Tribological behaviour and transfer layer development of self-lubricating polymer composite bearing materials under long duration dry sliding against stainless steel

Rodiouchkina, Maria; Lind, Jonna; Pelcastre, Leonardo; Berglund, Kim; Rudolphi, Åsa Kassman; Hardell, Jens

doi:10.1016/j.wear.2021.204027

Cited by 34 publications

(26 citation statements)

References 22 publications

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“…The average specific wear rates for the thermoset material sliding against stainless steel at different nominal contact pressures between 26 and 80 MPa are presented in Figure 13b. In contrast to the coefficient of friction, the wear rate of the thermoset is not The obtained mean and maximum coefficients of friction for the thermoset at the lowest contact pressure of 26 MPa, with averages of 0.067 ± 0.005 and 0.075 ± 0.005 respectively, are lower than the ones reported in previous studies at similar operating conditions [8,15,18,19]. This is attributed to the size of the thermoset pins used in this study, which has a 20 times larger nominal contact area in comparison to previous studies [8,15,18,19].…”

Section: Effect Of Contact Pressure On Friction and Wearcontrasting

confidence: 72%

“…For the study regarding the influence of contact pressure, For the tribological tests, pin specimens with dimensions of 18 × 18 × 10 mm 3 (l × w × h) were used, machined from the two bearing materials. This gives a 20 times larger nominal contact area in comparison to previous studies by the authors [8,15] where pins with dimensions of 4 × 4 × 4 mm 3 (l × w × h) were used, illustrated in Figure 7a. In order to minimize the edge effect and to remove fibers that protrude from the surface and machining marks, the edges of the load-carrying side of the polymer pins were manually ground using SiC abrasive paper of grit size #600.…”

Section: Materials and Specimen Preparationmentioning

confidence: 72%

“…Instead, the rate of friction decrease slows down and stabilizes somewhere between 26 and 53 MPa. [8,15,18,19]. This gives a better representation of the thermoset material as seen in Figure 7a due to a proportionally higher content of solid lubricants.…”

Section: Effect Of Contact Pressure On Friction and Wearmentioning

confidence: 96%

“…The bearings (radial and axial) in hydropower applications operate at high nominal contact pressures up to 80 MPa (such as the lever/link bearings). In previous studies on the thermoset bearing material, nominal contact pressures between 20 and 28 MPa have been selected for flat-on-flat configurations using small pins with dimensions of 4 × 4 × 4 mm 3 [8,15,18,19] and nominal contact pressures of 20-30 MPa have been selected for journal bearing configurations [4,20,21]. For the flat-on-flat configurations, the maximum load is limiting the nominal contact pressures and the polymer pins are usually quite small to obtain higher contact pressures.…”

Section: Effect Of Contact Pressure On Friction and Wearmentioning

confidence: 99%

“…There are many tribological test equipment, or tribometers, available on the market today, and many of these offer the possibility to perform friction and wear tests using a flat-on-flat contact configuration and reciprocating motion [6][7][8][9][10]. The main limitation with these test rigs is the upper limit of contact pressure that can be reached when using an area contact.…”

Section: Introductionmentioning

confidence: 99%

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A Novel Reciprocating Tribometer for Friction and Wear Measurements with High Contact Pressure and Large Area Contact Configurations

et al. 2021

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There are many moving machine assemblies with conformal tribological contacts at very high contact pressures, e.g., sliding bearings, propeller shaft bearings and machine guideways. Furthermore, applications such as trunnion and guide vane bearing in Kaplan turbines have very low sliding speeds and oscillatory types of motion. Although there is a vast selection of tribology test rigs available, there is still a lack of test equipment to perform friction and wear tests under high contact pressure, reciprocatory sliding and large area contact. The aim of this work is thus to develop a novel reciprocating tribometer and test method that enables friction and wear tests under low-speed reciprocatory sliding with contact pressures up to 90 MPa in a flat-on-flat contact configuration. First, a thorough description of the test rig design is given. Secondly, the influence of contact pressure and stroke length on the tribological properties of a stainless steel and polymer composite material combination is studied. The significance of considering creep, friction during the stroke and contact temperature is specifically highlighted. The novel tribometer can be used to screen different bearing and shaft material combinations and to evaluate the friction and wear performance of self-lubricating bearings for the specific operating conditions found in Kaplan turbines.

