Abstract
In this article, a laminate composite brake material was prepared by powder metallurgy techniques and proposed for use in the high-speed train braking system. The pad was a double-layer structure composed of prefabricated tribofilm (PTF, oxide-based materials) and metal-based materials. The friction and wear behaviors of the novel friction material with different thicknesses of PTF layer against steel rotor disc were investigated using a TM-I type braking dynamometer under initial braking speeds (IBS) of 50–350 km/h. It was found that the PTF pad exhibited stable friction behavior and wear rate in a large range of IBS (50–250 km/h), meeting the requirements of high-speed trains. During braking, the friction film formed on the worn surface was closely related to the friction and wear behavior. The PTF promoted the formation of a protective friction film, which provided a larger and flatter surface than that of metal-based materials. A relatively stable friction behavior and wear rate were maintained when the worn surface was covered with friction film.
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