二硫化钨润滑添加剂摩擦学性能研究现状

二硫化钨是一种新型的固体润滑添加剂,二硫化钨在润滑脂和润滑油中均表现出了良好的抗磨减摩性能。本文概述了二硫化钨在润滑脂和润滑油中的摩擦学性能研究现状。     

高温高转速低启动阻力全氟醚润滑脂

介绍了几种全氟醚(PFPE)的性能,测试了聚四氟乙烯微粉、二硫化钼填充全氟醚润滑脂的摩擦学性能,采用能谱仪对模拟台架试验后的磨屑进行成分分析。结果表明:随着聚四氟乙烯微粉含量的增加,全氟醚润滑脂的四球磨痕呈上升趋势;添加二硫化钼后,全氟醚润滑脂的摩擦因数降低。普通全氟醚润滑脂用于高速高温轴承时易导致干摩擦,内圈表面碳化;复配的全氟醚复合润滑脂具有耐热性和抗氧化性能优良、黏度适度、蒸汽压-温度特性良好、润滑性能优良、机械安定性好、启动力矩低,满足高温高转速低启动阻力工况条件的要求。     

硫酸钙晶须作为润滑脂添加剂的摩擦学性能

通过四球摩擦磨损实验,考察了不同粒径、不同添加量的硫酸钙晶须在锂基润滑脂中的摩擦学性能,应用光学显微镜观察钢球磨斑表面。结果表明,在一定的摩擦学环境下,添加质量分数3%的球磨6 h的硫酸钙晶须能够显著提高锂基润滑脂的抗磨减摩性能。     

白云母微粉作为润滑脂添加剂的摩擦学性能

将球磨改性的白云母微粉作为添加剂加入锂基润滑脂中,采用四球摩擦磨损试验机考察了白云母锂基润滑脂的摩擦学性能。采用扫描电子显微镜、X射线能谱分析仪、X射线光电子能谱仪对钢球磨损表面进行了分析,并探讨了白云母微粉的摩擦学作用机理。结果表明:白云母微粉能够有效提高锂基润滑脂的摩擦学性能。当添加量为0.5%和1.0%时,分别表现出最好的减摩性能和抗磨性能。白云母微粉优良的摩擦学性能与其层片状结构及磨损表面的物理吸附有关。     

MAF-6作为无水钙基润滑脂添加剂的摩擦学性能研究

以金属多氮唑骨架材料(MAF-6)作为润滑脂固体添加剂,考察其在润滑脂中的摩擦学性能.结果表明,MAF-6作为添加剂能有效提高基础脂的摩擦学性能,在高往复频率、高运行载荷和延长运行时间的条件下,MAF-6脂能够保持优异的减摩抗磨性能.研究其润滑机制发现,在运行过程中,拥有柔性晶体结构的球状MAF-6能够粘附在金属表面,...     

石墨烯润滑脂制备工艺对摩擦性能的影响

以石墨烯和锂基润滑脂为原料,利用WXQM-2A型轻型卧式行星球磨机研究了球料比、球磨转速、球磨时间等制备工艺对润滑脂摩擦性能的影响。采用MMW-1微机控制万能摩擦磨损试验机对其摩擦系数进行了测试。结果表明当制备工艺为球料比5∶1、球磨转速600 r/min、球磨时间1 h时,润滑脂与石墨烯混合均匀,表现出良好的摩擦性能。同时考察了石墨烯含量对其摩擦性能的影响,当石墨烯添加量为0.5%时,石墨烯润滑脂的摩擦系数为0.055、磨斑直径为0.461 mm,较原始润滑脂摩擦系数降低了39%、磨斑直径降低了29.4%。     

混杂短纤维增强聚苯硫醚的老化研究——Ⅱ.滑动摩擦磨损行为

本文研究了在无润滑和水润滑条件下CF/PPS和GF/PPS复合材料老化前后的摩擦学行为,对纤维与树脂之间的协同效应进行了探讨,并提出了线磨损率方面的简易混合公式。结果表明,碳纤维和玻璃纤维增强PPS能显著降低PPS的摩擦系数和磨损率,是一种优良的减磨抗磨材料。热水老化和加速气候老化均无损害PPS复合材料的滑动磨擦性能;在无润滑条件下该体系的摩擦学行为基本符合混合法则,而水润滑条件下却表现出正的混杂效应。     

PVC板料渐进成形润滑方式研究

采用数控渐进成形工艺,利用高速转动工具头与聚氯乙烯(PVC)板料间局部摩擦热以成形变角度圆锥制件,研究了皂液、40号机油、聚四氟乙烯脂、锂基高温润滑脂、水等5种不同润滑剂对PVC板料渐进成形性能的影响,利用多功能摩擦磨损试验机测试了5种不同润滑剂的摩擦系数。结果表明,润滑剂对成形制件最大成形深度和最大成形角度的影响程度由大到小为:皂液40号机油聚四氟乙烯脂水锂基高温润滑脂。水作润滑剂时,随摩擦时间增加,摩擦系数由小增大,基底暴露,起屑严重,制件表面粗糙;皂液、40号机油、聚四氟乙烯脂、锂基高温润滑脂做润滑剂时摩擦系数相差较小,制件表面有轻微刀痕,表面质量相差较小。与其它润滑剂相比,皂液作润滑剂时PVC板料具有较好的渐进成形性能和表面质量。     

