Tribological behaviours of bronze-filled polytetrafluoroethylene dry journal bearings

Tevrüz, Talat

doi:10.1016/s0043-1648(99)00091-5

Cited by 67 publications

(34 citation statements)

References 17 publications

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“…Such research often incorporates hard filler particles into the PTFE matrix such as glass fibers [2], copper [3], ceramics [4], carbon fibers [5], chopped carbon fibers [6] and nano particles [7,8] in an effort to enhance the wear resistance. Other research groups incorporate fillers that may act as additional solid lubricants such as bronze [9,10], graphite [3], carbon nanotubes [11], molybdenum and tungsten disulfide [12], lead [13][14][15], and boric-oxide [16] to improve wear resistance while retaining low friction coefficients. PTFE is also frequently used as filler in polymeric materials that have good mechanical properties but poor tribological properties, such as polyoxymethylene [17,18], epoxy [19], polyetheretherketone [20], and polyimide [21].…”

Section: Introductionmentioning

confidence: 99%

Wear resistant solid lubricant coating made from PTFE and epoxy

et al. 2005

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A composite coating of polytetrafluoroethylene and epoxy shows 100 · improvements in wear resistance as compared to either of its constituents alone and reduced friction coefficient under testing on a pin-on-disk tribometer. This coating is made by impregnating an expanded PTFE film with epoxy, which provides three unique functions: (1) the epoxy compartmentalizes the PTFE nodes, which is believed to reduce the wear of the PTFE, (2) the epoxy increases the mechanical properties such as elastic modulus and hardness, and (3) the epoxy provides a ready interface to bond the films onto a wide variety of substrates easily and securely. The experimental matrix had normal loads of 1-3 N, sliding speeds from 0.25 to 2.5 m/s, and used a 2.4 mm radius low carbon steel pin in a rotating pin-on-disk tribometer. The skived PTFE films had wear rates on the order of K ¼ 10 )3 mm 3 /Nm and friction coefficients around l ¼ 0.2. Both the high density films (70 wt%PTFE) and low density films (50 wt% PTFE) had wear rates on the order of K ¼ 10 )6 mm 3 /Nm and friction coefficients around l ¼ 0.15. The neat epoxy films showed significant scatter in the tribological measurements with wear-rates on the order of K ¼ 10 )4 mm 3 /Nm and friction coefficients around l ¼ 0.40. The enhanced tribological behavior of these composites is believed to stem from the coatings ability to draw thin PTFE transfer films into the contact from the nodes of PTFE, which act like reservoirs. Nanoindentation mapping of the coatings and the transfer films supports this hypothesis, and accompanies scanning electron microscopy observations of the worn and unworn coatings.

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Section: Introductionmentioning

confidence: 99%

Wear resistant solid lubricant coating made from PTFE and epoxy

et al. 2005

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“…The low friction coefficient of PTFE is caused by the tribo-film transferred to the contact surface on the counterpart [6,10]. Generally, filling the PTFE with particles increases its friction coefficient, because the fillers have a much higher friction coefficient than the PTFE matrix and act as abrasives [1][2][3][4][5][6][7][8][9][10]. However, in this experiment, the addition of carbon nanoparticles to the PTFE did not increase its friction coefficient, because the nanodiamonds and carbon onions behave like a solid lubricant itself having a low friction coefficient.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, many researchers have attempted to reinforce PTFE using various fillers. Glass fibers, carbon fibers, and nonferrous metallic and ceramic powders were studied as potential fillers for the enhancement of the wear resistance of PTFE, but it was proven that these fillers induced a large frictional coefficient and abrasion of the fractured fiber [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Tribological behavior of PTFE nanocomposite films reinforced with carbon nanoparticles

Lee

Lim

2007

Composites Part B: Engineering

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“…They also showed that applied load has more effect on the wear than the speed for composites. Several authors [17][18][19][20][21][22] observed that the friction coefficient of polymers and its composites rubbing against metals decreases with the increase in load though some other researchers have different views. Stuart [23] and other researchers [24][25][26] showed that value of friction coefficient increases with the increase in load.…”

Section: Introductionmentioning

confidence: 99%