银-石墨烯复合材料的滑动摩擦磨损性能
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摘要
采用球磨混粉、冷等静压和真空烧结的工艺流程制备了含0.5%～2.0%石墨烯的银-石墨烯复合材料,并对复合材料进行销盘式摩擦磨损试验以研究其大气环境滑动摩擦磨损性能。研究结果表明,因石墨烯易团聚,石墨烯含量限于1.5%时能够有效改善复合材料的性能。与未增强的银相比,由于在接触表面形成自润滑碳质膜,银-石墨烯复合材料表现出较低的摩擦系数、较少的磨损量和较低的接触表面温度。随石墨烯含量的增加,复合材料的摩擦系数和磨损量均下降。复合材料的主要磨损机制为粘着磨损和磨料磨损。
Ag-graphene composites with 0.5% to 2.0% of graphene were fabricated by ball milling, cold isostatic pressing and vacuum sintering. Their sliding friction and wear properties were tested in a pin-on-disc under sliding contact in air. The results indicated that the graphene content was limited to1.5%due to its the agglomeration properties, and that the composite had the best performance. The composites exhibited lower coefficient of friction, less wear loss and lower surface friction temperature compared to unreinforced silver due to the formation of a self-lubricating carbonaceous film on the contact surface. The friction coefficient and the wear loss of the composites decrease with increase in graphene content. The main wear mechanisms of the composites are adhesive wear and abrasive wear.
Ag-graphene composites with 0.5% to 2.0% of graphene were fabricated by ball milling, cold isostatic pressing and vacuum sintering. Their sliding friction and wear properties were tested in a pin-on-disc under sliding contact in air. The results indicated that the graphene content was limited to1.5%due to its the agglomeration properties, and that the composite had the best performance. The composites exhibited lower coefficient of friction, less wear loss and lower surface friction temperature compared to unreinforced silver due to the formation of a self-lubricating carbonaceous film on the contact surface. The friction coefficient and the wear loss of the composites decrease with increase in graphene content. The main wear mechanisms of the composites are adhesive wear and abrasive wear.
引文
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[4]WANG J,FENG Y,LI S,et al.Influence of graphite content on sliding wear characteristics of CNTs-Ag-Gelectrical contact materials[J].The chinese journal of nonferrous metals,2009,19:113-118.
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[6]蒋鹏,王亚平,丁秉钧.碳素形态对Ag/C触头材料组织及性能的影响[J].兵器材料科学与工程,2003,26(3):28-30.JIANG P,WANG Y P,DING B J.Effect of carbon type on microstructures and properties of Ag/C contact alloys[J].Ordnance material science and engineering,2004,28(1):1-4.
[7]王松,王塞北,李爱坤,等.不同碳质相增强银基复合材料的电接触行为[J].贵金属,2018,39(4):39-45.WANG S,WANG S B,LI A K,et al.Electrical contact behaviors of silver-based composites reinforced with different carbonaceous phases[J].Precious metals,2018,39(3):63-70.
[8]JIANG P,LI F,WANG Y P,et al.Effect of different types of carbon on microstructure and arcing behavior of Ag/Ccontact materials[J].IEEE transactions on components and packaging technologies,2006,29(2):420-423.
[9]王松,谢明,李爱坤,等.新型Ag-CNTs电接触材料的制备及其性能[J].有色金属科学与工程,2015,6(5):40-44.WANG S,XIE M,LI A K,et al.Preparation and performance of a new type of Ag-CNTs electrical contact material[J].Nonferrous metals science and engineering,2015,6(5):40-44.
[10]李爱坤,谢明,王松,等.碳纳米管含量对MWCNTs/Ag复合材料组织和力学性能的影响[J].中国有色金属学报,2016,26(10):2102-2109.LI A K,XIE M,WANG S,et al.Effect of MWCNTs content on microstructure and mechanical properties of MWCNTs/Ag composites[J].The chinese journal of nonferrous metals,2016,26(10):2102-2109.
[11]TJONGS C.Recent progress in the development and properties of novel metal matrix nanocomposites reinforced with carbon nanotubes and grapheme nanosheets[J].Materials science and engineering R:Report,2013,74(10):281-350.
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[13]KIM W J,LEE T J,HAN S H.Multi-layer graphene/copper composites:preparation using high-ratio differential speed rolling,microstructure and mechanical properties[J].Carbon,2014,69:55-65.
[14]LI J H,ZHANG X Z,GENG L.Improving graphene distribution and mechanical properties of GNP/Al composites by cold drawing[J].Materials&design,2018,144:159-168.
[15]MU X N,CAI H N,ZHANG H M,et al.Interface evolution and superior tensile properties of multi-layer graphene reinforced pure Ti matrix composite[J].Materials&design,2018,140:431-441.
[16]李多生,吴文政,QIN QING-HUA,等.石墨烯/Al复合材料的微观结构及力学性能[J].中国有色金属学报,2015,25(6):1498-1504.LI D S,WU W Z,QIN Q H,et al.Microstructure and mechanical properties of graphene/Al composites[J].The Chinese journal of nonferrous metals,2015,25(6):1498-1504.
[17]WANG S,WANG S B,XIE M,et al.Effect of graphene content on microstructure and properties of multilayer graphene/silver composite[J].Precious metals,2016,37(2):51-56.
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[20]RAJKUMAR K,ARAVINDAN S.Tribological studies on microwave sintered copper-carbon nanotube composites[J].Wear,2011,270:613-621.