Tribological Behavior of PTFE Composites Filled with PEEK and Nano-Al<sub>2</sub>O<sub>3</sub>

Qi, Yuan; Gong, Jinwu; Cao, Wei; Wang, Honggang; Ren, Jin; Gao, Guanzhen

doi:10.1080/10402004.2017.1395099

Cited by 24 publications

(7 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Compared with metals, polymers possess certain desired properties for engineering use, i.e., lightweight (low density), low cost, ease of manufacturing, self-lubricating and corrosion resistance [1][2][3][4]. They can provide significant weight savings while maintaining structural performance, and therefore offering improved fuel efficiency for aerospace and other transport applications.…”

Section: Introductionmentioning

confidence: 99%

PEEK Composites as Self-Lubricating Bush Materials for Articulating Revolute Pin Joints

2020

View full text Add to dashboard Cite

In this study, bearing bushes made of polyetheretherketone (PEEK), 30 wt % carbon fibre reinforced PEEK, 30 wt % glass fibre reinforced PEEK, each 10 wt % of PTFE, graphite and carbon fibre modified PEEK were investigated on a purpose built pin joint test rig. The unlubricated friction and wear behaviour was assessed in sliding contact with a 300M shaft, subjected to a nominal pressure of 93 MPa, articulating sliding speed of 45 °/s. The worn surface and the subsurface layer were studied using optical profilometry and scanning electron microscopy (SEM). Due to thermal sensitivity of PEEK composites, friction energy and temperature rise were analysed for determining the friction and wear mechanism. The bush made of PTFE, graphite and carbon fibre (each 10 wt %) modified PEEK presented the best performance for friction coefficient, wear loss, friction energy and temperature rise. Current work demonstrated that reinforcement modified PEEK composite possesses desirable properties to perform as a load bearing bush in certain tribological applications.

show abstract

Section: Introductionmentioning

confidence: 99%

PEEK Composites as Self-Lubricating Bush Materials for Articulating Revolute Pin Joints

2020

View full text Add to dashboard Cite

show abstract

“…The abrasion resistance of PTFE composites has seen substantial advancement due to decades' worth of research and development efforts [3][4][5][6][7][8][9][10][11]. In recent years, nanofillers have received more attention from researchers due to the large specific surface area and small size effect of nanoparticles compared to conventional fillers [12][13][14][15]. Burris et al [12] investigated the use of PTFE composites containing 5% α-Al 2 O 3 nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Tribological Properties of Nano-ZrO2 and PEEK Reinforced PTFE Composites Based on Molecular Dynamics

Sun

Zhang

et al. 2023

Lubricants

View full text Add to dashboard Cite

Polytetrafluoroethylene (PTFE) is a polymeric material with excellent self-lubricating properties. In this study, in order to improve the wear resistance of PTFE, the PTFE matrix was filled with soft-phase polyetheretherketone (PEEK) particles and hard-phase nano-ZrO2 particles in varying volume ratios. A linear reciprocating friction tester was used to test the tribological properties of the PTFE composites. Optical microscopy (OM) and scanning electron microscopy (SEM) were utilized to observe the formation and evolution of the transfer film on the surface of the counterpart metal during the friction process. Molecular dynamics simulation software (Materials Studio MS) was used to simulate and analyze the frictional behavior between the molecular structures of PTFE composites and the counterpart iron atoms on a microscopic scale. The results showed that the uniformity and firmness of the transfer film had an important influence on the wear resistance of the material. PEEK and ZrO2 nanoparticles were able to improve the firmness and formation rate of the transfer film, respectively, resulting in significant improvement in the wear resistance of PTFE (volume wear rate reduced from 7.7 × 10−4 mm3/Nm for pure PTFE to 1.76 × 10−6 mm3/Nm for nano-ZrO2/PEEK/PTFE). Molecular dynamics simulations revealed that the poor wear resistance of PTFE was due to significant interlayer slippage within its molecular chains. PEEK molecular chains could effectively adsorb PTFE molecular chains and formed a strong bond. ZrO2 nanoparticles also contributed to the overall stability of the PTFE matrix. Both soft and hard fillers significantly inhibited interlayer slippage between PTFE molecular chains, enhancing the shear deformation resistance of the material and thus improving the wear resistance of PTFE composites.

show abstract

“…In addition to cumulative travel distances, the wear rate (i.e., wear thickness per sliding distance unit) is the other key factor contributing to the wear condition of sliding surfaces. Many studies have been undertaken to investigate the tribological behaviours (i.e., friction and wear) of sliding materials (e.g., PTFE and its composites) [14][15][16]. Various factors, including contact pressure, temperature, lubrication, sliding surface material, sliding speed, and mating surface, infuence the wear rate of sliding materials [17].…”

Section: Introductionmentioning

confidence: 99%

Cost-Effective Maintenance Policy for Sliding Surfaces of Bridge Bearings Using a Gamma Stochastic Process for Forecasting

Forde

Caballero³

et al. 2023

Structural Control and Health Monitoring

View full text Add to dashboard Cite

To determine the optimal alert threshold for sliding surface replacement of bridge bearings, a cost-effective maintenance policy is proposed in this paper using a gamma stochastic process. First, the sliding surface-triggered run-to-failure process of bridge bearings is discussed based on existing field inspection and maintenance records. Then, the wear thickness of sliding materials is estimated step-by-step based on the cumulative travel distance and wear rate. The gamma stochastic process is used to model degradation of sliding surfaces by using the indicator of wear thickness to depict uncertainties during the degrading process. Next, the optimal alert threshold for replacement of sliding surfaces is determined based on the cost-effective maintenance policy by minimizing the long-term expected maintenance cost rate. Finally, bearings of a long-span suspension bridge are employed to demonstrate the potential effectiveness of the proposed methodology. As a result, the wear thickness of sliding materials approximately follows a linear degrading law. Based on the gamma degrading model, the objective function subject to the long-term expected cost rate is formed. After optimization, the optimal alert threshold for replacement of sliding surfaces is 2.016 mm to achieve a minimum long-term expected maintenance cost rate of US$9,427 per day. In addition, the estimated service life subject to the alert threshold obeys a Gaussian distribution with a mean of 1278 days based on the one-year monitored displacement data.

show abstract

Tribological Behavior of PTFE Composites Filled with PEEK and Nano-Al₂O₃

Cited by 24 publications

References 38 publications

PEEK Composites as Self-Lubricating Bush Materials for Articulating Revolute Pin Joints

PEEK Composites as Self-Lubricating Bush Materials for Articulating Revolute Pin Joints

Tribological Properties of Nano-ZrO2 and PEEK Reinforced PTFE Composites Based on Molecular Dynamics

Cost-Effective Maintenance Policy for Sliding Surfaces of Bridge Bearings Using a Gamma Stochastic Process for Forecasting

Contact Info

Product

Resources

About

Tribological Behavior of PTFE Composites Filled with PEEK and Nano-Al2O3

Cited by 24 publications

References 38 publications

PEEK Composites as Self-Lubricating Bush Materials for Articulating Revolute Pin Joints

PEEK Composites as Self-Lubricating Bush Materials for Articulating Revolute Pin Joints

Tribological Properties of Nano-ZrO2 and PEEK Reinforced PTFE Composites Based on Molecular Dynamics

Cost-Effective Maintenance Policy for Sliding Surfaces of Bridge Bearings Using a Gamma Stochastic Process for Forecasting

Contact Info

Product

Resources

About

Tribological Behavior of PTFE Composites Filled with PEEK and Nano-Al₂O₃