Abstract
Copper-based friction material (CFM) and paper-based friction material (PFM) are the two most commonly used clutch friction materials. The friction and wear characteristics of these two kinds of friction materials under dry conditions were investigated by the pin-on-disc test over a broad range of applied loads, rotating speeds and ambient temperatures. Before experiments, the running-in test was conducted to stabilize the coefficient of friction (COF) and wear amount of the test samples. After experiments, the metallographic micrographs of the tested samples were presented to investigate the wear mechanisms. Experimental results showed that both the COF and wear depth of the CFM are much greater than these of PFM. The COF of CFM decreases with the increase of applied load, and changes slightly with the variation of rotating speed, whereas it increases first and then decreases with the increase of ambient temperature. However, the COF of PFM decreases dramatically with the increase of the rotating speed and ambient temperature, while it remains stable at first and then decreases slowly as the applied load increases. Additionally, under such three working conditions, the wear depth of CFM changes linearly, while the wear depth of PFM varies greatly. This study can be used as a guide for selecting friction materials for clutches with different applications.
Highlights
Friction materials play a significant role in the clutch system [1,2]
In order to evaluate and compare the friction and wear characteristics of the Copper-based friction material (CFM) and paper-based friction material (PFM) during the clutch engagement process in the dry condition, the pin-on-disc tests are conducted with applied load, rotating speed and ambient temperature taken into account
The failure of CFM is caused by the variation of wear mechanism
Summary
The friction properties of friction materials have a direct influence on the thermodynamic performance of the clutch, determining the reliability and safety of the entire vehicle [3]. Kovalchenko et al [9] studied the influence of the molybdenum disulfide and molybdenum diselenite on the friction and wear mechanisms of CFM under the dry condition. Studied the effect of sintering temperature on the mechanical and tribological characteristics of the train brake pads; they found that high sintering temperature is helpful to increase the COF and reduce the wear amount. Fei et al [19] studied the influence of the carbon fiber content on the friction and wear performance of PFM. The influence of the working conditions (applied load, rotating speed and ambient temperature) on the variations of COFs and wear depths of friction materials is presented. The conclusions provide guidance for selecting suitable friction materials for clutches with different applications
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