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Investigation of the difference in liquid superlubricity between water- and oil-based lubricants

机译：水基和油基润滑剂之间液体超润滑性差异的研究

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In the present work, we show that the liquid superlubricity (mu < 0.01) of water-based lubricants can be achieved between sapphire/sapphire even when the average contact pressure is higher than 100 MPa, while the superlubricity of oil-based lubricants cannot be achieved with the same contact pressure. However, when the pressure is reduced to 50 MPa, the friction coefficient of oil-based lubricants can translate from non-superlubricity (mu > 0.01) to superlubricity while the friction coefficient of water-based lubricants is always in the superlubricity region. The calculated friction results indicate that the liquid superlubricity is closely linked to pressure and the pressure-viscosity coefficient. When the pressure is high, the pressure-viscosity coefficient has to be as small as possible to achieve superlubricity, but when the pressure is low, superlubricity can be achieved with a wide range of pressure-viscosity coefficients. Finally, the liquid superlubricity region dependent on pressure and the pressure-viscosity coefficient were established, which are useful for us to design liquid superlubricity systems.
机译：在目前的工作中，我们表明即使在平均接触压力高于100 MPa的情况下，蓝宝石/蓝宝石之间也可以实现水基润滑剂的液体超润滑（mu <0.01），而油基润滑剂的超润滑不能达到以相同的接触压力实现。但是，当压力降低到50 MPa时，油基润滑剂的摩擦系数可以从非超润滑性（mu> 0.01）转变为超润滑性，而水基润滑剂的摩擦系数始终处于超润滑区域。计算得出的摩擦结果表明，液体的超润滑性与压力和压力-粘度系数密切相关。当压力高时，为了获得超润滑性，压力-粘度系数必须尽可能小，但是当压力低时，可以在宽范围的压力-粘度系数中实现超润滑性。最后，建立了依赖于压力的液体超润滑区域和压力-粘度系数，这对我们设计液体超润滑系统很有用。

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