Abstract
In this study, the effects of granularity and proportion of CrFe on both braking performance and dynamic characteristics of copper-based friction materials were investigated. Braking tests and analyses of microstructure, elements, and vibration were conducted. Braking performance was evaluated using a scale pin-on-disc testing machine. Dynamic response was investigated by piezoelectric accelerometer and vibration signal analysis. Results show that the material containing 10% fine ferrochrome particles has the most stable friction coefficient and the lowest wear rate, particularly at high speeds (300–350 km/h). Moreover, by increasing the fine chromium iron content, high-frequency vibration and squeal noise are suppressed. Scanning electron microscopy, energy-dispersive X-ray spectroscopy, and laser scanning confocal microscopy were also conducted. Vibration signals were analyzed using fast Fourier Transform. These tests reveal the mechanism of the appropriate CrFe size and content to improve the braking ability and steadiness of pads for high-speed trains. This research is anticipated to be used as a beneficial reference for the design and manufacture of high-performance and environmentally friendly brake pads.
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