CeO_2和Y_2O_3对Ti-Al/WC金属陶瓷复合涂层摩擦学性能的影响
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摘要
为了改善等离子喷涂涂层表面组织结构性能差和耐磨性能低的问题,以相同质量分数的CeO_2、Y_2O_3作为涂层的添加剂,采用等离子喷涂的方式制备出不同类型的稀土涂层。利用附带有能谱仪(EDS)的扫描电镜(SEM)、X射线衍射仪(XRD)以及摩擦磨损试验机对各涂层表面形貌和组织特征以及耐磨性能进行对比和分析。结果表明:当加入稀土后,特别是同时加入CeO_2和Y_2O_3时,等离子喷涂涂层的材料堆积、孔隙等基本消失,涂层内的残余应力下降38%,且摩擦性能和耐磨性能得到明显的提高;单独加入CeO_2和Y_2O_3后涂层的磨损由严重的黏着磨损转变为黏着磨损和磨粒磨损,同时加入CeO_2和Y_2O_3后涂层仅发生磨粒磨损。
To improve the surface microstructure and wear resistance of plasma sprayed coatings,different kinds of rare earth coatings were prepared by plasma spraying with the same mass fraction of CeO_2 and Y_2O_3 as additives.Scanning electron microscopy(SEM)and X-ray diffraction(XRD)with energy dispersive spectroscopy(EDS)were used to analyze the surface morphology and microstructure of the rare earth coatings,and friction and wear tester was used to analyze the anti-wear of the coatings.The results show that when the rare earth is added,especially when CeO_2 and Y_2O_3 are added at the same time,the material accumulation and pore of plasma sprayed coatings disappear,the residual stress in the coatings is decreased by 38%,and the properties of friction reducing and anti-wear of the coatings are obviously improved.After adding CeO_2 or Y_2O_3 respectively,the wear of the coatings is changed from serious adhesive wear to adhesive wear and abrasive wear,while after adding CeO_2 and Y_2O_3 at the same time,only abrasive wear occurs on the coatings.
To improve the surface microstructure and wear resistance of plasma sprayed coatings,different kinds of rare earth coatings were prepared by plasma spraying with the same mass fraction of CeO_2 and Y_2O_3 as additives.Scanning electron microscopy(SEM)and X-ray diffraction(XRD)with energy dispersive spectroscopy(EDS)were used to analyze the surface morphology and microstructure of the rare earth coatings,and friction and wear tester was used to analyze the anti-wear of the coatings.The results show that when the rare earth is added,especially when CeO_2 and Y_2O_3 are added at the same time,the material accumulation and pore of plasma sprayed coatings disappear,the residual stress in the coatings is decreased by 38%,and the properties of friction reducing and anti-wear of the coatings are obviously improved.After adding CeO_2 or Y_2O_3 respectively,the wear of the coatings is changed from serious adhesive wear to adhesive wear and abrasive wear,while after adding CeO_2 and Y_2O_3 at the same time,only abrasive wear occurs on the coatings.
引文
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[5]曹慧,李建国,高玉贵,等.纳米CeO2对Zr O2-Y2O3陶瓷涂层耐腐蚀和结合强度的影响[J].内蒙古科技大学学报,2010,6(8):1439-1443.CAO H,LI J G,GAO Y G,et al.Effect of nanometer CeO2on wearing resistance and corrosion strength of Zr O2-Y2O3Ceramics Coatings[J].Journal of Inner Mongolia University of Science and Technology,2010,6(8):1439-1443.
[6]HSU S E,HSU I C.Study on VPS-cladding of Ni Al intermetallics on the Ti-Al-based intermetallics[J].Corrosion Science,1999,41(7):1431-1445.
[7]KULKARNI A,VAIDYA A,GOLAND A,et al.Processing effects on porosity property correlations in plasma sprayed yttria-stabilized zirconia coatings[J].Materials Science and Engineering,2003,359(1/2):100-111.
[8]ZHANG Z Y,LU X C,HAN B L,et al.Rare earth effect on the microstructure and wear resistance of Ni-based coatigs[J].Materials Science and Engineering,2007,454/455:194-202.
[9]ZHANG Z Y,LU X C,LUO J B.Tribological properties of rare earth oxide added Cr3C2-Ni Cr coatings[J].Applied Surface Science,2007,253(9):4377-4385.
[10]高才桥.金属的摩擦磨损及其热处理[M].北京:机械工业出版社,1985.
[11]KUMAR C N S,BAURI R.Enhancing the phase stability and ionic conductivity of seandia stabilized zirconia by rage earth CO-doping[J].Journal of Physics&Chemistry of Solids,2014,75(5):642-650.
[12]ZHU D M,CHEN Y L,MILLER R A.Defect clustering and nano-phase structure characterization of multi-component rare earth oxide doped zireonia-yttria thermal barrier coatings[M]//KRIVEN W M,LIN H T.27th Annual Cocoa Beach Conference on Advanced Ceramics and Composites:Ceramic Engineering and Science Proceedings.Westerville,OH:The American Ceramic Society,2003.
[13]KAN Y,LI S,WANG P,et al.Preparation and conductivity of Yb2O3-Y2O3and Gd2O3-Y2O3co-doped zirconia ceramics[J].Solid State Ionics,Diffusion&Reactions,2008,179:1531-1534.
[14]ANON.Measuring casting residual stress with X-ray diffraction[J].Modern Casting,2005,95(2):48-49.
[15]高万振,刘佐民,高新蕾,等.表面耐磨损与摩擦学材料设计[M].北京:化学工业出版社,2014.