二硫代磷酸硫化氧钼与硫,磷添加剂的复配特性研究

研究了二烷基二硫代磷酸硫化氧钼（ＭｏＤＴＰ）摩擦改进剂及其与硫、磷、硫－磷型添加剂复合的抗磨减摩性能。试验表明，经过适当复配后，这类合活性元素的添加剂对ＭｏＤＴＰ的抗磨减摩性能均有增效作用，同一类型添加剂的活性愈高，增效作用愈显著。同时利用扫描电镜和Ｘ－射线能谱仪进行摩擦副表面膜的形貌照相及元素分析，对复合作用的机理进行了初步探讨。     

噻二唑二聚物/丁氧基三乙二醇复合物的合成

合成了噻二唑二聚物/丁氧基三乙二醇复合物。反应物的摩尔比及反应温度影响产物作为添加剂加入到润滑脂中的抗烧结性能。在最佳反应条件下,即n(噻二唑二聚物)∶n(丁氧基三乙二醇)=0.5∶1.0,反应温度125℃时,产率为85%。通过分子模拟、红外光谱、13C核磁共振及N、S元素的含量测定,探讨了产物的结构及反应机理。结果表明,噻二唑二聚物与丁氧基三乙二醇的摩尔比越大,在金属表面形成配位的噻二唑环的个数就越多,就会表现出更强的吸附特性,从而表现出更高的抗烧结性能。     

二烷基二硫代氨基甲酸镉的合成及应用研究

合成了润滑油添加剂二戊基二硫代氨基甲酸镉,利用四球试验机研究了其在矿物基础油中的极压、抗磨性能,以及与二烷基二硫代磷酸锌(T202)有机硼酸酯和磷酸三苯酯添加剂之间的抗磨协同性能。结果表明,此添加剂体现出了较好的抗磨性能和承载能力,并且与两种硼酸酯都体现出了良好的抗磨协同性能。另外,通过箱热氧化试验简单评价了其抗氧化性能,结果表明,该添加剂具有良好的高温抗氧化性能。     

纳米粒子对钢/钢摩擦副摩擦学性能影响的试验研究

选用合成极压蜗杆油、未加油性剂和极压剂的半成品蜗杆油作为基础试验油 ,将超微金刚石粉、纳米铁粒子和纳米铜粒子分别以两种不同质量比分散到半成品蜗杆油中。在 MM-2 0 0型磨损实验机上 ,考察纳米粒子的抗磨减摩性 ,并与传统的油性剂、极压剂进行比较。同时探索应用于钢 /钢副硬齿面的新型抗磨减摩添加剂。试验结果发现 :平均粒径尺寸为 5 nm的超微金刚石粉具有优于传统油性剂、极压剂的抗磨减摩性能 ,可以大大降低钢 /钢副的摩擦 ,减小磨损。但钢 /钢副中不宜使用含有纳米铁粒子的润滑油。     

The use of X‐ray absorption spectroscopy for monitoring the thickness of antiwear films from ZDDP

X‐ray absorption near edge structure (XANES) spectroscopy at the P K‐edge was used to monitor ZDDP antiwear film thickness with rubbing time. Thermal immersion films of varying thickness were generated from the ZDDP and analysed using XANES spectroscopy and the particle induced X‐ray emission (PIXE) technique. P K‐edge XANES edge jumps and (1s → np) peak heights of the spectra were plotted against PIXE mass thickness values in order to establish calibration curves. Antiwear films were analysed using XANES spectroscopy, and average mass thicknesses were extrapolated from the calibration curves. A set of antiwear films formed in the presence of ZDDP and then further rubbed in base oil (no ZDDP) showed no significant decrease in film thickness. A set of antiwear films rubbed in the presence of ZDDP for various lengths of time showed an increase in film thickness, followed by thinning of the film. The decrease in film thickness is believed to be due to wear caused by the ZDDP solution decomposition products acting as an abrasive in the contact region. This revised version was published online in July 2006 with corrections to the Cover Date.     

有机铋化合物的极压抗磨协同性能研究

利用四球试验机评价了二丁基二硫代氨基甲酸铋(B iDDC)与二丁基二硫代氨基甲酸酯(V7723)、硫化异丁烯(VSB)和非硫磷钼酸酯(MoNO)添加剂的极压和抗磨性能,以及它们之间的极压和抗磨协同作用。试验结果表明:B iDDC添加剂在基础油中具有突出的极压性能,并且与V7723和VSB都表现出了较好的极压协同效果,但是在抗磨性能上,没有产生协同作用。然而B iDDC和MoNO添加剂复合后,不仅表现出了很好的抗磨协同作用,而且没有降低油样的极压性能。     

混凝土输送泵车专用可降解抗磨液压油的研制

介绍了混凝土泵车专用可降解液压油的研制.它采用Ⅱ类基础油/加氢精制茶油和聚α-烯烃（即PAO）复合而成的基础油和不含ZDDP的复合添加剂调和而成,具有可降解性以及良好的抗磨减阻性能,满足混凝土输送泵车各液压系统苛刻的使用要求,延长了换油期.     

Tribological,electrochemical, and spectral analysis of zinc dialkyldithiophosphates (ZDDP) of different thermal stabilities

The antiwear properties of five zinc dialkyldithiophosphates, which differed in thermal stability, were evaluated in a 4-ball machine by a preliminary wear track formation method. After testing the additives, the wear resistance of the films formed was measured by the increase in preliminary wear scar diameter over that of the additive-free oil. IR spectroscopy was then used to study the transformation products of additives after thermostatic testing at between 100 and 240°C on steel surfaces, where the interaction products were evaluated by electrode potential method. The interaction of the decomposition products of dithi-ophosphates with metal surfaces was found to be followed by a change in electrode potential. For the tested additives, a relationship is shown between antiwear effectiveness of the film on a friction track during tribological tests and the electrode potential value of the steel sample. Different parts of the relationship between the electrode potential and temperature relate to different stages of dithiophosphate decomposition measured by IR spectroscopy. It can be said that chemical modification of the steel surface which produces an improvement of antiwear properties, starts at the decomposition temperature of the dithiophosphate neutral salt.     

The influence of base oil properties on the efficiency of action of ZDDP-type additives

This paper deals with the analysis of the influence of base oil viscosity on the ability of ZDDP-containing lubricants to form protective layers (especially antiwear layers). The chemical structure of additives used was characterised according to their thermal stability, determined by differential scanning calorimetry (DSC). The additives were added to base oils of various viscosities. The prepared lubricants were tested using a four-ball machine, and analysed by DSC. The relationships between base oil viscosity and seizure load (P_t), weld load (P_w) and DSC test results are presented and discussed. The mechanism of interaction between ZDDP and the base oils was analysed by the use of a mathematical model.     

Tribochemistry and the development of AW and EP oil additives — a review

The antiwear (AW) and extreme pressure (EP) properties of chlorine, sulphur, phosphorus-containing organic compounds and zinc dialkyldithiophosphate (ZDDP) oil additives are affected greatly by their reactive ability to the metal surface, as well as by the chemical composition, chemical state, physical and mechanical properties of the protective films formed. Over four decades, research has taken place on boundary lubrication, and a much better understanding of the AW and EP action mechanism of one additive by itself in base oil has been obtained, and much more knowledge on the relationship between wear and decomposition of additives, adsorption and reaction of the additive or its decomposed products with metal, has been gained. A series of analytical methods and a great number of modern surface analytical tools have been set up and used for research in this area. The problems and some suggestions for the future study on boundary lubrication of oil additive are proposed.