ZDDP润滑铜摩擦副表面膜的机制

运用摩擦学实验与表面分析相结合的方法,考察了以二烷基二硫代磷酸锌（ＺＤＤＰ）润滑的铜摩擦副表面膜,分析了表面膜中主要元素的存在状态和ＺＤＤＰ的减摩作用机制,研究结果表明：ＺＤＤＰ在铜摩擦副表面形成了由有机化合物和无机化合物共存的反应膜,该膜具有良好的减摩抗磨性能,可有效减小摩擦磨损;此外,ＺＤＤＰ还可通过对摩擦副表面的改性,增强其减摩抗磨性能。     

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。     

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.     

稀土—偶氮氯膦—mN溴化十六烷基三甲基胺胶束增溶光度法测定铈组稀土元素

本文研究了稀土—偶氮氯膦mN—溴化十六烷基三甲基胺胶束增溶体系的分光光度特性。在HCl—H2C2O4—C2H5OH介质中,铈组稀土络合物的最大吸收波长为672nm,对铈来说,表观摩尔吸光系数ε=1.6×105l·mol-1·cm-1,比相应二元络合物提高二倍多,方法选择性好。增加比色皿厚度,可测定低     

硼酸盐添加剂的抗磨机理研究

通过在环块式磨损试验机和点接触摩擦磨损试验机上对加入硼酸盐添加刘的润滑油进行了边界润滑下摩擦学参数的测量和分析,并用俄歇电子能谱(AES)对磨痕表面进行了元素成分及其相对原子浓度比的分析,证实了硼酸盐添加剂具有较小的减摩作用和良好的抗磨性能;发现磨痕表面元素的相对原子浓度比随着摩擦条件的变化而变化。研究认为,硼酸盐添加剂的抗磨性能主要是由于硼酸盐粒子吸附和/或沉积在金属表面上的微球润滑层和易在表面生成化学反应膜所引起。     

水溶性无机盐对水基抗磨剂的润滑性能影响的研究

合成了几种水溶性烷基酚聚氧乙烯醚磷酸酯金属络合物(ZnP-1,LaP-1,CeP-1)抗磨剂,利用四球机试验考察了其在水中的润滑性能,并且研究了水溶性无机盐对该类抗磨剂在水中的磨擦学性能的影响。结果表明,在水介质中无机盐的阴、阳离子对其磨擦学性能具有不同程度的影响。阳离子对其承载能力的影响不大,而阴离子对其承载能力则有较大的影响。阴、阳离子对抗磨剂的抗磨性能亦有一定的影响。     

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。     

稀土—烷基膦酸单烷基酯的抗磨性能研究

采用四球摩擦磨损试验机对稀土元素Ｌａ、Ｐｒ、Ｓｍ和Ｇｄ与２－乙基已基膦酸单（２－乙基已基）酯（简称ＨＥＭＰ）的萃合物（简称ＲｅＥＭＰ）的抗磨性能进行评价，并用扫描电子显微镜（ＳＥＭ）和俄歇电子能谱（ＡＥＳ）方法，研究了ＲｅＥＭＰ的抗磨机理。结果表明，ＲｅＥＭＰ在润滑油中具有较好的抗磨性能，其原因一方面是在摩擦表面生成含稀土元素及磷元素的表面保护膜，另一方面是在摩擦亚表面形成含稀土元素的摩擦扩散层而使材料耐磨性提高。ＲｅＥＭＰ抗磨性能的提高可明显提高油品的最大无卡咬负荷和降低磨斑直径。     

DDP修饰PbO纳米微粒的摩擦学性能研究

合成了分散性良好 ,粒径约为 5nm的二烷基二硫代磷酸 (DDP)修饰PbO纳米微粒 ,并用四球摩擦磨损试验机考察了其作为润滑油添加剂的摩擦学行为 .结果表明 ,DDP修饰PbO纳米微粒在极低的添加浓度下即具有良好的抗磨效果 ,但是却不能降低基础油的摩擦系数 .摩擦过程中在摩擦表面产生的PbO沉积膜对其摩擦学性能起了主要贡献     

含氮硼酸酯的合成及其在菜籽油中摩擦学性能研究

合成了一种新型的含氮硼酸酯,并利用红外光谱对其主要官能团进行了鉴定．通过四球试验机考察了其在菜籽油中的摩擦学性能,并采用扫描电子显微镜观察分析钢球磨斑表面形貌．结果表明,含氮硼酸酯具有较好的极压、抗磨减摩性能,且在菜籽油中的最佳添加量为3％;含氮硼酸酯较菜籽油能明显减轻钢球表面磨损．     

表面修饰氟化镧微粉的制备及极压性能研究

以硝酸镧、氟化氨等为原料，经溶液反应及适当的修饰工艺制备了表面修饰氟化镧微粉。将所制备的微粉作为极压抗磨剂，以四球实验测试了氟化镧微粉的最大无卡咬负荷（pB）及磨痕直径（D）。结果表明，经表面修饰的氟化镧微粉具有较好的极压抗磨性能，其极压性能优于目前普遍使用的极压抗磨剂二烷基二硫代磷酸锌ZnDDP。以扫描电子显微镜（SEM）、X射线光电子能谱（XPS）观察和分析了蚀球磨痕形貌及磨痕表面的化学成分，在摩擦过程中氟化镧微粉与摩擦副表面发生摩擦化学反应，生成了由氧化镧、氧化铁等组成的边界润滑膜，是此类极压抗磨剂具有较好的极压性能的主要原因。     

The Lubricating Effectiveness of S-Mo Extreme Pressure Additive and Its Anti-wear Mechanism

A kind of novel compound containing S and Mo elements was synthesized. Its chemical structure was characterized by elemental analysis, IR and 3MR. hs anti-wear property and the load-carrying capacity, as an extreme pressure （EP） additive of lubricating oil, were investigated using a four-bull tester. The experimentul results show that the additive exhibits a superior anti-wear property and a high load-carrying capacity . The presence of other additives does not interfere with the anti-wear prnperty of the extreme pressure additive. The influences of load and temperature on the propert） of the additive were examined. The possible mechanism uas investigated by means of sufface analysis of the tested steel ball specimen , using XPS. The lubricatian films formed on the rubbing surface are mainly composed of MoS2, MoO3 and MoO2.     