碳酸钙在润滑脂中的应用

碳酸钙是一种重要的无机物，具有来源广泛、物美价廉的优点。润滑脂在工业发展中发挥着重要的作用，是机械设备正常运行的重要保障。碳酸钙作为钙类润滑脂的基础原料，可以制备出多种性能良好的润滑脂；作为润滑添加剂，碳酸钙纳米粒子具有良好的摩擦学性能，将其添加到润滑脂中，可以有效提高润滑脂的抗磨减摩性能；碳酸钙具有绿色价廉、填充性能优异的优点，将其作为润滑脂增容增重的填充剂，可以减少润滑脂原料的使用，有利于环境的保护。     

极压抗磨添加剂对高温复合锂基润滑脂性能影响的研究

将3种极压抗磨添加剂（T 304、T 321和T 404）分别加入到4种不同组分的高温复合锂基润滑脂中，考察其对润滑脂性能的影响。研究发现，加入不同的添加剂使润滑脂的油膜强度、锥入度和滴点产生不同的变化，并对其产生的原因作了机理分析。     

Study on the tribological properties of modified polyurethane material for water‐lubricated stern bearing

Polyurethane (PU) has been studied as alternative bearing material for marine water‐lubricated stern tube due to its excellent wear resistance, remarkable mechanical properties and so on. In this study, nine types of PU samples which are composed of different additives were prepared and tested in order to investigate their tribological properties under various working conditions. A pin‐on‐disc tribo‐tester was used to conduct tests. Then comparison analyses were conducted from three aspects, including the friction coefficient, wear mass loss, and the wear surface topography. The analysis results showed that: (1) the different additives as well as the mass fraction of these additives lead to significant difference in terms of tribological properties of PU; (2) the lubricating grease, as one of additives, improved the wear resistance and friction performance effectively; (3) modified PU is eligible to work as matrix because of satisfied mechanical properties and specific internal morphology. It is believed that understandings in this study are beneficial to the improvement of the tribological properties of PU and also provide the real practical basis for the studies of polymer materials which applied on water‐lubricated marine stern tube bearing. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135, 46305.     

Study on the tribological properties of porous sweating PEEK composites under ionic liquid lubricated condition

The tribological behaviors of novel porous Polyetheretherketone (PEEK) composites under 1‐hexyl‐3‐methylimidazolium tetrafluoroborate ionic liquid lubricated condition were investigated. The effect of sliding velocity and applied load on the sweating tribological properties and the stability of lubricating oil film was also studied. Results indicated that when the sliding velocity was 0.69 m/s and the applied load was 250 N, the friction coefficient and wear rate of the ionic liquid lubricated porous sweating activated carbon fiber/polytetrafluoroethene/PEEK composites showed the minimum values, were 0.0197 and 4.145 × 10^?15 m³/Nm, respectively. The friction coefficients fluctuated in a narrow range of 0.0162–0.0215. It was found that the porous sweating PEEK composites under ionic liquid lubricated condition showed good low‐friction and antiwear performance, especially under the condition of high sliding velocity and applied load. The formed transfer film due to the tribo‐chemical reaction as well as boundary lubricating film is effective in improving the carrying capacity and antiwear properties of the porous sweating PEEK composites. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40989.     

润滑脂流变性影响因素研究现状

润滑脂由于其复杂而独特的流变性能,近年来受到了学界的广泛关注。学者们选用一系列流变参数来定性定量描述润滑脂的流变性能。润滑脂组分、工作条件及制备手段的变化常常会影响和改变润滑脂的流变参数。综述了温度,稠化剂结构、含量及粒度,基础油,添加剂及填料,制备条件,微观结构等因素对润滑脂流变参数的影响情况,总结了润滑脂流变学发展中存在的问题,并对润滑脂流变学未来的发展进行了展望。     

Impact of polydimethylsiloxanes on physicochemical and tribological properties of naphthenic mineral oil(KN 4010)-based titanium complex grease

Titanium complex greases were prepared by using naphthenic mineral oil and polydimethylsiloxane as the mixed base oil. The effect of polydimethylsiloxane molecular weight and polydimethylsiloxane content in mixed base oil on the physicochemical and tribological properties of titanium complex greases was investigated.As compared to the sole mineral oil-based titanium complex grease, the use of polydimethylsiloxane(H201-350)as a co-base oil increased the dropping point from 310 to 329 °C, decreased the oil separation from 3.7% to 2.3%,reduced the corrosion extent, and obviously improved the tribological properties. When the mixed oil-based titanium complex grease was used as a lubricant, lubricating films of polydimethylsiloxane were probably formed on the surfaces of friction pairs, giving good lubricating property.     

