EHD和混合润滑状态下的超低牵引力
Super Low Traction under EHD and Mixed Lubrication Regimes
摘要：
在Martin等人对MoS 2 [1]、Hirano等人对钨和硅[2]以及Dienwiebel等人对石墨[3]的进一步确认进行了开创性的超润滑实验工作之后，世界各地的许多小组研究了近无摩擦滑动接触的发生。摩擦学家、材料科学专家和物理学家的大规模动员导致了涉及新材料和涂层的新兴解决方案，最有前途的是碳基材料，如石墨、金刚石、碳复合材料或类金刚石碳。其中一些目前已在实际应用中使用。情况有所不同，特别是在EHL中：当涉及牵引流体时，最高摩擦系数接近10%，即特别设计用于传递最高摩擦的流体，其余润滑剂的摩擦系数在3-6%内变化。因此，变化范围非常窄，并且这些典型值与在干接触中获得的值相比确实很低：因此，从润滑中的超低牵引状态预期的增益可能会更有限，特别是在中尺度或宏观尺度下进行的实验的情况下。这种薄弱的观点可能是最近文献中涉及上述条件下润滑超润滑性的文章数量相对较少的一种解释。
英文摘要：
After the pioneered experimental works on superlubricity by Martin et al. on MoS2 [1], Hirano et al. on tungsten and silicon [2] and the further confirmation by Dienwiebel et al. on graphite [3], many groups around the word investigated the occurrence of near frictionless sliding contacts. This large mobilization of tribologists, material sciences specialists and physicists has lead to emerging solutions involving new materials and coatings, the most promising being carbon based like graphite, diamond, carbon composites or diamond-like-carbons. Some of them are currently used in practical applications. The situation is different especially in EHL: the highest friction coefficients are close to 10% when traction fluids are involved, i.e. fluids that have especially designed to transmit the highest friction, and they vary within 3-6% for the rest of lubricants. The range of variation is consequently very narrow and these typical values are really low compared to those obtained in dry contacts: as a consequence the gain expected from a super low traction regime in lubrication will be probably more limited, especially in the case of experiments conducted at the meso or macro scales. This weak perspective could be one explanation on the relatively low number of articles in recent literature dealing with lubricated superlubricity in the above conditions.
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