摘要
在高温高压下,通过金属浸渗法将熔融的金属铜和铝压铸到多孔碳基体中制备出C/Cu和C/Al复合材料。采用往复式摩擦试验机进行干摩擦磨损试验,研究载荷、滑动速度对复合材料磨损率的影响,通过SEM、EDS探究复合材料的磨损表面形貌和成分。结果表明:材料的磨损率随载荷和速度的增加而上升。与C/Al复合材料相比,C/Cu复合材料的摩擦系数较高但磨损体积较小。随载荷的增加,C/Cu和C/Al复合材料的摩擦系数先增后降,并在5N载荷下分别达到最大值0.228和0.206。随速度的增加,C/Al复合材料的摩擦系数先降后升,并在0.05m/s时达到最小值0.155;而C/Cu复合材料的摩擦系数变化并不明显。经过分析,复合材料的磨损机制包括磨粒磨损、粘着磨损和疲劳破坏。氧化磨损仅发生在C/Al复合材料的滑动过程中。
Carbon/copper （C/Cu） composite and carbon/aluminum （C/A1） composite were fabricated by diecasting molten copper or aluminum into porous carbon matrix at high temperature and high pressure. Dry sliding wear tests under different normal loads and sliding speeds were performed using a reciprocating friction and wear testing machine. Worn surfaces were analyzed by Scanning Electron Microscope （SEM） and Energy Dispersive Spectrometer （EDS）. Testing results show that the wear rate increases with increasing the normal load and sliding speed. Friction coefficient of C/Cu composite is higher while the wear rate is lower than that of C/A1 composite. Friction coefficients of both C/Cu and C/AI composites increases and then decrease with increasing the normal load and reaches a maximum of 0. 228 and 0. 206 at 5 N, respectively, and then descends. Friction coefficient of C/A1 composite decreases with an increase in the sliding speed and reaches a minimum of 0. 155 at 0.05 m/s, and then ascends. Whereas, C/Cu composite shows its insensitivity in the friction coefficient to the sliding speed. Wear mechanism of the composites mainly combines abrasive wear, adhesive wear and fatigue wear. However, oxidative wear occurs during the sliding process of C/A1 composite. Meanwhile, addition of copper or aluminum significantly increases the mechanical properties of composites.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2013年第6期827-834,900,共9页
Journal of Materials Science and Engineering
基金
National Natural Science Foundation of China(51341006 and 51101110)
State Key Lab of Advanced Metals and Materials(2013-Z03)
Key Laboratory of Cryogenics,TIPC,CAS(CRYO201306)
Program for Talent Introduction at Taiyuan University of Technology(tyut-rc 2011 21a)
Youth Science Foundation of Taiyuan University of Technology(2012L046)
关键词
C
CU复合材料
C
AL复合材料
摩擦
磨损
carbon/copper composite
carbon/aluminum composite
friction
wear
