As a high-performance engineering polymer, poly(ether ether ketone) (PEEK) is a perfect candidate material for applications under extreme working conditions. However, its high wear rate greatly shortens its service life. In this study, ultralow friction and wear between PEEK and silicon nitride (Si3N4) under extreme-load conditions (with a mean contact pressure above 100 MPa) are found in acid lubricating solutions. Both friction and wear decrease sharply with decreasing pH. At pH = 1, the friction coefficient decreases by an order of magnitude and the wear rate of the PEEK decreases by two orders of magnitude compared to the results with water lubrication. These reductions in friction and wear occur for different speed, load, and surface roughness conditions. The underlying mechanism can be attributed to the formation of hydrogen-ion-induced electrical double layers on the surfaces of PEEK and Si3N4. The combined effect of the resulting repulsive force, electro-viscosity, and low shear strength of the wa...

中文翻译：

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极端载荷下氢离子诱导的 PEEK 超低磨损

作为一种高性能工程聚合物，聚醚醚酮 (PEEK) 是极端工作条件下应用的理想候选材料。但其高磨损率大大缩短了其使用寿命。在这项研究中，在酸性润滑溶液中发现了在极端负载条件下（平均接触压力高于 100 MPa）PEEK 和氮化硅 (Si3N4) 之间的超低摩擦和磨损。摩擦和磨损都随着 pH 值的降低而急剧下降。在 pH = 1 时，与水润滑的结果相比，摩擦系数降低了一个数量级，PEEK 的磨损率降低了两个数量级。这些摩擦和磨损的减少发生在不同的速度、负载和表面粗糙度条件下。潜在机制可归因于在 PEEK 和 Si3N4 表面形成氢离子诱导的双电层。所产生的排斥力、电粘度和水的低剪切强度的综合影响...