第23卷第5期 2015年10月
材料科学与工艺
MATERIALS SCIENCE & TECHNOLOGY
doi:10.11951/j.issn.1005-0299.20150507
Vol. 23No.5 Oct.2015
热处理对炭/炭一铜复合材料载流磨损行为的影响
杨鹏翻，张红波，尹健，杨双磊（粉末冶金国家重点实验室（中南大学），长沙410083）
摘要：为探明炭/炭（C/C）多孔体热处理对炭/炭-铜（C/C-Cu）复合材料载流磨损行为的影响，采用化学气相渗透法(CVI)增密的C/C多孔体，再通过压力熔渗法制备C/C-Cu复合材料.采用载流动态磨损试验机测试C/C-Cu复合材料载流磨损行为，利用数字式三维视频显微镜和扫描电子显微镜观察复合材料磨损前后的表面形貌，研究了C/C多孔体经过2000C热处理对C/C-Cu复合材料载流磨损行为的影响.结果表明：C/C-Cu复合材料的质量磨损率和线磨损率比 C/C多孔体未经热处理的复合材料分别降低了34.42%和17.84%；C/C多孔体经过2000℃热处理，石墨化度提高，片层劈裂阻力减小，在载荷的作用下石墨片层易于劈裂形成细小的石墨微晶碎片，迅速填充修复表面缺陷，形成具有一定润滑作用、平整的摩擦膜，有效抑制了局部非均匀磨损的扩大，减弱了磨粒磨损和电弧放电引起的烧蚀、粘着、氧化磨损之间的循环交替磨损，载流磨损性能提高
关键词：C/C-Cu复合材料；磨损；载流；受电弓滑板；热处理
中图分类号：TB333；TH117.1
文献标志码：A
文章编号：1005-0299(2015)05-003805
Effects of heat treatment on wear behavior of carbon/carbon-copper
composites under electrical current
YANGPengao,ZHANGHongbo,YINJian,YANGShuanglei
( State Key Laboratory of Powder Metallurgy( Central South University) , Changsha 410083, China)
Abstract: To explore the effects of heat treatment of Carbon/Carbon (C/C) substrates on wear behavior of Carbon/Carbon-Copper (C/C-Cu) composites, copper-impregnated carbon fiber reinforced carbon composites were fabricated by infiltrating molten copper alloy into C/C substrates, which were made by chemical vapor infiltration (CVI). The wear behavior of C/C-Cu composites was investigated by using a dynamic wear test apparatus during application of an AC electrical current. The worm surfaces of composites before and after test were observed by 3D microscope and SEM. Effects of 2 O00℃ heat treatment of C/C substrates on wear behavior of C/C-Cu composites were investigated. The results indicate that the mass wear rate and linear wear rate of the C/C-Cu composites whose C/C substrates were treated at 2 000 C were 34.42% and 17.84%, respectively, lower than that of composites without heat treatment. The graphitization degree of C/C substrates improved after 2 000 C heat treatment, thus, the interlaminar splitting resistance was reduced. Thus it is easier for graphite sheets to split into small graphite scraps and form a smooth and lubricant film on the surface, which restrained the inhomogeneous wear induced by surface defects. Therefore, the mutual effects of abrasive wear, adhesive wear, oxidation wear and arc ablation are weakened.
Keywords: C/C-Cu composites; wear; electrical current; contact strip; heat treatment
受电弓滑板是电力机车获得动力来源的重要
收稿日期：2015-01-25.
基金项目：国家自然科学基金资助项目（51302322) 作者简介：杨鹏朝（1989一），男，硕士研究生；
张红波（1964一），男，教投
通信作者：张红波，E-mail；zhanghb@hnu.com
部件[1].列车运行过程中，受电弓滑板与接触网导线通过相对滑动摩擦传输高达1000A的工作电流，其相对滑动速率超过80m/s.强电流、高速率容易引起滑板与受电弓之间的高频冲击和离线电