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Research Article | Open Access

Role of titanium carbide and alumina on the friction increment for Cu-based metallic brake pads under different initial braking speeds

Tao PENG, Qingzhi YAN( ), Xiaolu ZHANG, Yan ZHUANG
Laboratory of Special Ceramics and Powder Metallurgy, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
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Abstract

To understand the effect of abrasives on increasing friction in Cu-based metallic pads under different braking speeds, pad materials with two typical abrasives, titanium carbide (TiC) and alumina (Al2O3), were produced and tested using a scale dynamometer under various initial braking speeds (IBS). The results showed that at IBS lower than 250 km/h, both TiC and Al2O3 particles acted as hard points and exhibited similar friction-increasing behavior, where the increase in friction was not only enhanced as IBS increased, but also enhanced by increasing the volume fraction of the abrasives. However, at higher IBS, the friction increase was limited by the bonding behavior between the matrix and abrasives. Under these conditions, the composite containing TiC showed a better friction-increasing effect and wear resistance than the composite containing Al2O3 because of its superior particle-matrix bonding and coefficient of thermal expansion (CTE) compatibility. Because of the poor interface bonding between the matrix and Al2O3, a transition phenomenon exists in the Al2O3-reinforced composite, in which the friction-increasing effect diminished when IBS exceeded a certain value.

Keywords

brake padshigh-speed trainfriction mechanismsabrasives

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Friction
Volume 9 Issue 6,
December 2021
Pages 1543-1557
DOI: 10.1007/s40544-020-0439-3
Cite this article:
PENG T, YAN Q, ZHANG X, et al. Role of titanium carbide and alumina on the friction increment for Cu-based metallic brake pads under different initial braking speeds. Friction, 2021, 9(6): 1543-1557. https://doi.org/10.1007/s40544-020-0439-3

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Received: 10 August 2019
Revised: 25 November 2019
Accepted: 03 August 2020
Published: 25 November 2020
© The author(s) 2020

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