短碳纤维增强铜基复合材料的载流摩擦磨损行为  

Friction and Wear Behaviors of Short Carbon Fibre Reinforced Copper Matrix Composites with Electric Current

作　　者：杨浩[1,2] 朱明明[1,2] 李卫[1,2] 

机构地区：[1]暨南大学材料系 [2]暨南大学耐磨材料工程研究中心

出　　处：《特种铸造及有色合金》2013年第8期765-768,共4页Special Casting & Nonferrous Alloys

基　　金：国家-广东联合基金重点项目(U1034002)

摘　　要：采用粉末冶金法制备短碳纤维体积含量分别为2.5%、5.0%、7.5%、10.0%、12.5%和15.0%的碳纤维增强铜基复合材料,在MZL-500H载流摩擦磨损试验机上进行了载流摩擦磨损特性研究。结果表明,在电流密度为0.315A/mm2、滑动速度为25m/s、载荷为30N条件下,随着碳纤维含量的增加,复合材料的摩擦因数呈现先减小再增大的趋势。经过镀铜处理的短碳纤维增加复合材料摩擦因数要低于未经过镀铜处理的复合材料。在滑动速度为25m/s、载荷为30N条件下,随着电流密度的增加,镀铜短碳纤维复合材料的摩擦因数下降而体积磨损率增加,与此同时磨损机制逐渐向着以电弧侵蚀为主转变。碳纤维含量为12.5%的复合材料摩擦因数和体积磨损率均小于镀铜碳纤维含量为5%的复合材料。Through the powder metallurgy method, the short carbon fiber reinforced copper matrix com- posites with different content of short carbon fiber were prepared including 2.5% ,5.0% ,7.5% ,10.0%, 12.5 % and 15.0 % in volumetric fraction, respectively. By means of MZL-500H friction wear testing ma- chine, the effects of the short carbon fiber volume fraction and current density on tribological properties of the composites prepared were investigated. The results show that under the conditions of the fixed current density 0. 315 A/mm2 and the fixed sliding speed 25 m/s as well as loading of 30 N, with the in- crease of carbon fiber content, the frictional coefficient of the composites is decreased firstly and then in- creased. Meanwhile, the composites prepared with copper coated short carbon fiber exhibit the more ex- cellent friction coefficient than those without the copper coated short carbon fiber. The volume wear rate of the composites prepared with copper coated short carbon fiber is decreased firstly and then increased while the volume wear rate of the composites prepared without copper coated short carbon fiber is in- creased. With loading of 30 N and sliding speed of 25 m/s, the friction coefficient of the composites is decreased while the volume wear rate is increased with the increase of the current density. In addition, wear mechanism is transformed gradually toward the arc erosion. The composites with the 12.5 % copper coated short carbon fiber exhibit the lower friction coefficient and volume wear rate than those with the 5 % copper coated short carbon fiber.

关 键 词：碳纤维增强铜基复合材料 摩擦因数 磨损 

分 类 号：TB331[一般工业技术—材料科学与工程]