采用EB-PVD非连续沉积工艺制备了微叠层结构热障涂层,对涂层结构和晶体形貌进行了SEM观察和分析,采用激光脉冲法测定了涂层的热扩散系数,并采用增重法研究了涂层的氧化动力学特征,分析了氧化后的元素扩散情况.结果表明,非连续EB-PVD沉积工艺制备的涂层具有明显的层状特征,常规EB-PVD热障涂层的柱状晶结构被周期性地打破;但在每一层中,柱状晶结构得以保留,且晶粒更加细化.微叠层热障涂层的热扩散系数比常规热障涂层降低20%～30%,涂层热扩散系数的降低主要与层间界面和晶粒的细化减小了声子的平均自由程有关.微叠层结构热障涂层的氧化增重速率明显低于常规试样,遵循典型的抛物线规律,垂直于元素扩散方向的层间界面和细晶更有效地降低或阻止了O、Al、Ni、Cr等元素的扩散,可能是氧化增重速率较低的主要原因.
参考文献
| [1] | Uwe Schulz;Christoph Leyens;Klaus Fritscher;Manfred Peters;Bilge Saruhan-Brings;Odile Lavigne;Jean-Marc Dorvaux;Martine Poulain;Remy Mevrel;Michaeel Caliez .Some recent trends in research and technology of advanced thermal barrier coatings[J].Aerospace science and technology,2003(1):73-80. |
| [2] | 牟仁德,何利民,陆峰,陶春虎.热障涂层制备技术研究进展[J].机械工程材料,2007(05):1-4. |
| [3] | 周洪,李飞,何博,陆燕玲,王俊,孙宝德.等离子喷涂热障涂层的隔热性分析[J].中国有色金属学报,2007(10):1609-1615. |
| [4] | Azzopardi A.;Mevrel R.;Saint-Ramond B.;Olson E.;Stiller K. .Influence of aging on structure and thermal conductivity of Y-PSZ and Y-FSZ EB-PVD coatings[J].Surface & Coatings Technology,2004(0):131-139. |
| [5] | Singh J.;Wolfe DE. .Architecture of thermal barrier coatings produced by electron beam-physical vapor deposition (EB-PVD)[J].Journal of Materials Science,2002(15):3261-3267. |
| [6] | Singh J.;Wolfe DE.;Miller RA.;Eldridge JI.;Zhu DM. .Tailored microstructure of zirconia and hafnia-based thermal barrier coatings with low thermal conductivity and high hemispherical reflectance by EB-PVD[J].Journal of Materials Science,2004(6):1975-1985. |
| [7] | Nicholls JR.;Lawson KJ.;Johnstone A.;Rickerby DS. .Methods to reduce the thermal conductivity of EB-PVD TBCs[J].Surface & Coatings Technology,2002(0):383-391. |
| [8] | Mineaki Matsumoto;Norio Yamaguchi;Hideaki Matsubara .Low thermal conductivity and high temperature stability of ZrO_2-Y_2O_3-La_2O_3 coatings produced by electron beam PVD[J].Scripta materialia,2004(6):867-871. |
| [9] | R. E. Taylor;X. Wang;X. Xu .Thermophysical properties of thermal barrier coatings[J].Surface & Coatings Technology,1999(0):89-95. |
| [10] | W. Beele;G. Marijnissen;A. van Lieshout .The evolution of thermal barrier coatings -- status and upcoming solutions for today's key issues[J].Surface & Coatings Technology,1999(0):61-67. |
| [11] | ZHU D;MILLER R A.Development of Advanced low conductivity thermal barrier coatings[J].Surface and Coatings Technology,1998(108-109):114-120. |
| [12] | WIRTMAN D .Multilayer thermal barrier coating[P].U.S.patent 5942334,1999-8-24. |
| [13] | SIEGEL R .Green's Function to determine temperature distribution in a semitransparent thermal barrier coating[J].Journal of Thermophysics and Heat Transfer,1997,11(02):315-318. |
| [14] | PARKER W J;JENKINS R J;BUTLER C P et al.Thermal diffusivity measurement using the flash technique[J].Journal of Applied Physics,1961,32(09):1679-1684. |
| [15] | H. Wang;R. B. Dinwiddie .Reliability of laser flash thermal diffusivity measurements of the thermal barrier coatings[J].Journal of Thermal Spray Technology,2000(2):210-214. |
| [16] | 杨世铭;陶文铨.传热学[M].北京:高等教育出版社,1998:50. |
| [17] | CLARKE David R.Materials selection guidelines for low thermal conductivity thermal barrier coatings[J].Surface and Coatings Technology,2003(163-164):67-73. |
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