Abstract
Abstract In this study, the tribological properties of hybrid polytetrafluoroethylene (PTFE)/Nomex fabric/phenolic resin composites were investigated under three operating conditions: dry sliding, dry sliding after soaking in water for 12 h, and water dripping lubrication. The friction coefficient (COF) was measured with a pin-on-disk tribometer. The wear surface was analyzed with a scanning electron microscope. The results show that water weakens the tribological properties of single-layer hybrid PTFE/Nomex fabric/phenolic resin composites. The fabric composites show slight abrasive wear with stable COF under dry sliding conditions, significant abrasive wear with oscillating COF after soaking, and destruction with severely oscillating COF under water dripping lubrication. Generally, water weakens the effect in two ways. The first is weakening the binding force between phenolic resin and Nomex fiber. The second is that Nomex fiber absorbs water and expands, which reduces its strength. Finally, the ideas to improve the tribological properties under water dripping lubrication are presented.
Highlights
The water-lubricated stern bearing is an important component of the marine power system
Zhang et al used air plasma treatment and cryogenic treatment to improve the tribological properties of the hybrid PTFE/Kevlar fabric/phenolic composite
Ren et al [19] investigated the tribological properties of the hybrid PTFE/Nomex fabric/ phenolic composite under dry and water-bathed sliding conditions, and the results showed that the composite had a higher wear rate and a lower friction coefficient (COF) under water-bathed sliding conditions
Summary
The water-lubricated stern bearing is an important component of the marine power system. PTFE\Nomex hybrid fabric\phenolic composite is a material that can be used in stern tube bearing. Some studies have examined the tribological properties of PTFE\Nomex hybrid fabric\phenolic reinforced composite under dry sliding conditions [1,2,3,4,5,6,7]. Yang et al added fillers and different treatments to improve the tribological properties of the PTFE\Nomex hybrid fabric\phenolic reinforced composite under dry friction conditions [8,9,10,11,12,13,14]. Zhang studied the filler of TiO2, CuS, and ZnO on the tribological properties of the hybrid PTFE/Kevlar fabric/phenolic composite [15,16,17,18]. The material failure mode under water dripping conditions was analyzed by checking the scanning electron microscope (SEM) images
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