Influence of SiO2/MoS2/graphite content on the wear properties of PTFE composites under natural seawater lubrication

2018 ◽  
Vol 232 (5) ◽  
pp. 607-618 ◽  
Author(s):  
Zhiqiang Wang ◽  
Shaofeng Wu ◽  
Jing Ni
Keyword(s):  
Wear Resistance ◽  
Laser Scanning ◽  
Natural Seawater ◽  
Wear Properties ◽  
Laser Scanning Confocal Microscope ◽  
Ptfe Composite ◽  
Seawater Lubrication ◽  
Friction Energy ◽  
Ptfe Composites ◽  
Test Table

The polytetrafluroethylene (PTFE) mixed with different particles, such as SiO2, MoS2, and graphite, were prepared by using cold briquetting and hot sintering technologies. In order to investigate the influence of different mixture ratios of particles on the wear properties of PTFE composite under natural seawater lubrication, 10 different samples were designed through orthogonal test table and evaluated using an MMU-5 G wear tester. For comparison, the wear experiments of pure PTFE were also carried out under the same conditions. Moreover, the 3D profiles and depth variations of wear scars of PTFE composites were observed by a laser scanning confocal microscope. Results showed that the addition of SiO2, MoS2, and graphite can greatly improve the wear resistance of PTFE under seawater lubrication. In particular, 10% SiO2, 15% MoS2, and 15% graphite filled with PTFE composite possesses the best wear resistance. And a synergistic effect is found for the combination of SiO2, MoS2, graphite, and seawater, which effectively prevents the slipping of PTFE from matrix, increases the adhesion resistance, decreases the friction energy, further results in lower wear rate and little damage on the surface of the PTFE composites.

Tribological Behaviors of Polymer Based Composites under Alkaline Conditions

2012 ◽  
Vol 510 ◽  
pp. 563-568
Author(s):  
Yan Ji Zhu ◽  
Hui Juan Qian ◽  
Gui Ying Wang ◽  
Huai Yuan Wang
Keyword(s):  
Wear Resistance ◽  
Frame Structure ◽  
Alkaline Condition ◽  
Wear Properties ◽  
Friction Coefficients ◽  
Wear Rates ◽  
Transfer Films ◽  
Peek Composite ◽  
Alkaline Conditions ◽  
Ptfe Composites

In this paper, polyetheretherketone (PEEK) and polytetrafluoroethylene (PTFE) based composites reinforced with various amounts of potassium titanate whiskers (PTWs) or short carbon fibers (CF) were designed and fabricated respectively. The friction and wear properties of PEEK and PTFE based composites sliding under rigorous alkaline were comparatively investigated. Also, the morphologies of the worn and counterpart surfaces were studied by scanning electron microscopy (SEM). Because of the stable tunnel crystal structure and frame structure micro-reinforcement capacity, PTWs show outstanding performances in increasing the wear resistance and reducing the friction coefficients of both PEEK and PTFE based composites under alkaline. However, CF leads to the degradation of wear resistance and the increase of friction coefficient of PEEK based composites under alkaline. Furrows and abrasive wear were the main mechanisms for CF/PTFE/PEEK and CF/PTFE composites sliding in alkali. The results show that PTW/PTFE composites exhibit higher wear resistance under lower load, while PTW/PTFE/PEEK composite is more suitable for higher load under alkaline condition. Owing to the primary cooling and boundary lubricating effects of alkali, the wear rates and friction coefficients of PTFE composites and PTW/PTFE/PEEK composites decreased obviously, though the transfer films onto the counterpart steel surface were hindered considerably.

Tribological behavior and morphology of PTFE particulate-reinforced POM matrix composites

2017 ◽  
Vol 37 (3) ◽  
pp. 227-237 ◽  
Author(s):  
Qi Liu ◽  
Wei Luo ◽  
Shengtai Zhou ◽  
Huawei Zou ◽  
Mei Liang
Keyword(s):  
Wear Resistance ◽  
High Speed ◽  
Friction And Wear ◽  
Thermodynamic Characteristics ◽  
Special Focus ◽  
Wear Properties ◽  
Scanning Calorimetry ◽  
Sliding Speed ◽  
Friction And Wear Properties ◽  
Ptfe Composites

