friction of the graphite coating is associated with the close-packed hexagonal crystal structure of graphite.     

含纳米SiO2锂基润滑脂流变学与摩擦学性能

利用SG65三辊研磨机制备了含不同粒径和不同质量浓度SiO₂纳米颗粒的锂基润滑脂. 通过MRS-1J机械式四球长时抗磨损试验机及安东帕MCR301流变仪研究了SiO₂纳米颗粒作润滑脂添加剂的摩擦学性能和流变学性能. 结果表明,SiO₂纳米颗粒粒径为30 nm、质量浓度为4%时润滑脂摩擦学系数最小,抗磨减摩性能最好. 在中低剪切速率下对流变试验数据进行拟合,提出了含纳米颗粒质量浓度参数的润滑脂改进型流变模型. SiO₂纳米添加剂可改善锂基润滑脂触变性,提高润滑脂抗剪切能力和热稳定性能.     

Effects of combined additions of SiO2 and MoS2 nanoparticles as lubricant additive on the tribological properties of AZ31 magnesium alloy

The tribological properties of combinative addition of nano-MoS_2 and nano-SiO_2 to the base oil have been investigated with a reciprocating ball-on-plate tribotester for magnesium alloy–steel contacts. The results demonstrate that the optimum mass ratio of nano-SiO_2 to nano-MoS_2 is 0.25:0.75. The optimum combinative addition into the base oil reduces the friction coefficient by 43.8% and the surface roughness(Sa) by 31.7% when compared to that found with the base oil. Meanwhile, the combinative addition of nano-MoS_2 and nano-SiO_2, in comparison with single nanoparticles addition, is more pronounced in terms of the lubrication film stability. The excellent tribological properties of the SiO_2/MoS_2 combinations are attributed to the formation of physical adsorption films and tribochemical products during the rubbing process and the micro-cooperation of various nanoparticles with different shapes and lubrication mechanisms.