共查询到20条相似文献,搜索用时 31 毫秒
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研究了钢-钢摩擦副在干摩擦、水润滑、酒精润滑和60 N油润滑等条件下的摩擦磨损行为。结果表明:润滑介质可以显著降低钢-钢摩擦副的摩擦系数,在干摩擦、水润滑、酒精润滑和60N油润滑,摩擦载荷为(50~200)g(钢球半径为2 mm)时摩擦系数的平均值分别为0.75~0.81,0.45~0.33,0.22~0.15,0.13~0.09;在高载荷下酒精润滑与油润滑磨损速率相差甚小,并且在摩擦磨损初期阶段(500 s之内)摩擦系数相差甚少;同时,酒精润滑条件下的磨损表面形貌与油润滑下的磨损表面形貌极为相似,无明显粘着现象。分析表明,酒精润滑是一种绿色润滑介质,在压延、拉伸工业中有良好的应用前景。 相似文献
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水作为液压介质必须解决润滑性能差、渗透泄漏性强、腐蚀与气蚀等三大关键技术问题。本文探讨了水液压元件的润滑与密封、腐蚀与气蚀及摩擦与磨损机理.并提出相应的解决措施。 相似文献
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本文是重新估计润滑状态的一种新的探讨——利用铁谱技术对摩擦界面间存在的磨柱进行观察分析。论证了磨粒对润滑状态的影响及其统计的尺寸分布规律。进而提出润滑状态可靠性的计算方法。 相似文献
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与一般大型机械设备中的摩擦副不同,小尺度摩擦副润滑油膜在表面张力的作用下不再是水平形状,从而影响到摩擦副的摩擦学特性。在考虑到表面张力作用的基础上,对小尺度摩擦副进行摩擦学理论分析,建立了二维模型并求解了雷诺方程,以研究小尺度下表面张力对摩擦副摩擦学特性的影响。研究结果显示,由于表面张力的影响,摩擦副的油膜压力分布和承载能力有较大幅度的变化。宏观状态下的摩擦学设计与小尺度摩擦副的实际情况相去甚远,对小尺度摩擦副表面张力作用下的摩擦学特性进行研究是十分必要的。 相似文献
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八纵向沟水润滑橡胶轴承润滑性能研究 总被引:6,自引:2,他引:6
水润滑橡胶轴承是水下最适宜的轴承之一,笔对潜水泵上常用的八纵向沟水润滑橡胶轴承,在水润滑条件下的润滑机理进行了实验研究,根据实验结果剖析了影响摩擦系数的主要因素及其影响规律,并据此提出了一组实用设计参数。 相似文献
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E. Van Der Heide C. M. Lossie K. J. C. Van Bommel S. A. F. Reinders H. B. M. Lenting 《摩擦学汇刊》2013,56(6):842-847
A study on the effect of a brush coating of polyacrylic acid (PAA) grafted with poly(ethylene glycol) (PEG) (PAA-g-PEG) on friction was done for a sliding system that involves silicone skin L7350: a silicone rubber used by the Fédération Internationale de Football Association (FIFA) for the determination of skin–surface friction in combination with artificial grass. Friction experiments were carried out using a reciprocating flat-on-flat test setup with the selected brush coating and compared with PAA-coated and fluoroalkane-coated samples. The experiments were focused on the effect of water. Results for the coatings tested at dry conditions showed a coefficient of friction above 1. Effective lubrication by water was able to reduce friction to a coefficient of friction below 0.01 at low sliding velocities. The results are currently used to further develop low-friction products for sliding interactions with human skin; for example, artificial grass and possibly medical textiles. 相似文献
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在干摩擦、水润滑、锂基脂润滑和锂基脂+MoS2润滑不同条件下,利用MPX-2000型盘销式摩擦磨损试验机,对HIP-Si3N4/GCr15摩擦副进行了摩擦磨损性能的对比试验研究,通过扫描电子显微镜对试件的表面形貌进行观察分析。结果表明:磨损速率的表现,Si3N4为水润滑>干摩擦>锂基脂润滑>锂基脂+MoS2润滑;GCr15为干摩擦>水润滑>锂基脂润滑>锂基脂+MoS2润滑。在锂基脂+MoS2润滑条件下,HIP-Si3N4/GCr15摩擦副摩擦特性最佳。 相似文献
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本文分析了阻抗式比例润滑系统产生问题的原因和顺序式定量润滑系统的工作原理,介绍了不同种类摩擦副耗油量的确定原则,并对摩擦副温升的试验数据进行了分析对比。 相似文献
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A simple dynamic friction model for an elastohydrodynamic lubrication sliding and rolling line contact has been developed. This model uses the technique introduced earlier by Harnoy and Friedland (1). The model includes low-velocity regions where friction is a combination of contact and elastohydrodynamic friction. The study shows that the lime-variable friction is not only a function of instantaneous sliding velocity, but is also a memory function of the velocity history. Simulation of the model for an oscillating velocity exhibits similar hysteresis effects in friction-velocity curves as observed earlier in several experimental studies. The model can be useful for friction compensation to enhance the precision of motion in control systems. 相似文献
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Ali Erdemir 《摩擦学汇刊》2013,56(3):471-478
The interatomic array and bond structure in crystalline states of the monochalcogenides tin selenide and gallium selenide are described and correlated with their solid lubricating capacity. Friction tests assessing their solid lubricating performance were carried out on a pin-on-disk machine. Specifically, large crystalline pieces of each inorganic solid were cut and cleaved into flat squares and subsequently rubbed against sapphire balls. In another case, fine powders of gallium selenide and tin selenide luere manually fed into the sliding interfaces of 440C pins and 440C disks. For the specific test conditions explored, friction coefficients of the sapphire/ gallium selenide and sapphire/tin selenide pairs were approximately 0.23 and approximately 0.35, respectively. The friction coefficients of 440C pin/440C disk test pairs with gallium selenide and tin selenide powders were approximately 0.22 and approximately 0.38, respectively. For comparison, a number of parallel friction tests were also performed with MoS2 powders and compacts, and the results of these tests are reported. The friction data, together with the crystal-chemical knowledge and electron microscopy evidence, supported the conclusion that the solid lubricating capabilities and lubrication mechanisms of these solids are closely related to their crystal chemistry and the nature of their interlayer bonding. 相似文献
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A series of experiments was conducted for validating a newly developed theory of scuffing. The Critical Temperature-Pressure (CTP) theory is based on the physisorption behavior of lubricants and is capable of predicting the onset of scuffing failures over a wide range of operating conditions, including the contacts operating in the boundary lubrication and in the partial elastohydrodynamic lubrication (EHL) regimes. According to the CTP theory, failures occur when the contact temperature exceeds a certain critical value which is a function of the lubricant pressure generated by the hydrodynamic action of the EHL contact. A special device capable of simulating the ambient conditions of the partial EHL conjunctions (of contact temperature, pressure, and the lubricant pressure) was constructed. A ball-on-flat type wear tester was put inside a pressure vessel, completely immersed in a highly pressurized bath of mineral oil. The temperature on the flat specimen was gradually increased while the ball was slowly traversed. At a certain critical temperature, the friction force abruptly jumped indicating the incipiency of the lubrication breakdown. This experiment was repeated for several levels of hydrostatic pressure and the corresponding critical temperatures were obtained. The test results showed an excellent correlation with the newly developed CTP theory. 相似文献