A pin-on-disc study on the dry sliding behavior of a Cu-free friction material containing different types of natural graphite

Leonardi, Mara; Alemani, Mattia; Straffelini, Giovanni; Gialanella, Stefano

doi:10.1016/j.wear.2019.203157

Cited by 36 publications

(26 citation statements)

References 32 publications

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“…Leonardi et al stated that the size of the graphite particles also influences the tribological properties. The highest value of the friction coefficient (0.62±0.02) was recorded for the grains of 100 µm, while the lowest value of wear rate (4.2±0.2 m 2 /N) for the smallest ones (below 40 µm) [182]. Moreover, the particle size also influences TL (thermal localisation phenomenon).…”

Section: Abrasivesmentioning

confidence: 93%

Conventional and unconventional materials used in the production of brake pads – review

Borawski

2020

Science and Engineering of Composite Materials

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Brakes are one of the most important components of vehicle. The brake system must be reliable and display unchanging action throughout its use, as it guards the health and life of many people. Properly matched friction pair, a disc and brake pad (in disc brakes), have a great impact on these factors. In most cases, the disc is made of grey cast iron. The brake pads are far more complex components. New technologies make it possible to develop materials with various compositions and different proportions, and connect them permanently in fully controllable processes. This elaboration shows that all these factors have a greater or lesser impact on the coefficient of friction, resistance to friction wear and high temperature, and brake pad’s operating life. This review collects the most important, the most interesting, and the most unconventional materials used in production of brake pads, and characterizes their impact on the tribological properties of pads.

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Section: Abrasivesmentioning

confidence: 93%

Conventional and unconventional materials used in the production of brake pads – review

Borawski

2020

Science and Engineering of Composite Materials

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“…The content of 9 wt.% of graphite was selected intentionally based on our previous experience with this component [40]. The formulations were mixed for 20 min using the shaker mixer TURBULA ® T 2 F (Willy A. Bachofen AG, Muttenz, Switzerland).…”

Section: Modification Of the Master Batch With Gcn And Gmentioning

confidence: 99%

“…A preliminary 30 min long bedding procedure was conducted to allow conformal contact between the pin and the disc surfaces and to remove the coarser surface asperities. To assess the friction-wear performance of the samples at elevated temperatures, testing of the composites at high temperature (HT) was also carried out following the procedure established by Leonardi et al [40]. The high-temperature tests were carried out using an induction heating apparatus enclosing the pin-on-disc testing chamber to heat the disc at 400 • C. To reveal the recovery performance, further tests were conducted at room temperature (H_RT) on the same specimens obtained after the HT tests were conducted.…”

Section: Pin-on-disc Testsmentioning

confidence: 99%

“…disc surfaces and to remove the coarser surface asperities. To assess the friction-wear performance of the samples at elevated temperatures, testing of the composites at high temperature (HT) was also carried out following the procedure established by Leonardi et al [40]. The high-temperature tests were carried out using an induction heating apparatus enclosing the pin-on-disc testing chamber to heat the disc at 400 °C.…”

Section: Characterisation Of Gcnmentioning

confidence: 99%

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The Role of Graphitic Carbon Nitride in the Formulation of Copper-Free Friction Composites Designed for Automotive Brake Pads

Matějka

Leonardi

Praus

et al. 2022

Metals

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In this study, graphitic carbon nitride (g-C3N4, labelled as gCN) was tested in the formulation of copper-free (Cu-free) friction mixtures, which are potentially interesting for brake pad manufacturing. Three formulations of friction composites were prepared starting from a common Cu-free master batch: (i) without graphite, (ii) with graphite and (iii) with gCN. The mixtures were pressed in the form of pins by hot-press moulding. The friction-wear performance of the prepared pins was investigated using a pin-on-disc (PoD) test at room temperature (RT), high temperature (HT) (400 °C) and, again, at room temperature (H-RT). The values of the friction coefficient (µ) for the composites with gCN (or graphite) were as follows: (i) RT test, µRT = 0.52 (0.47); (ii) HT test, µHT = 0.37 (0.37); (iii) RT after the HT tests, µH-RT = 0.49 (0.39). With respect to wear resistance, the samples with graphite performed better than the samples without this solid lubricant. To the best of our knowledge, this is the first report regarding the evaluation of the role of gCN in friction composites designed for automotive brake lining applications. The results indicate the main role of gCN as a soft abrasive.

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“…The traditional manufacturing process of graphite forms pores in its matrix and on its surface. This is to improve the mechanical strength of graphite and expand its application with the optimized tribological performance under any sealing conditions and invulnerable to the friction-induced heating and excessive wear [10,11]. The porous graphite can be impregnated with metal, polymer, or inorganic salt.…”

Section: Introductionmentioning

confidence: 99%

Insights on the Formation Mechanism of Ultra-Low Friction of Phenolic Resin Graphite at High Temperature

et al. 2021

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In the present paper, the influences of high temperature on the tribological properties of phenolic resin graphite (PRG) sliding against tungsten carbide-nickel (WC-Ni) alloy in ambient air were investigated systematically. Results demonstrated that the antifriction behaviors of PRG was sensitive to high temperature and PRG exhibits ultra-low coefficient of friction (CoF) of about 0.01–0.015. The low CoF is attributed to the formation of graphite tribofilms, which shows different formation processes on the contact interface at different temperatures (room temperature, 200, 300 and 400 °C). These findings provide insight into the formation mechanism of graphite tribofilms, and provide an important basis for improving the tribological properties of graphite-based friction materials and manufacturing new graphite for seal applications.

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A pin-on-disc study on the dry sliding behavior of a Cu-free friction material containing different types of natural graphite

Cited by 36 publications

References 32 publications

Conventional and unconventional materials used in the production of brake pads – review

Conventional and unconventional materials used in the production of brake pads – review

The Role of Graphitic Carbon Nitride in the Formulation of Copper-Free Friction Composites Designed for Automotive Brake Pads

Insights on the Formation Mechanism of Ultra-Low Friction of Phenolic Resin Graphite at High Temperature

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