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Section: Effect Of Contact Pressure On Friction and Wearcontrasting

confidence: 72%

Section: Materials and Specimen Preparationmentioning

confidence: 72%

Section: Effect Of Contact Pressure On Friction and Wearmentioning

confidence: 96%

Section: Effect Of Contact Pressure On Friction and Wearmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Novel Reciprocating Tribometer for Friction and Wear Measurements with High Contact Pressure and Large Area Contact Configurations

et al. 2021

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Comparative Wear and Friction Analysis of Sliding Surface Materials for Hydrostatic Bearing under Oil Supply Failure Conditions

Michalec,

Daněk,

Foltýn

et al. 2024

Adv Eng Mater

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Hydrostatic bearings are commonly used in high‐precision applications due to their excellent performance across a wide range of sizes, from millimeters to tens of meters. However, their operation is dependent on a continuous external supply. If this supply fails or the pad alignment is improper, collisions or damage to sliding surfaces can occur, compromising machine precision or even causing malfunction. This study presents an experimental assessment of selected material combinations for sliding surfaces to minimize damage in large‐scale hydrostatic bearings under critical conditions. The research aims to identify the most suitable material combinations that ensure a reliable and efficient operation of hydrostatic bearings, even in the case of oil supply failure or pad misalignment. The experimental methodology focuses on the influence of material properties on friction and wear. According to the results, the most suitable materials to combine with structural steel are tin, polytetrafluoroethylene, and leaded compositions. On the other hand, aluminum bronze, structural steel, and galvanized steel are the least suitable combinations. These findings offer valuable insights into selecting the most appropriate conformal sliding surface material combination for large‐scale hydrostatic bearings based on multiple criteria, which can contribute to improved safety and durability.

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Role of reinforcement on the tribological properties of polytetrafluoroethylene composites: A comprehensive review

Deshwal,

Belgamwar,

Bekinal

et al. 2024

Polymer Composites

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Polytetrafluoroethylene (PTFE) is widely used in tribological applications. However, it faces challenges due to its high wear rate. Reinforcement of additives in PTFE reduces its wear rate by up to 10,000 times in dry conditions. Infusing metallic filler materials like Al, Cu, and Pb improves PTFE wear performance but increases the coefficient of friction (COF). However, it may not be suitable for corrosive environments due to potential metal reactivity. Reinforcing PTFE composites with carbon‐based materials reduces weight, improves wear properties, and lowers COF. Pre‐treated materials enhance bonding for improved anti‐friction and anti‐wear properties. PTFE and its composites are widely used in journal bearings, bearing pads, and ball bearings due to their excellent low‐speed, low‐load lubrication properties. They outperform Babbitt alloy in bearing pads, except in heat conductivity. PTFE can also be used as a solid lubricant and can be combined with additives for improved performance. Apart from it, achieving an optimal combination of properties for all forms of reinforcement can be challenging due to the difficulty in determining exact values for multiple properties with specific types of reinforcement. This article provides a comprehensive review that delves into the significant findings pertaining to reinforcement and its application in bearing technology.Highlights Metals and carbon‐based fillers improve tribo‐properties. Polytetrafluoroethylene (PTFE) provides lubrication and thermal stability to the polymeric materials. Estimation of tribo‐thermal properties in combination is a challenge. Testing conditions greatly impact PTFE composites performance. PTFE as a solid lubricant suitable for low‐speed/load applications.

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Tribological behaviour and transfer layer development of self-lubricating polymer composite bearing materials under long duration dry sliding against stainless steel

Cited by 34 publications

References 22 publications

A Novel Reciprocating Tribometer for Friction and Wear Measurements with High Contact Pressure and Large Area Contact Configurations

A Novel Reciprocating Tribometer for Friction and Wear Measurements with High Contact Pressure and Large Area Contact Configurations

Comparative Wear and Friction Analysis of Sliding Surface Materials for Hydrostatic Bearing under Oil Supply Failure Conditions

Role of reinforcement on the tribological properties of polytetrafluoroethylene composites: A comprehensive review

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