Tribological properties and corrosion resistance of epoxy resin-polytetrafluoroethylene bonded solid lubricating coating filled with flake aluminum

The aims of this work are to prepare a novel epoxy resin-polytetrafluoroethylene (expressed as EP/PTFE) bonded solid lubricating coating filled with flake aluminum. The focus is to study the effects of two different flake aluminum (floating type and non-floating type) on the tribological performance and anti-corrosion capability of the coating. A CSM friction tester was applied to evaluate the tribological performance of the coating. The electrochemical technique was applied to study the corrosion resistance of the coating. And the experimental results showed that both types of flake aluminum can ameliorate the tribological performance and anti-corrosion properties of the EP/PTFE lubricating coating. Moreover, compared with floating flake aluminum, the incorporation of non-floating flake aluminum significantly improved the tribological properties and corrosion resistance of the EP/PTFE coating due to its good dispersibility, greater enhancement effect on mechanical performance and stronger barrier properties.     

锂基润滑脂热流变特性及其变化机理

采用旋转流变仪探究了变温条件下的锂基润滑脂流动特性和黏弹特性,考察了温度对锂基润滑脂流变特性变化的影响规律,并对热流变过程中壁面滑移效应变化规律进行了讨论。进一步结合锂基润滑脂的微观形貌,探究了锂基润滑脂皂纤维结构与热流变特性变化的关联性。最后基于热流变和皂纤维结构研究结果,分析了锂基润滑脂胶体分散体系结构演化过程,给出了胶体分散体系及壁面滑移效应在热流变条件下的变化机理。     

纳米坡缕石不同添加量对润滑脂性能的影响

将不同质量分数的纳米坡缕石添加至已被石油醚稀释过的润滑脂中,再用球磨机使其分散均匀,烘干至石油醚挥发完全,制备出五种纳米坡缕石润滑脂,对试样进行四球摩擦试验,以便探究纳米坡缕石添加量对润滑脂性能的影响,并通过SEM检测结果分析摩擦磨损机制。结果表明,纳米坡缕石能够提高润滑脂承载能力;当其添加量为1%时,润滑脂的最大无卡咬负荷PB最大,较未添加纳米坡缕石的提高率为76.5%;当添加量为2%时,润滑脂烧结负荷PD和综合磨损值ZMZ最大,提高率分别为30%和93.1%。     

Synthesis of amorphous carbon films by plasma-based ion implantation with simultaneous application of DC and pulse bias

Carbon films were synthesized on a Si wafer by simultaneous application of pulse bias and DC bias by a plasma-based ion implantation system using an electron cyclotron resonance (ECR) plasma source with a mirror field. The relationship between the pulse biasing voltage and the properties of carbon films was investigated. The hardness and tribological properties of the carbon film improved as the pulse bias voltage was decreased from −10 kV to −2 kV. Diamond-like carbon (DLC) films with a low friction coefficient were formed by simultaneous application of a low pulse bias voltage, such as −2 kV, and a DC bias. During the friction test of the DLC film, excellent tribological properties were observed under a high conducted load, such as 20 N, which shows that not only the friction coefficient but also the durability during the friction test was improved. The improvement of the tribological property was attributed to the formation of a mixed layer at the interface between the DLC film and the Si substrate.     

正十二烷硫基硼酸钡摩擦学性能研究

合成了一种油溶性化合物正十二烷硫基硼酸钡(Ba-SB),并将其作为润滑油添加剂,采用四球摩擦磨损试验机评价了其摩擦学性能。结果表明:该添加剂具有较好的油溶性能和热稳定性能。十二烷硫基硼酸钡使HVI500基础油的抗磨性能明显改善,承载能力得到明显提高,摩擦系数明显降低,采用扫描电镜对钢球磨斑表面形貌进行分析,加了该添加剂的钢球磨斑表面平整、光滑,犁沟浅且钢球磨斑表面有沉积物,从EDS谱图上可以看出摩擦副表面含有B、N、Cr、Fe、S元素。从XPS分析添加剂在摩擦过程中发生了摩擦化学降解反应,并在摩擦副表面生成了BaO,B2O3和FeB的个物质抗磨减摩膜,从而改善了其摩擦磨损性能。     

Tribological properties of Si3N4–graphene nanocomposites

Mechanical and tribological properties of nanocomposites with silicon nitride matrix with addition of 1 and 3 wt% of various types of graphene platelets were studied. The wear behavior was observed by means of the ball-on-disk technique with a silicon nitride ball used as the tribological counterpart at room temperature in dry sliding. Coefficient of friction and specific wear rates were calculated and related to the damage mechanisms observed in the wear tracks. The measured properties were then assessed with respect to the type and volume fraction of the graphene additives. It is shown that addition of such amounts of carbon phases does not lower the coefficient of friction. Graphene platelets seem to be integrated into the matrix very strongly and they do not participate in lubricating processes. The best performance offers materials with 3 wt% of larger sized graphene, which have the highest wear resistance.