Insight into water lubrication performance of polyetheretherketone

Abstract

Polyetheretherketone (PEEK) is a kind of polymer with excellent mechanical properties combined with good wear resistance and has been widely used in the engineering field. In order to explore the possibility for PEEK using as a water-lubricated bearing material, an in-depth study on the water lubrication performance of PEEK was conducted by using a series of experiments. The water lubrication performances combined with the lubricating mechanism were evaluated both by the friction coefficient and by the wear behavior of PEEK. The results indicated that PEEK was suitable for water-lubricated bearing productions. The water film could form effectively between the friction pairs under high sliding velocity, while the transfer film could form under low sliding velocity. Both the water film and the transfer film could improve the water lubrication performance for the friction pairs. Moreover, sliding velocities and contact pressures highly influence the water lubrication performance of PEEK. The increase in contact pressure or the decrease in sliding velocity would exacerbate the wear of material. The stick-slip phenomena also occurred on the specimens under low sliding velocity. The main purpose of this study is to provide an experimental basis for PEEK using as a waterlubricated bearing material.

Influence of rotation speed on abrasive wear behavior of the UHMWPE in lubrication environment

“…Moreover, the lubricating fluid would accelerate into the friction interface and improve the lubrication leading to a decrease in the coefficient of friction when the rotation speed increases. 37 For the lubrication environment including abrasive particles, the movement of particles within the interface became more violent as the rotation speed increased. These enhanced the disruption of the integrity of the lubricating water film in the interface by the particles, resulting in direct contact between the two solid surfaces in some places, and the friction pair is in the wear state of wet wear particles, thus increasing the friction coefficient.…”

Effect of Wear-Induced Surface Deformation on Stick–Slip Friction of Galvanized Automotive Steels

“…Stick–slip friction, a typical nonsmooth vibration, is a friction-induced phenomenon widely observed under low-speed conditions. In general, stick–slip friction causes serious problems, including surface damage, noise, reduced equipment precision, and energy loss. − Research on stick–slip friction has been explored throughout a broad area from automobiles, ,− high-speed trains, , marine equipment, − and drilling systems. − In recent years, noise, vibration, and harshness (NVH) problems caused by stick–slip friction between the interior materials of automobiles have raised concerns from automotive original equipment manufacturers because these issues lead to uncomfortable and unhealthy experiences for customers. ,− The NVH problem gets more serious, especially when driving on uneven roads. With this regard, considerable efforts have been made to suppress the stick–slip friction between the interior materials of automobiles. , …”

Experimental study on the influence of friction pair material hardness on the tribological behaviors of water lubricated thrust bearings

“…Statistics show that the average specific pressure of WLBs is roughly 0.246 MPa and the service life is around 9,000 h, both of which are far less than that of oil lubricated bearings of the same size. Although there are many studies on the friction performance of water lubricated materials (Qiu et al , 2019; Huang et al , 2021; Wu et al , 2021) and the lubrication model and structure optimization design of WLBs (Liang et al , 2019a, 2019b), the problems of low LCC and poor wear resistance have not been solved. The key to improving the LCC and wear resistance of WLBs may be to develop or select water lubricated materials with high wear resistance.…”

“…Based on the above goals, two polymeric materials, PEEK and Polyurethane, were used to make polymer bearings and three hard materials, aluminum bronze ZQAl10-3, stainless steel 3Cr 17 NiMo, Si 3 N 4 , were used to make thrust collars. These materials were commonly used to make water lubricated friction pairs (Han et al , 2020; Tang et al , 2010; Wang et al , 2011; Huang et al , 2021; Wu et al , 2021). They were paired to make six kinds of full-scale WTBs.…”