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．

Effects of WC12Co Content on Wear Behavior of NiCoCrAlY Coating by Cold Gas Dynamic Spraying

2014 ◽  
Vol 1004-1005 ◽  
pp. 747-750
Author(s):  
Sheng Qiang Feng ◽  
Cun Long Wang ◽  
Bing Ma ◽  
Lang Cui
Keyword(s):  
Wear Resistance ◽  
Magnesium Alloy ◽  
Dry Friction ◽  
Wear Behavior ◽  
Cold Spraying ◽  
Friction Condition ◽  
High Density ◽  
Cold Gas Dynamic Spraying ◽  
Gas Dynamic ◽  
Cold Gas

The NiCoCrAlY+WC12Co coating with high density was prepared on the surface of the magnesium alloy by cold spraying. Effects of the WC12Co content on the wear behavior of coating were studied. The results showed that, under the dry friction condition, the weightlessness of wear of the coating with 20%WC12Co was smallest. The weightlessness of wear of the coating with 10%WC12Co was worse than that with 20%WC12Co. However, the weightlessness of wear of the coating without any WC12Co was worst among the three coatings. After the frictional experiment for 20 minutes, the weightlessness of wear of coating without any WC12Co was 10mg. Compared with that of coatings with 10%WC12Co and 20%WC12Co, the weightlessness of wear was lower than 35% and 54%, respectively. Obviously, the coating with 20%WC12Co had the capacity of the weightlessness of wear resistance. Consequently, the more the coating with WC12Co was, the higher the capacity of the weightlessness of wear resistance was.

Effect of Rare Earth Cerium on the Synthesis and Wear-Resistance of Electroless Ni-P-PTFE Coatings

2013 ◽  
Vol 750-752 ◽  
pp. 1996-2002 ◽  
Author(s):  
Da Yong Liu ◽  
Long Gen Li ◽  
Li Sheng Liu
Keyword(s):  
Wear Resistance ◽  
Rare Earth ◽  
Friction Coefficient ◽  
Interfacial Adhesion ◽  
Steel Surface ◽  
Energy Dispersive Spectrometer ◽  
Wear Test ◽  
Low Friction ◽  
Electroless Ni ◽  
Scanning Electron

By adding various concentrations of rare earth cerium into the acidic hypophosphite plating baths, electroless Ni-P-PTFE coatings have been successfully deposited on the surface of shaft made of mild steel. Surface morphology, microhardness and interfacial adhesion of the coatings were characterized by scanning electron microscope equipped with energy dispersive spectrometer, vicker microhardness meter and WS-92 scrape instrument, respectively. Ring-plate wear test was applied to study the friction coefficient and wear resistance of Ni-P-PTFE coating. Results revealed that Ni-P-PTFE coatings deposited with 10ppm or 20ppm cerium in the plating baths show low friction coefficient and high interfacial adhesion,leading to its perfect wear resistance. However, both the interfacial adhesion and wear resistance of the Ni-P-PTFE coatings were decreased drastically as the cerium concentration in the plating baths was exceeds 50ppm.

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.

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.

The Tribological Characteristics of Polyimide Bonded Solid Lubricating Films under Different Lubrication Conditions

2011 ◽  
Vol 399-401 ◽  
pp. 2026-2030 ◽  
Author(s):  
Yin Ping Ye ◽  
Rui Jie Yang ◽  
Hong Qi Wan ◽  
Jian Min Chen ◽  
Hui Di Zhou
Keyword(s):  
Wear Resistance ◽  
Diesel Fuel ◽  
Dry Friction ◽  
Friction And Wear ◽  
Friction Condition ◽  
Oil Lubrication ◽  
Lubricating Film ◽  
Lubrication Oil ◽  
Lubrication Conditions ◽  
Paraffin Liquid

In this paper, the tribological behaviors of polyimide bonded PTFE solid lubricating film and polyimide bonded MoS2 solid lubricating film under dry sliding and under lubrication of kerosene oil, diesel fuel, paraffin liquid and lubrication oil were investigated by using a ring-on-block wear tester. The results show that the anti-friction and wear-resistance properties of both lubricating films are greatly improved under oil lubrication conditions as compared with the dry friction condition; the friction coefficients of both lubricating films under different oil lubrications keep steady-state value with 0.08; but both lubricating films under different oil lubrications reveal the different wear-resistance properties, such as the best wear-resistance properties under diesel fuel, followed by paraffin liquid, lubrication oil and kerosene oil; the differences in the wear-resistance properties of the lubricating films under different lubrication conditions are mainly ascribed to the influence of the oil’s characteristics, especially boiling point and viscosity.