The friction and wear characteristics and lubrication mechanism of imidazole phosphate ionic liquid

Several imidazole phosphate ionic liquids with varying carbon chain length have been synthesized at room temperature. Corrosion characteristics and tribological properties of these synthesized ionic liquids were studied using four-ball friction and wear testing machine. Its lubrication mechanism was also investigated by means of electron microscopy and X-ray photoelectron spectroscopy. The experimental results showed that no corrosion was generated when the imidazole phosphate ionic liquid was applied to steel-steel pair. Meanwhile, the imidazole phosphate showed excellent anti-wear and lubricating performances, its frictional performance was related to the polarity of ionic liquids. It is suggested that the ionic liquids react with friction surface to form a protective film of iron phosphate and result in reduction in friction and wear. Supported by the National Natural Science Foundation of China (Grant Nos. 50721062 and 20533080) and the National Basic Research Program of China (973 Program) (Grant No. 2007CB607606)     

Assessment model for tribological property of ceramic/stainless steel rubbing pairs in H2O2 solution

The tribological properties of ZrO2 ceramic and 1Cr18Ni9Ti stainless steel rubbing pairs were investigated using a special tribo-tester under different concentrations of hydrogen peroxide (H2O2) solution.The comparison analyses of the friction coefficients,worn volume rates,worn particles and surface roughness were conducted under the tested conditions.There were significant differences of the tribological properties of the rubbing pairs in the different concentrations H2O2 solution because of oxidation and corrosion.This research has revealed that the main wear mechanisms between the rubbing pairs are severe adhesive wear,abrasive wear and corrosive wear in the H2O2 solution with different concentrations.A model has been established to assess the most suitable concentration of the H2O2 solution for the tribological properties of the rubbing pairs.The result shows that 50% concentration of the H2O2 solution is the most suitable.The assessment result is consistent with the experimental result.It is believed that the knowledge gained in this study is useful for the optimization of the friction pairs in the extreme condition.     

Tribological characteristics and self-repairing effect of hydroxy-magnesium silicate on various surface roughness friction pairs

Tribological characteristics and self-repairing effect of hydroxy-magnesium silicate (HMS) dispersed in lubricant oil on steel-to-steel friction pairs with various surface roughness were analyzed. The friction-reduction, anti-wear and self-repairing performance of various surface roughness friction pairs were examined by friction testing machine. An operation comparison was made between SJ10W-40 lubricant with and without HMS. The surface morphology and elementary composition of the grinding cracks were analyzed by scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). The results show that the lubrication state changes from boundary lubrication into mixed lubrication after operation in lubricant with HMS. The friction-reduction, anti-wear and self-repairing performance of the friction pairs with various surface roughness are distinctly different. There is a repairing film whose material is different from substrate material on the grinding cracks. In addition, Si, Mg, O, Al and other elements are deposited on the repairing film which contains nanocrystals of these elements. And HMS self-repairing material possesses superior performance of friction-reduction, anti-wear and self-repairing effects.     

Tribological performance of TiAlSiN and TiAlCrN/TiAlN coating blades

A new laboratory evaluation method for the coating blade was developed, and the tribological properties of coating blades with different Ti-based coatings were studied by UMT-2 tribometer. Comparison between the areas of scratches before and after the cutting experiment was used to evaluate the cutting performance of the blades. Results showed that friction coefficient of TiAlCrN / TiAlN coating was significantly lower than that of TiAlSiN coating. Analysis of the worn surface revealed that the TiAlSiN and TiAlCrN / TiAlN coatings in the dry turning process exhibited sign of inhomogeneous adhesive wear and abrasive wear. TiAlCrN/TiAlN coating has a longer working life and better anti-wear property because of its duplex coating.     

纳米烟炱颗粒作为添加剂在激光刻蚀织构表面 的摩擦学性能研究

通过激光刻蚀法制备不同织构表面,在UTM-2摩擦磨损试验机,采用球-面接触方式往复运动,考察了纳米烟炱颗粒作为润滑油添加剂的摩擦磨损性能。借助高分辨透射电镜、三维轮廓仪、扫描电镜和拉曼光谱仪等测试设备,分析了其纳米烟炱颗粒在织构表面的摩擦学机理。结果表明: 部分织构会增加摩擦系数,但磨损率却显著减小;织构的面积率越高,抗磨性能越优异。纳米烟炱颗粒加入后,试样的磨损明显减轻,这归因于烟炱颗粒的自润滑性能以及织构微坑储存纳米颗粒、润滑油的功能。表面织构与纳米烟炱颗粒的共同耦合作用展现出了优异的抗磨减摩性能。     

新型聚羧酸系外加剂合成工艺研究

通过确定不同的引发剂用量、聚乙二醇投入量、聚氧化乙烯侧链长度以及酯化反应的温度和时间，对所合成的新型聚羧酸系外加剂的性能进行比较。试验结果表明，在新型聚羧酸系外加剂的合成过程中，存在着最佳范围的引发剂用量、聚乙二醇投入量、聚氧化乙烯侧链长度和最佳的酯化反应温度和时间，优化了新型聚羧酸外加剂的合成工艺。