WC-Al_2O_3复合材料与Si_3N_4陶瓷和YG6硬质合金配副时的摩擦磨损行为
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摘要
采用真空热压烧结技术制备了WC-15%Al_2O_3(质量分数)复合材料,分别以Si_3N_4陶瓷和YG6硬质合金为配副,在载荷40,80N下进行了干滑动摩擦磨损试验,研究了复合材料的摩擦磨损性能。结果表明:与Si_3N_4陶瓷配副时复合材料的摩擦因数较高且波动较大,与YG6硬质合金配副时摩擦因数较低且相对稳定;与Si_3N_4陶瓷配副时,复合材料的磨损率在较低载荷下高于与YG6硬质合金配副时的,在较高载荷下则低于与YG6硬质合金配副时的;在载荷40,80N下,复合材料的磨损机制均主要为疲劳磨损,伴随着微裂纹、脆性断裂和晶粒拔出等特征。
WC-15wt%Al_2O_(3 )composite was prepared by vacuum hot-press sintering technique,and then subjected to dry sliding friction and wear tests under loads of 40,80Nagainst Si_3N_4ceramics and YG6cemented carbide,respectively.The friction and wear behavior of the composite was investigated.The results show that the friction factor of the composite against Si_3N_4ceramics was relatively high and fluctuated fiercely,whereas when against YG6cemented carbide,the friction factor was relatively low and stable.The wear rate of the composite against Si_3N_4ceramics was higher than that against YG6cemented carbide at a lower load,whearas lower than that against YG6cemented carbide at a heavier load.The wear mechanism of the composite under both loads of 40Nand80Nwas mainly fatigue wear,exhibiting features of microcracking,brittle fracture and pull-out of grains.
WC-15wt%Al_2O_(3 )composite was prepared by vacuum hot-press sintering technique,and then subjected to dry sliding friction and wear tests under loads of 40,80Nagainst Si_3N_4ceramics and YG6cemented carbide,respectively.The friction and wear behavior of the composite was investigated.The results show that the friction factor of the composite against Si_3N_4ceramics was relatively high and fluctuated fiercely,whereas when against YG6cemented carbide,the friction factor was relatively low and stable.The wear rate of the composite against Si_3N_4ceramics was higher than that against YG6cemented carbide at a lower load,whearas lower than that against YG6cemented carbide at a heavier load.The wear mechanism of the composite under both loads of 40Nand80Nwas mainly fatigue wear,exhibiting features of microcracking,brittle fracture and pull-out of grains.
引文
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[2]KLAASEN H,KBARSEPP J.Wear of advanced cemented carbides for metalforming tool materials[J].Wear,2004,256(7/8):846-853.
[3]PIRSO J,LETUNOVITS,VILJUS M.Friction and wear behaviour of cemented carbides[J].Wear,2004,257(3/4):257-265.
[4]KIM H C,SHON I J,YOON J K,et al.Rapid sintering of ultrafine WC-Ni cermets[J].International Journal of Refractory Metals and Hard Materials,2006,24(6):427-431.
[5]MALEK O,LAUWERS B,PEREZ Y,et al.Processing of ultrafine ZrO2toughened WC composites[J].Journal of the European Ceramic Society,2009,29(16):3371-3378.
[6]MA J,ZHU S G,OUYANG C X.Two-step hot-pressing sintering of nanocomposite WC-MgO compacts[J].Journal of the European Ceramic Society,2011,31(10):1927-1935.
[7]QU H,ZHU S G,LI Q,et al.Microstructure and mechanical properties of hot-pressing sintered WC-xvol.%Al2O3composites[J].Materials Science and Engineering:A,2012,543:96-103.
[8]QU H X,ZHU S G,LI Q,et al.Influence of sintering temperature and holding time on the densification,phase transformation,microstructure and properties of hot pressing WC-40vol.%Al2O3 composites[J].Ceramics International,2012,38(2):1371-1380.
[9]DONG W W,ZHU S G,WANG Y,et al.Influence of VCand Cr3C2as grain growth inhibitors on WC-Al2O3composites prepared by hot press sintering[J].International Journal of Refractory Metals and Hard Materials,2014,45:223-229.
[10]SAITO H,IWABUCHI A,SHIMIZU T.Effects of Co content and WC grain size on wear of WC cemented carbide[J].Wear,2006,261(2):126-132.
[11]GONG T M,YAO P P,ZUO X T,et al.Influence of WCcarbide particle size on the microstructure and abrasive wear behavior of WC-10Co-4Cr coatings for aircraft landing gear[J].Wear,2016,362/363:135-145.
[12]BONNY K,DE BAETS P,PEREZ Y,et al.Friction and wear characteristics of WC-Co cemented carbides in dry reciprocating sliding contact[J].Wear,2010,268(11/12):1504-1517.
[13]尹斌,周惠娣,陈建敏,等.等离子喷涂纳米WC-12%Co涂层与陶瓷和不锈钢配副时的摩擦磨损性能对比研究[J].摩擦学学报,2008,28(3):213-218.
[14]骆祎岚,刘秀蕊,董威威,等.WC-Al2O3复合材料摩擦磨损性能[J].复合材料学报,2016,33(11):2584-2590.
[15]李秀林,陈丽勇,易丹青,等.WC-11Co硬质合金与不同岩石的摩擦磨损特性[J].粉末冶金材料科学与工程,2015,20(3):398-405.
[16]SHEIKH-AHMAD J Y,BAILEY J A.The wear characteristics of some cemented tungsten carbides in machining particleboard[J].Wear,1999,225/226/227/228/229:256-266.
[17]BAJWA S,RAINFORTH W M,LEE W E.Sliding wear behaviour of SiC-Al2O3nanocomposites[J].Wear,2005,259(1/2/3/4/5/6):553-561.
[18]SUH M S,CHAE Y H,KIM S S.Friction and wear behavior of structural ceramics sliding against zirconia[J].Wear,2008,264(9/10):800-806.