碳纤维增强铜基自润滑复合材料的摩擦磨损性能研究  

Frictional Wear Properties of Carbon-fiber-reinforced Copper-based Self-lubricating Composites

作　　者：黎炳前 张福勤[1] 杨昭[2] 郑吉祥[1] 

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]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《矿冶工程》2016年第5期107-109,114,共4页Mining and Metallurgical Engineering

基　　金：国家重点基础研究发展规划资助项目(2011CB605803)

摘　　要：采用无压熔渗工艺制备了碳纤维增强铜基自润滑复合材料。采用偏光显微镜和扫描电镜观察了材料的组织形貌,研究了热解碳含量对材料物理性能的影响,并探讨了往复运动模式下材料的摩擦磨损性能及磨损机制。研究结果表明:含钛锡青铜熔融合金液体可充分渗入碳纤维多孔预制体中,复合材料成分均匀;随热解碳体积含量增加,复合材料密度、硬度及摩擦系数减小,磨损率升高;材料表面摩擦膜的形成和脱落是造成复合材料磨损加剧的原因;碳纤维增强铜基自润滑复合材料在往复运动模式下的摩擦磨损机制主要为磨粒磨损并伴随氧化磨损。Carbon-fiber-reinforced copper-based self-lubricating composites were fabricated by pressureless melt infiltration process. The microstructure and morphology of the composites were observed by polarized light microscope and scanning electron microscope. The effects of pyrocarbon content on physical properties of the composites were investigated. The frictional wear behaviors and wear mechanism of the composites under the pattern of reciprocating motion were discussed as well. The results showed that Ti-Sn-bearing bronze molten alloy well infiltrated carbon fiber preforms to form uniform and compact composites. With the increasing of pyrocarbon content,the hardness,density and friction coefficient of the composites significantly decreased,while the wear rate increased. The formation and shedding of the friction film was the main reason why wear became serious. The wear mechanism of the composite was mainly abrasive wear and oxidative wear.

关 键 词：无压熔渗 自润滑复合材料 碳纤维 磨损机制 

分 类 号：TB332[一般工业技术—材料科学与工程]