Abstract The friction and wear properties of polyoxymethylene/polytetrafluoroethylene (POM/PTFE) composites were investigated by using a block-on-ring friction tester and special focus was paid to the effect of weight average molar mass (Mw) of POM. To study the thermodynamic characteristics and wear mechanism of composites, differential scanning calorimetry (DSC) and scanning electron microscopy (SEM) were used. Results showed that friction and wear properties of the composite blends were strongly affected by the Mw of POM and the loading fractions of PTFE. POM/PTFE composites with lower Mw of POM owned better wear resistance abilities under a high-speed sliding regime, which resulted from the effective lubrication of transferred wear debris under a relatively high sliding speed. However, the transfer layer on the counterface could be easily peeled off under the low sliding speed, resulting in higher wear rate of POM/PTFE composites with lower Mw of POM. POM and its composites with high Mw showed comparative high friction levels, related to the strong adhesion between the resin and the steel counterpart. DSC analysis showed that POM with lower Mw had higher crystallinity, which was beneficial to the improvement of wear resistance in a high-speed sliding condition.

Evaluation of Tribological Performance of PTFE Composite Filled with Rare Earth Treated Potassium Titanate Whiskers

2011 ◽  
Vol 415-417 ◽  
pp. 1252-1256
Author(s):  
Yu Fan ◽  
Qing Jun Ding ◽  
Chuan Hui Liu ◽  
Jia Ling Hu
Keyword(s):  
Wear Resistance ◽  
Rare Earth ◽  
Dry Friction ◽  
Interfacial Adhesion ◽  
Friction Condition ◽  
Optimum Amount ◽  
Ptfe Composite ◽  
Potassium Titanate ◽  
Ptfe Composites ◽  
Rare Earth Content

Optimum amount of rare earths (RE) for treating potassium titanate whiskers (PTW) surface and effects of different PTW contend on tribologieal behavior of Polytetrafluoroethylene (PTFE) composites under dry friction condition were investigated．Worn surfaces were observed and analyzed by scanning electron microscope(SEM)．Experimental results showed that the friction coefficient of PTW/PTFE composites increased with the content of PTW increasing, and the composites performed the best wear resistance occurs at 5wt% PTW content. Moreover, the composites filled with treated PTW performed the best wear resistance occurs at 0.2wt% rare earth content. Under dry friction condition, PTFE composites filled with treated PTW exhibit better tribologieal performance than those of the PTFE composite filled with untreated PTW did. Rare earth elements acting as surface modifier of PTW can increase interfacial adhesion and toughness between PTW and PTFE matrix, and it improves tribologieal performance of the composites．

scholarly journals Friction and wear behaviors of a high nitrogen austenitic stainless steel Fe-19Cr-15Mn-0.66N

2021 ◽  
pp. 25-25 ◽  
Author(s):  
Y.-X. Qiao ◽  
S.-L. Sheng ◽  
L.-M. Zhang ◽  
J. Chen ◽  
L.-L. Yang ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Wear Resistance ◽  
Electron Microscope ◽  
Austenitic Stainless Steel ◽  
Laser Scanning ◽  
Friction And Wear ◽  
Surface Hardness ◽  
High Nitrogen ◽  
Laser Scanning Confocal Microscope ◽  
Scanning Electron

The friction and wear behaviors of a Fe-19Cr-15Mn-0.66N high nitrogen austenitic stainless steel (HNSS) were investigated. Tribological investigations were carried out under different applied loads of 5 N, 10 N, 15 N and 20 N. Scanning electron microscope (SEM) and laser scanning confocal microscope (LSCM) were used to understand the wear mechanisms under different loads and the reasons for the improved wear resistance. The lower friction coefficient and improved wear resistance were observed with the increase in applied loads. Under a higher load, the friction enhanced the work hardening ability of HNSS, which in turn improved its surface hardness and thus the increased wear resistance of HNSS.

scholarly journals The Tribological and Sealing Properties of PFA Composites

2018 ◽  
Vol 2018 ◽  
pp. 1-6
Author(s):  
Ye Sujuan ◽  
Yu Quan ◽  
Li Kunquan ◽  
Tan Feng ◽  
Fan Qing ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Carbon Fiber ◽  
Wear Rate ◽  
Glass Fiber ◽  
Vinyl Ether ◽  
Transfer Film ◽  
Test Rig ◽  
Wear Rates ◽  
Ptfe Composite ◽  
Ptfe Composites