Improving the wear resistance of hoe blades by modifying of restoration coatings

2019 ◽  
Vol 24 (94/4) ◽  
pp. 27-32
Author(s):  
T.S. Skoblo ◽  
I.N. Rybalko ◽  
A.V. Tihonov ◽  
T.V. Maltsev
Keyword(s):  
Wear Resistance ◽  
Transition Layer ◽  
Surface Coating ◽  
Dry Friction ◽  
Raw Materials ◽  
Bentonite Clay ◽  
Magnetic Fraction ◽  
Cutting Surface ◽  
Agricultural Machines ◽  
Modifying Additive

The possibility of using a non-magnetic fraction of a detonation charge with a diamond fraction from the disposal of ammunition to modify the restoration coatings of a natural product – clay and secondary raw materials — was studied. Four different coating variants were investigated. For this, a T-620 electrode was used with its additional modification by coating with bentonite clay, as well as with a non-magnetic fraction of the detonation charge and applying it in the form of a slip coating on the cutting surface of the cultivator. It is shown that the use of such additives allows to increase the resistance of the working tool of agricultural machines, reduces its tendency to damage due to the minimum penetration of the thin-walled product of the hoe blade and a decrease in the cross section of the transition layer and the level of stress. Each modifier makes changes to increase the microhardness to varying degrees. An increase in microhardness is observed on the surface of the coating and its gradual decrease to the transition layer. The surface coating with the additional introduction of bentonite clay in a liquid bath has the highest microhardness. Its microhardness varies from HV-50-1009.7 to HV-50-615.2. Similarly, the effect of the modifying additive of the detonation charge, the microhardness varies from HV-50-969.6 to HV-50-633.26. When clay or a mixture is introduced into the restoration coating, the wear resistance increases by 1.3 - 2 times with respect to the deposited surfacing only by the electrode and by 2 - 3 times to the initial material of the cultivator. It was found that the lowest coefficient is characteristic for dry friction, as well as for hydroabrasive, for samples with additional modification with clay or a detonation charge

scholarly journals Magnetic Gears and Magnetically Geared Machines with Reduced Rare-Earth Elements for Vehicle Applications

2021 ◽  
Vol 12 (2) ◽  
pp. 52
Author(s):  
Ali Al-Qarni ◽  
Ayman EL-Refaie
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Permanent Magnet ◽  
Electric Vehicles ◽  
Scaling Up ◽  
Electrical Machines ◽  
Mechanical Structure ◽  
Physical Isolation ◽  
Rotational Components ◽  
Rare Earth Content

This paper covers a new emerging class of electrical machines, namely, Magnetic Gears (MGs) and Magnetically Geared Machines (MGMs). This particular kind of gears/machines is capable of either scaling up or down the revolutions-per-minute to meet various load profiles as in the case of mechanical gearboxes, but with physical isolation between the rotating components. This physical isolation between the rotational components leads to several advantages in favor of MGs and MGMs over mechanical gearboxes. Although MGs and MGMs can potentially provide a solution for some of the practical issues of mechanical gears, MGs and MGMs have two major challenges that researchers have been trying to address. Those challenges are the high usage of rare-earth Permanent Magnet (PM) materials and the relatively complex mechanical structure of MGs and MGMs, both of which are a consequence of the multi-airgap design. This paper presents designs that reduce the PM rare-earth content for Electric Vehicles (EVs). Additionally, the paper will ensure having practical designs that do not run the risk of permanent demagnetization. The paper will also discuss some new designs to simplify the mechanical structure.

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

Functionalized hexagonal-shaped potassium titanate/PA66 composite for improved wear resistance

2020 ◽  
Author(s):  
Hyung Jin Mun ◽  
Jae Ik Kim ◽  
Ki Dong Nam ◽  
Bo Ram Gu ◽  
Sung Hun Ryu
Keyword(s):  
Wear Resistance ◽  
Potassium Titanate

scholarly journals Improving the microstructure and mechanical properties of laser cladded Ni-based alloy coatings by changing their composition: A review

2020 ◽  
Vol 59 (1) ◽  
pp. 340-351
Author(s):  
Lin Yinghua ◽  
Ping Xuelong ◽  
Kuang Jiacai ◽  
Deng Yingjun
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
Rare Earth ◽  
Composite Coatings ◽  
Single Element ◽  
Properties Of Coatings ◽  
Hard Particles ◽  
Microstructure And Mechanical Properties ◽  
Nickel Based Alloy

AbstractNi-based alloy coatings prepared by laser cladding has high bonding strength, excellent wear resistance and corrosion resistance. The mechanical properties of coatings can be further improved by changing the composition of alloy powders. This paper reviewed the improved microstructure and mechanical properties of Ni-based composite coatings by hard particles, single element and rare earth elements. The problems that need to be solved for the particle-reinforced nickel-based alloy coatings are pointed out. The prospects of the research are also discussed.

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