炭陶配副用碳纤维增强铜基摩擦材料及其摩擦学行为  

Tribological behavior of carbon fiber reinforced copper-based friction material mated with C/C-SiC

作　　者：陈琦 徐宇轩 周海滨 周佩禹 邓敏文[1] 韩勇[1] 姚萍屏[1] CHEN Qi;XU Yuxuan;ZHOU Haibin;ZHOU Peiyu;DENG Minwen;HAN Yong;YAO Pingping(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China;Hunan Province Key Laboratory of Materials Surface/Interface Science&Technology,Central South University of Forestry&Technology,Changsha 410004,China)

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083 [2]中南林业科技大学材料表界面科学与技术湖南省重点实验室,湖南长沙410004

出　　处：《中南大学学报（自然科学版）》2024年第8期3105-3119,共15页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(52175209,52205243);湖南省自然科学基金资助项目(2023JJ057);中南大学粉末冶金重点实验室开放基金资助项目(Sklpm-KF-07)。

摘　　要：炭陶配副用铜基摩擦材料在高速制动下难以兼具高摩擦因数与高耐磨性,为此,采用粉末冶金法制备短切沥青基碳纤维增强铜基摩擦材料,对材料力学、热学与摩擦学性能进行研究。研究结果表明:在室温下,碳纤维增强铜基摩擦材料布氏硬度提升14.8%,热扩散系数提高9.5%,比热容提升6.8%;在高速制动条件下(6000 r/min),碳纤维增强铜基摩擦材料摩擦耐磨性能显著提升,摩擦因数提升25.0%,稳定系数提升6.1%,且磨损量降低42.2%;加入碳纤维能显著提高表面平整度,增加机械混合层的厚度,降低磨屑直径,提高摩擦材料耐磨性;碳纤维增强铜基摩擦材料随速度增加发生从磨粒磨损、黏着磨损到氧化磨损、疲劳磨损的转变。It is difficult for copper-based friction materials(CFM)to exhibit both high coefficient of friction and exceptional wear resistance when mated with C/C-SiC composites under high-speed braking conditions.In this research,copper-based friction materials reinforced with short-cutting pitch-based carbon fibers(CFM-CF)were prepared by powder metallurgy,and the mechanical,thermal and tribological properties of CFM-CF were investigated.The results show that at room temperature,the Brinell hardness,thermal diffusion coefficient and specific heat capacity of CFM-CF increase by 14.8%,9.5%and 6.8%,respectively.Under high-speed braking condition(6000 r/min),the friction coefficient and stability coefficient of CFM-CF increase by 25.0%and 6.1%,respectively,and the wear loss decreases by 42.2%.The improved flatness of worn surface and formation of stable mechanical mixing layer as well as the dropped diameter of wear debris contribute to the superior wear resistance of CFM-CF.The wear mechanism of CFM-CF changes from abrasive wear and adhesive wear to oxidation wear and fatigue wear with the increase of speed.

关 键 词：铜基摩擦材料 碳纤维 磨损机制 摩擦学行为 

分 类 号：TF125[冶金工程—粉末冶金]