The polytetrafluoroethylene (PTFE) and perfluoroalkoxyperfluoropropyl vinyl ether (PFA) composites were prepared using carbon fiber (CF) and glass fiber (GF) as fillers. The effects of these fillers on the tribological and sealing properties were investigated. The tribological and sealing properties of the composites were evaluated by a wear tester and a seal test rig. Results showed that the incorporation of CF and GF both improved the wear resistance with composites, approaching wear rates as low as 10−6 mm3/N·m and lowered the seal’s leakage of the PTFE/PFA composites. As described here, CF was more effective than GF in improving the wear rate. Notably, the wear rate of the PFA/CF composite is much less than that of the PTFE composites as the transfer film on the couple ring is much more unique, thick, smooth, and compact. The leakage of carbon fiber-filled PFA composite seal was lowered to 66% less than the traditional PTFE composite seals, which indicates better sealing properties.

scholarly journals Effect of Boron Carbide Addition on Wear Resistance of Aluminum Matrix Composites Fabricated by Stir Casting and Hot Rolling Processes

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 989
Author(s):  
Donghyun Lee ◽  
Junghwan Kim ◽  
Sang-Kwan Lee ◽  
Yangdo Kim ◽  
Sang-Bok Lee ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Boron Carbide ◽  
Hot Rolling ◽  
Rolling Direction ◽  
Aluminum Matrix ◽  
Stir Casting ◽  
Aluminum Matrix Composites ◽  
Wear Depth ◽  
Wear Properties ◽  
B4c Particles

In this study, to evaluate the effect of boron carbide (B4C) addition on the wear performance of aluminum (Al), Al6061 and 5, 10, and 20 vol.% B4C/Al6061 composites were manufactured using the stir casting and hot rolling processes. B4C particles were randomly dispersed during the stir casting process; then, B4C particles were arranged in the rolling direction using a hot rolling process to further improve the B4C dispersion and wear resistance of the composites. Furthermore, a continuous interfacial layer between B4C and the Al6061 matrix was generated by diffusion of titanium (Ti) and chromium (Cr) atoms contained in the Al6061 alloy. Wear depth and width of the composites decreased with increasing B4C content. Furthermore, with B4C addition, coefficient of friction (COF) improved as compared with that of Al6061. The results indicate that interface-controlled, well-aligned B4C particles in the friction direction can effectively increase the wear properties of Al alloys and improve their hardness.

Hydrophobicity and wear resistance of ceria/PTFE composite coatings

2020 ◽  
Vol 17 (6) ◽  
pp. 1549-1557
Author(s):  
Xiao-yan Shao ◽  
Li-na Zhu ◽  
Wen Yue ◽  
Jia-jie Kang ◽  
Guo-zheng Ma ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Composite Coatings ◽  
Ptfe Composite

A review on recent advances on improving polyimide matrix nanocomposites for mechanical, thermal, and tribological applications: Challenges and recommendations for future improvement

2021 ◽  
pp. 089270572110079
Author(s):  
Victor E Ogbonna ◽  
Patricia I Popoola ◽  
Olawale M Popoola ◽  
Samson O Adeosun
Keyword(s):  
Wear Resistance ◽  
High Strength ◽  
Weight Percent ◽  
Wear Properties ◽  
Mechanical And Tribological Properties ◽  
Friction Component ◽  
Future Improvement ◽  
Component Material ◽  
Percent Concentration ◽  
Polyimide Matrix

In recent years, advancements on improving the mechanical and tribological properties of polyimide nanocomposites have remarkably increased, owing to the fact that polyimide nanocomposites exhibits lightweight, high strength, thermal stability as well as anti-wear and solvent resistance. The polyimide nanocomposites are described as material of polyimide matrix reinforced with certain volume or weight percent concentration of nanofillers. Researchers have demonstrated the importance of thermoplastic polyimide nanocomposites in mechanical, thermal, and tribological applications. However, the nanocomposites are reportedly facing interfacial adhesion issues and surface properties degradation, which have affected their mechanical, friction, and abrasive wear resistance for tribological applications. Although, much advancements on improving the mechanical, thermal, and wear resistance properties of polyimide nanocomposites has been reported. However, this review summarizes the effects of nanofillers, such as carbon nanotubes (CNTs), graphene (GN), graphene oxide (GO), boron nitride (BN), molybdenum disulfide (MoS2), silica (SiO2), titania (TiO2), alumina (Al2O3), carbon fibres (CF), aramid fibre (AF), glass fibre (GF), zinc dioxide (ZnO2), zirconium dioxide (ZrO2), silicon nitride (Si2N4), and carbon nitride (C3N4) on the mechanical, thermal, and wear properties of polyimide nanocomposites for tribological applications. The authors concluded the review study with advancement, challenges and suggestions for future improvement of polyimide nanocomposites as friction component material. Thus, the review offers an insight into the improvement and selection of polyimide nanocomposites material for mechanical, thermal, and tribological applications. More so, the review will also give away for further research.

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