溶胶浸渗处理对EB-PVD制备的YSZ电解质涂层的影响
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摘要
为探索溶胶浸渗处理对电子束物理气相沉积(EB-PVD)制备8%摩尔比的氧化钇稳定氧化锆(8YSZ)涂层微观结构及性能的影响,采用EB-PVD工艺在沉积速率1μm/min的条件下制备了8YSZ电解质涂层.制备态涂层的断面表现为疏松的柱状晶结构,导致涂层的气密性差,因此对涂层进行了溶胶浸渗处理,即首先在负压下将涂层浸渗在钇锆的溶胶内,再进行550℃保温2 h的热处理.SEM分析表明,溶胶分解产物可以堵塞柱状晶间的孔隙,其渗入涂层的深度可达3μm.浸渗处理后,涂层的气体扩散系数由未处理态的6.78×10-5cm4/(N.s)降低至8次浸渗处理后的6.54×10-6cm4/(N.s).8次溶胶浸渗处理后涂层的电导率相比处理前提高不超过10%.
To explore the effects of sol infiltration treatment on YSZ electrolyte coatings prepared by electron beam physical vapor deposition(EB-PVD),8YSZ electrolyte coatings were prepared by EB-PVD at a deposition rate of 1 μm/min.Cross-sectional SEM analysis showed that the as-deposited coatings exhibited a loose columnar structure resulting in bad gas tightness.So a sol infiltration treatment was performed by immersing EB-PVD coatings in a zirconium and yttrium sol followed by a heat treatment.SEM analysis demonstrated that the sol could permeate the coatings with an impregnation depth of 3 μm.The intergranular pores and gaps of as-deposited coatings had been stuffed by decomposed products from sol.After infiltration treatment,the coefficient of gas permeability dropped from 6.78×10-5 cm4/(N·s)for as-deposited coating to 6.54×10-6 cm4/(N·s)for the coating after 8 times of infiltration treatment.However,the electrical conductivity of YSZ coating even after 8 times of sol infiltration treatment increased no more than 10% compared to that of as-deposited coating.
To explore the effects of sol infiltration treatment on YSZ electrolyte coatings prepared by electron beam physical vapor deposition(EB-PVD),8YSZ electrolyte coatings were prepared by EB-PVD at a deposition rate of 1 μm/min.Cross-sectional SEM analysis showed that the as-deposited coatings exhibited a loose columnar structure resulting in bad gas tightness.So a sol infiltration treatment was performed by immersing EB-PVD coatings in a zirconium and yttrium sol followed by a heat treatment.SEM analysis demonstrated that the sol could permeate the coatings with an impregnation depth of 3 μm.The intergranular pores and gaps of as-deposited coatings had been stuffed by decomposed products from sol.After infiltration treatment,the coefficient of gas permeability dropped from 6.78×10-5 cm4/(N·s)for as-deposited coating to 6.54×10-6 cm4/(N·s)for the coating after 8 times of infiltration treatment.However,the electrical conductivity of YSZ coating even after 8 times of sol infiltration treatment increased no more than 10% compared to that of as-deposited coating.
引文
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[2]付长璟,张乃庆,孙克宁,等.SOFC合金连接体材料的研究进展[J].材料科学与工艺,2005,13(2):123-126.FU Chang-jing,ZHANG Nai-qing,SUN Ke-ning,et al.Progress of metallic interconnect materials used forSOFC[J].Materials Science and Technology,2005,13(2):123-126.
[3]贾莉,吕喆,黄喜强,等.用于燃料电池的氧化锆薄膜制备方法进展[J].电源技术,2004,28(7):449-451.JIA Li,LZhe,HUANG Xi-qiang,et al.Progress onmanufacturing of zirconia film for fuel cells[J].Chi-nese Journal of Power Sources,2004,28(7):449-451.
[4]LAUKAITIS G,DUDONIS J,MIˇL CIUS D.YSZ Thinfilms deposited by E-Beam technique[J].Thin SolidFilms,2006,515:678-682.
[5]MOVCHAN B A,YAKOVCHUK K Y.Graded thermalbarrier coatings,deposited by EB-PVD[J].Surface&Coatings Technology,2004,188-189:85-92.
[6]孟彬,孙跃,赫晓东,等.EB-PVD制备YSZ涂层的氧空位和晶体学织构表征[J].材料科学与工艺,2007,15(6):770-773.MENG Bin,SUN Yue,HE Xiao-dong,et al.Oxygen va-cancy and crystallographic texture characterization ofYSZ coating prepared by EB-PVD[J].Materials Sci-ence and Technology,2007,15(6):770-773.
[7]SCHULZ U,SCHMCKER M.Microstructure of ZrO2thermal barrier coatings applied by EB-PVD[J].Mate-rials Science and Engineering A,2000,276:1-8.
[8]AHMANIEMI S,VUORISTO P,MNTYLT.Improvedsealing treatment for thick thermal barrier coatings[J].Surface and Coatings Technology,2002,151-152:412-417.
[9]SARAF L,MATSON D W,SHUTTHANANDAN V,etal.Ceria incorporation into YSZ columnar nanostruc-tures[J].Electrochemical and Solid-State Letters,2005,8(10):525-527.
[10]张勤俭,张建华,李敏,等.溶胶-凝胶法制备Al2O3-ZrO2陶瓷薄膜早期干燥过程的研究[J].硅酸盐学报,2002,30:128-130.ZHANG Qin-jian,ZHANG Jian-hua,LI Min,et al.Study on the initial drying process of Al2O3-ZrO2ceramic film prepared by sol-gel method[J].Journalof the Chinese Ceramic Society,2002,30:128-130.
[11]LI C J,NING X J,LI C X.Effect of densificationprocesses on the properties of plasma-sprayed YSZ e-lectrolyte coatings for solid oxide fuel cells[J].Sur-face&Coatings Technology,2005,190:60-64.
[12]LI C J,LI C X,NING X J.Performance of YSZ elec-trolyte layer deposited by atmospheric plasma sprayingfor cermet-supported tubular SOFC[J].Vacuum,2004,73:699-703.
[13]IVERS-TIFFEE E,WEBER A,HERBSTRITT D.Ma-terials and technologies for SOFC-components[J].Journal of the European Ceramic Society,2001,21:1805-1807.
[14]XING Y Z,LI C J,LI C X,et al.Influence of through-lamella grain growth on ionic conductivity of plasma-sprayed yttria-stabilized zirconia as an electrolyte insolid oxide fuel cells[J].Journal of Power Sources,2008,176:31-35.
[15]KATO T,MATSUMOTO K,MATSUBARA H,et al.Transmission electron microscopy characterization ofa yttria-stabilized zirconia coating fabricated by elec-tron beam-physical vapor deposition[J].Surface&Coatings Technology,2005,194:16-23.
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