Wear measurements of self-lubricating bearing materials in small oscillatory movement

Gawarkiewicz, Rafał; Wasilczuk, Michał

doi:10.1016/j.wear.2006.12.060

Cited by 41 publications

(17 citation statements)

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“…Cobalt (Co) is commonly used as a promoter in the cure process of polyester thermosets [42]. 3 ) and respective volume fractions determined by XMT (see Section 3.1.1), concentrations of the latter two compounds can be calculated, providing estimates of 19 wt % (CaCO 3 ). Results from XMT and ICP-SFMS measurements provide almost identical MoS 2 concentrations, while it is almost a two-fold difference in CaCO 3 estimates between the two analytical techniques.…”

Section: Elemental Analysismentioning

confidence: 99%

“…In spite of the severity of the issue and additional maintenance and/or replacement costs involved, only a limited number of studies dealing with wear and friction behavior of commercially available self-lubricating polymer composite bearing materials used for hydropower applications has been reported [2][3][4][5][6]. Jones et al [2] presented an extensive work, studying coefficients of friction and wear rates in both wet and dry conditions and proposed a rating system for several bearing materials.…”

Section: Introductionmentioning

confidence: 99%

“…Jones et al [2] presented an extensive work, studying coefficients of friction and wear rates in both wet and dry conditions and proposed a rating system for several bearing materials. Gawarkiewicz and Wasilczuk [3] evaluated wear rates of four bearing materials under conditions simulating guide vane bearing operation. However, these two studies did not evaluate the influence of sliding speed and pressure.…”

Section: Introductionmentioning

confidence: 99%

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Material Characterization and Influence of Sliding Speed and Pressure on Friction and Wear Behavior of Self-Lubricating Bearing Materials for Hydropower Applications

et al. 2018

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Nowadays, hydropower plants are forced to have more frequent power control and the self-lubricated bearings used in the applications are one of the most critical components affected by the continuously changing operating conditions. In this study, microstructure and composition of two commercially available bearing materials (Orkot TXM Marine and Thordon ThorPlas) used in hydropower turbines were studied. In addition, the influence of sliding speed and applied pressure on the friction and wear behavior of the materials was investigated systematically for dry sliding conditions. The bearing materials were characterized using X-ray microtomography, Nuclear Magnetic Resonance (NMR) spectroscopy and Inductively Coupled Plasma-Sector Field Mass Spectrometry (ICP-SFMS) techniques. Friction and wear tests were carried out with a polymer pin sliding against a stainless steel (SS2333) plate with a linear reciprocating motion. Test conditions were: room temperature, 9-28 MPa pressure and 10-40 mm/s sliding speed ranges. Surface analysis of the polymer pins and the wear tracks were performed by optical profilometry, Scanning Electron Microscope (SEM) and Energy Dispersive Spectroscopy (EDS) techniques. Test results show that, for both materials, the coefficient of friction (COF) is decreasing at higher pressures. Surface analysis reveals higher concentrations of solid lubricants in the transfer layers formed at higher pressures, explaining the decrease in COF. Furthermore, the specific wear rate coefficients are increasing at higher sliding speeds, especially at lower pressures. Results of this study demonstrate that, under dry sliding conditions, changes in sliding speed and pressure have a significant influence on the tribological behavior of these bearing materials.

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Section: Elemental Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Material Characterization and Influence of Sliding Speed and Pressure on Friction and Wear Behavior of Self-Lubricating Bearing Materials for Hydropower Applications

et al. 2018

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“…2 [15]. In some solutions the rolling bearings are installed close to each other and the tested bush is fixed on a pin protruding outside [16] [11][17] w [18] [19].…”

Section: Fig 1 Stand For Testing Propeller Shaft Unit -Shown In Twomentioning

confidence: 99%

Selected Problems of Experimental Testing Marine Stern Tube Bearings

Barszczewska

Piątkowska

Litwin

2019

Polish Maritime Research

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“…Mainly under dry reciprocating sliding, thermal heating and detachment of wear debris containing matrix, fiber and filler fragments followed by accumulation under repetitive shearing and compacting are intensified. 1 Although the oscillatory wear is highly unpredictable, fabric polymer composites have been tested under these conditions only in few cases compared to testing under unidirectional sliding. 2 The sliding of fabric composites in pin-on-disc configurations does not provide a clear picture as the angle of weft and warp fibers continuously change relatively to the sliding direction.…”

Section: Introductionmentioning

confidence: 99%

Reciprocating sliding of polyester textile fabric composites along different fabric orientations

Samyn

2016

Journal of Composite Materials

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The coefficients of friction and wear rates of thermoset polyester matrix composites with plain woven polyester fabric reinforcement were studied during reciprocating sliding under adhesive line contact at 50 to 200 N normal loads and 0.3 to 1.2 m/s sliding velocities. The samples were prepared along different orientations of the fabric relatively to the sliding surface and sliding directions, including 0 , 30 , 45 , 60 and 90 in-plane directions and thickness z direction. The coefficients of friction and wear rates were maximum along 90 and minimum along 45 for pure and polytetrafluoroethylene-filled composites. For the latter, overload conditions were minimized, and friction and wear became low for perpendicular fabric orientations. Although sliding is controlled by solid lubrication of polytetrafluoroethylene, the fiber orientations remain dominating the friction under mild sliding conditions. The differences between friction properties along weft and warp orientations could be correlated with mechanical properties along those directions. However, a systematic study in parallel with interpretation of the thermal heating could provide better insights in dry sliding properties. By considering the effects of thermal heating, thermo-mechanical sliding conditions in the interface controlled self-lubricating properties of polytetrafluoroethylene. The wear mechanisms along 0 and 90 directions were mainly determined by the fabric reinforcement, and the sliding along off-axis 45 and thickness directions was mainly controlled by the matrix and polytetrafluoroethylene deposits.

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Wear measurements of self-lubricating bearing materials in small oscillatory movement

Cited by 41 publications

References 1 publication

Material Characterization and Influence of Sliding Speed and Pressure on Friction and Wear Behavior of Self-Lubricating Bearing Materials for Hydropower Applications

Material Characterization and Influence of Sliding Speed and Pressure on Friction and Wear Behavior of Self-Lubricating Bearing Materials for Hydropower Applications

Selected Problems of Experimental Testing Marine Stern Tube Bearings

Reciprocating sliding of polyester textile fabric composites along different fabric orientations

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