Synergistic effects of aramid pulp and potassium titanate whiskers in the automotive friction material

Kim, S.J.; Cho, Min Hyung; Lim, Dae Soon; Jang, Hae‐Dong

doi:10.1016/s0043-1648(01)00802-x

Cited by 176 publications

(96 citation statements)

References 15 publications

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“…contents of the constituents, may influence certain properties of the composite. However, as these relations are of very complex nature, this knowledge is often empirical and mostly qualitative rather than quantitative [2,3].…”

Section: Introductionmentioning

confidence: 99%

Comparative Study on the Effect of Fibre Substitution on the Properties of Composite Railway Brake Shoe

Wasilewski

Kuciej²

2017

Proccedings of International Scientific Conference "BALTTRIB 2017"

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During the design process, railway friction materials are subject to extensive testing which allows for a thorough assessment of their compliance with versatile requirements and expected characteristics. These tests include, among other, laboratory tests of mechanical, physicochemical, thermophysical and tribological properties. For a designer it is crucial to understand how formulation modification influences characteristics of the friction material. One of the key ingredients in the formulation of friction materials is reinforcing fibre. In this study, two composite, organic railway brake shoes with equal amount of two different reinforcing fibres, namely steel wool and glass fibre, were tested according to the procedures of a railway friction materials manufacturer. Test results were analysed and compared. The substitution of reinforcing fibre had a noticeable effect on each of the properties of the composites considered in this study.

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Section: Introductionmentioning

confidence: 99%

Comparative Study on the Effect of Fibre Substitution on the Properties of Composite Railway Brake Shoe

Wasilewski

Kuciej²

2017

Proccedings of International Scientific Conference "BALTTRIB 2017"

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“…Literature shows that hardness of the composites were not consistent with the composition and no correlation was observed between hardness and tribological properties of the friction composites. 37 Water absorption and compressibility of the composites increases with increase in nanoclay and MWCNT contents. Heat swelling, shear strength and hardness of the investigated composites did not show any regular trend with the composition.…”

Section: -5mentioning

confidence: 96%

Friction Braking Performance of Nanofilled Hybrid Fiber Reinforced Phenolic Composites: Influence of Nanoclay and Carbon Nanotubes

Singh

Patnaik

Satapathy

2013

NANO

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Graphite lubricated phenolic-based friction composites¯lled with nanoclay and Multiwalled carbon nanotubes (MWCNT) and reinforced with lapinus and Kevlar¯bers have been successfully fabricated for evaluation of their physical, chemical, mechanical and tribological properties, respectively. The increase in nanoclay and MWCNT contents led to the increase in bulk physical properties such as void contents, ash contents, water absorption and compressibility. The impact, tensile and°exural strengths get a®ected deleteriously when complemented by lapinus and kevlar¯bers in the composites. However, with the increase in nanoclay and MWCNT contents the -performance, friction fade resistance and friction recovery enhanced whereas, friction°u ctuations, stability and variability coe±cients have been observed to be dependent on the composition. The addition of nanoclay and MWCNT raises the disc temperature whereas wear resistance of the friction composites increases with the decreasing in nanoclay and MWCNT contents. Comprehensively, it is found that with the higher nanoclay: MWCNT ratio (i.e., 1.375:1.375 wt.%) overall frictional response ( p ¼ 0:386) is enhanced, showed lowest fading (fade ¼ 22:80%) and excellent recovery performance (recovery ¼ 130:37%). Finally, the wear surface morphology studies have been done by using scanning electron microscope (SEM) to analyze the wear mechanisms qualitatively by understanding nature of the friction contact patches.

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“…In general, the reinforcement tends to deteriorate the friction film formed between the worn surfaces of sample and the counterpart [7,8]. This may be the reason that the Aramid particle filled composites had a relatively higher cof than the composites only filled with TiO 2 and graphite.…”

Section: Wear Testsmentioning

confidence: 99%

Development of Tribologically Optimized Surface Coatings with Micro and Nano Particles

Xian

Walter

Haupert³

2004

Materialwissenschaft Werkst

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This paper is focused on the tribological behaviour of epoxybased coatings applied to metal substrates. Aramid particles, nanometer-sized Titanium dioxide (TiO 2 ), graphite and Polytetrafluoroethylene (PTFE) served as filler materials. Under sliding conditions, incorporation of Aramid particles to the graphite and TiO 2 filled composites improved the wear resistance significantly, but it slightly increased the coefficient of friction (cof). Under fretting wear conditions, 10 vol.% Aramid particles filled composite showed the lowest wear rate and cof. To further improve the wear performance, PTFE (2 -6 vol.%) was introduced to the above-optimized composition (10 vol.% Aramid particles, graphite and TiO 2 ). However, both the sliding and fretting wear resistance was impaired, and cof was increased. Deterioration of the mechanical properties and the friction films were attributed to the unusual trend. Finally, the optimal composition for epoxy-based coatings was determined as 10 vol.% Aramid particles together with graphite and nano-TiO 2 filled composite.Keywords: Aramid, epoxy, nanocomposite, wear and friction, sliding, fretting Im Rahmen dieser Arbeit wird das tribologische Verhalten von polymeren Gleitschichten auf Epoxidharzbasis, welche mit Aramidpartikeln, nanoskaligem Titandioxid (TiO 2 ), Graphit und Polytetrafluorethylen (PTFE) gefüllt sind, näher betrachtet. Unter Gleitverschleißbedingungen wird die Verschleißfestigkeit von graphitund TiO 2 -gefüllten Verbunden durch die Zugabe von Aramidpartikeln weiter verbessert, während sich allerdings der Reibungskoeffizient leicht erhöht. Unter Schwingverschleißbedingungen zeigte der mit 10 vol.% Aramid gefüllte Verbund den günstigsten Reibungskoeffizienten und die niedrigste Verschleißrate. Um die tribologischen Eigenschaften weiter zu verbessern, wurde diesem Verbund dann nochmals 2-6 vol.% PTFE zugemischt. In diesem Falle kam es jedoch zu einer Verschlechterung, sowohl des Gleitverschleiß-als auch des Schwingverschleißverhaltens. Der Grund hierfür lag in der Herabsetzung der mechanischen Werkstoffeigenschaften. Die im Rahmen dieser Arbeit optimale Zusammensetzung der Gleitschicht war, in Kombination mit Graphit und nanoskaligem TiO 2 , ein mit 10 vol.% aramidpartikelgefüllter Epoxydharz.

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Synergistic effects of aramid pulp and potassium titanate whiskers in the automotive friction material

Cited by 176 publications

References 15 publications

Comparative Study on the Effect of Fibre Substitution on the Properties of Composite Railway Brake Shoe

Comparative Study on the Effect of Fibre Substitution on the Properties of Composite Railway Brake Shoe

Friction Braking Performance of Nanofilled Hybrid Fiber Reinforced Phenolic Composites: Influence of Nanoclay and Carbon Nanotubes

Development of Tribologically Optimized Surface Coatings with Micro and Nano Particles

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