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The braking behaviors of Cu-Based powder metallurgy brake pads mated with C/C–SiC disk for high-speed train
Wear ( IF 5 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.wear.2020.203237
Sanqing Zhao , Qingzhi Yan , Tao Peng , Xiaolu Zhang , Yuying Wen

Abstract The improvement of braking systems for the high-speed train is driven by the demand for high & stable coefficient of friction (COF) as well as low wear at high speed. Given to the fading COF and severe wear of powder metallurgy (P/M) pad mated steel disk serving high-speed train in present, C/C–SiC ceramic materials are regarded as a strong candidate for braking disk due to the excellent strength, fracture toughness coupled with relatively low density. The fundamental understanding of the braking behavior at different braking speeds should be clarified for optimal application. In this work, P/M pads and C/C–SiC ceramic disk were prepared, braking tests with the initial braking speeds (IBS) of 15, 22, 30, 37, 46, 55, 59, 64, 69 m/s were conducted, and the surface development, friction & wear behavior were analysed. The COF vs. IBS curve shows a three-stage changing based on the turning points due to the contact patches continuously forming, growing and degrading: it went down and reached a low point with a value of 0.443 at 37 m/s, then increased gradually and reached the maximum 0.486 at 55 m/s, then little fell to 0.460 at 69 m/s. In the great scope of braking speeds, P/M pads mated C/C–SiC ceramic disk showed both high mean friction coefficient of 0.469 and high stability coefficient of 0.908, which are higher than the corresponding values of same P/M pads mated with typical steel disk (0.381 for COF and 0.895 for stability coefficient). Furthermore, at the highest speed tested, the wear rate of the pad mated with the ceramic disk is 0.147 cm3/MJ, far lower than that with steel mate: 0.338 cm3/MJ, showing desired properties for the high-speed train, owing to slight adhesion between ceramic disk and metal matrix of the pad.

中文翻译:

高速列车用铜基粉末冶金刹车片与C/C-SiC制动盘配合的制动性能

摘要 高速列车制动系统的改进是由于对高且稳定的摩擦系数(COF)以及高速低磨损的需求。鉴于目前用于高速列车的粉末冶金(P/M)垫配合钢盘的 COF 衰减和严重磨损,C/C-SiC 陶瓷材料因其优异的强度而被认为是制动盘的有力候选者,断裂韧性加上相对较低的密度。应阐明对不同制动速度下制动行为的基本理解,以实现最佳应用。在这项工作中,制备了 P/M 垫和 C/C-SiC 陶瓷盘,以 15、22、30、37、46、55、59、64、69 m/s 的初始制动速度(IBS)进行制动试验进行了,并分析了表面发展,摩擦和磨损行为。COF 对比 IBS 曲线呈现出基于接触斑不断形成、增长和退化的转折点的三阶段变化:下降并在 37 m/s 处达到 0.443 的低点,然后逐渐增加并达到在 55 m/s 时最大为 0.486,然后在 69 m/s 时几乎降至 0.460。在较大的制动速度范围内,P/M 刹车片与 C/C-SiC 陶瓷盘配合表现出 0.469 的高平均摩擦系数和 0.908 的高稳定性系数,高于与相同 P/M 刹车片配合的相应值。典型的钢盘(COF 为 0.381,稳定性系数为 0.895)。此外,在测试的最高速度下,与陶瓷盘配合的垫的磨损率为0.147 cm3 / MJ,远低于钢配合的磨损率:0.338 cm3 / MJ,显示出高速列车所需的性能,
更新日期:2020-05-01
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