Tribological behaviors of carbon series additions reinforced CF/PTFE composites at high speed

2016 ◽  
Vol 133 (20) ◽  
pp. n/a-n/a ◽  
Author(s):  
Pengpeng Ye ◽  
Jian Wu ◽  
Liwen Mu ◽  
Dafang He ◽  
Xin Feng ◽  
...  
Keyword(s):  
High Speed ◽  
Tribological Behaviors ◽  
Ptfe Composites ◽  
Carbon Series

scholarly journals Tribological behaviors of turbofan seal couples from friction heat perspective under high-speed rubbing condition

Friction ◽  
2016 ◽  
Vol 4 (2) ◽  
pp. 176-190 ◽  
Author(s):  
Siyang Gao ◽  
Weihai Xue ◽  
Deli Duan ◽  
Shu Li
Keyword(s):  
High Speed ◽  
Friction Heat ◽  
Tribological Behaviors ◽  
Rubbing Condition

High-Speed Dry Tribological Behaviors of CrNiMo Steel in Nitrogen and Oxygen Atmospheres

2011 ◽  
Vol 704-705 ◽  
pp. 877-885
Author(s):  
San Ming Du ◽  
Yong Zhen Zhang ◽  
Bao Shangguan
Keyword(s):  
Abrasive Wear ◽  
Tribological Properties ◽  
Wear Mechanism ◽  
Wear Mechanisms ◽  
High Speed ◽  
Normal Load ◽  
Dry Sliding ◽  
Tribological Behaviors ◽  
Electron Dispersion ◽  
Worn Surface

Abstract: In this article, the high-speed dry sliding tribological behaviors of CrNiMo steel against brass in nitrogen and oxygen atmospheres are investigated using a pin-on-disc tribometer. The worn surface is characterized by scanning electron microscopy and electron dispersion spectrums analysis. The wear mechanisms of CrNiMo steel are also analyzed. The results indicate that the tribological properties of CrNiMo steel are coincidental with the law of dry sliding of metal, where the friction coefficients decreases with an increase in sliding speed and with normal load. However, the atmosphere has obvious effects on the tribological properties of CrNiMo steel. In the sliding process, friction heat plays an important role on the tribological properties of materials in high-speed dry friction. The high-speed wear mechanism of CrNiMo steel varies at different atmospheres. In a nitrogen atmosphere, the wear mechanism of CrNiMo steel is mainly characterized by adhesion at a lower speed and load. When the speed and load are increased, melting trace is found in the worn surface accompanied by an abrasive wear. In an oxygen atmosphere, the mechanism is characterized by adhesion at a lower speed and load; with an increase in speed and load, it gradually transformed into oxidation wear and abrasive wear. The difference of the wear mechanisms in the different atmospheres and test parameters is primarily due to the transfer films formed on the contact surfaces of the sliding pairs. In our experimental conditions, the surface film is mainly the metal film in nitrogen, whereas, it is the oxide film in oxygen.

scholarly journals Tribological behaviors of Gra./Cu and CNTs/Cu composites with and without electric current

2018 ◽  
Vol 175 ◽  
pp. 01031
Author(s):  
Wei Xu ◽  
Binghong Li
Keyword(s):  
Powder Metallurgy ◽  
Electric Current ◽  
Tribological Properties ◽  
High Speed ◽  
Friction Coefficients ◽  
Wear Rates ◽  
Tribological Behaviors ◽  
Testing Condition ◽  
Worn Surfaces

Gra./Cu composites and CNTs/Cu composites were respectively fabricated by powder metallurgy techniques. The experiments of high speed sliding with and without electric current were carried out to investigate their tribological behaviors. The results show that the friction coefficients and wear rates with electric current are higher than without electric current; under the same testing condition the friction coefficients and wear rates of CNTs/Cu are lower and the worn surfaces are more planar than Gra./Cu. CNTs can debase the effect of heat generating during sliding process on the composites. The tribological properties of CNTs/Cu composites are more excellent than Gra./Cu composites.

Mechanical and tribological behaviors of copper metal matrix composites for brake pads used in high-speed trains

2018 ◽  
Vol 119 ◽  
pp. 585-592 ◽  
Author(s):  
Yelong Xiao ◽  
Zhongyi Zhang ◽  
Pingping Yao ◽  
Kunyang Fan ◽  
Haibin Zhou ◽  
...  
Keyword(s):  
Metal Matrix Composites ◽  
Metal Matrix ◽  
High Speed ◽  
Matrix Composites ◽  
Copper Metal ◽  
Brake Pads ◽  
Tribological Behaviors ◽  
High Speed Trains

The tribological behaviors of copper-coated graphite filled PTFE composites

Wear ◽  
2000 ◽  
Vol 237 (1) ◽  
pp. 33-38 ◽  
Author(s):  
Fei Li ◽  
Feng-yuan Yan ◽  
Lai-gui Yu ◽  
Wei-min Liu
Keyword(s):  
Tribological Behaviors ◽  
Ptfe Composites

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.

scholarly journals Investigation on Mechanical Properties and Reaction Characteristics of Al-PTFE Composites with Different Al Particle Size

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Jia-xiang Wu ◽  
Xiang Fang ◽  
Zhen-ru Gao ◽  
Huai-xi Wang ◽  
Jun-yi Huang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
High Speed ◽  
Structural Characteristics ◽  
Testing Machine ◽  
Strain Rate Range ◽  
Drop Weight ◽  
Hardening Modulus ◽  
Reaction Characteristics ◽  
Ptfe Composites

Al-PTFE (aluminum-polytetrafluoroethylene) serves as one among the most promising reactive materials (RMs). In this work, six types of Al-PTFE composites with different Al particle sizes (i.e., 50 nm, 1∼2 μm, 6∼7 μm, 12∼14 μm, 22∼24 μm, and 32∼34 μm) were prepared, and quasistatic compression and drop weight tests were conducted to characterize the mechanical properties and reaction characteristics of Al-PTFE composites. The reaction phenomenon and stress-strain curves were recorded by a high-speed camera and universal testing machine. The microstructure of selected specimens was anatomized through adopting a scanning electron microscope (SEM) to correlate the mesoscale structural characteristics to their macroproperties. As the results indicated, in the case of quasistatic compression, the strength of the composites was decreased (the yield strength falling from 22.7 MPa to 13.6 MPa and the hardening modulus declining from 33.3 MPa to 25 MPa) with the increase of the Al particle size. The toughness rose firstly and subsequently decreased and peaked as 116.42 MJ/m3 at 6∼7 μm. The reaction phenomenon occurred only in composites with the Al particle size less than 10 μm. In drop weight tests, six types of specimens were overall reacted. As the Al particle size rose, the ignition energy of the composites enhanced and the composites turned out to be more insensitive to reaction. In a lower strain rate range (10−2·s−1∼102·s−1), Al-PTFE specimens take on different mechanical properties and reaction characteristics in the case of different strain rates. The formation of circumferential open cracks is deemed as a prerequisite for Al-PTFE specimens to go through a reaction.

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