粘结层预处理对PS-PVD沉积7YSZ热障涂层氧化行为的影响
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摘要
目的提高PS-PVD沉积7YSZ热障涂层的抗高温氧化性能。方法采用等离子喷涂-物理气相沉积(PS-PVD)分别在未预处理和预处理(抛光+预氧化)的粘结层表面制备了柱状结构7YSZ热障涂层,并在大气环境下测试了柱状结构7YSZ热障涂层的950℃静态高温氧化性能。利用扫描电子显微镜、X射线衍射仪、能谱仪对高温氧化过程中的陶瓷层/粘结层界面形貌、TGO层结构演变进行表征。结果粘结层的抛光处理能够降低表面几何受力不均匀部位,抑制陶瓷层/TGO/粘结层界面处微裂纹的产生,同时粘结层的预氧化处理形成的薄而连续的TGO层能有效降低TGO的生长速度,抑制陶瓷层-粘结层之间的元素互扩散。柱状结构7YSZ涂层的高温氧化动力学曲线符合Wagner抛物线规律,粘结层未预处理和预处理的7YSZ热障涂层的氧化速率常数分别为0.101×10~(-12) cm~2/s和0.115×10~(-13) cm~2/s。结论粘结层预处理能有效改善等离子物理气相沉积7YSZ热障涂层的抗氧化性能。
The work aims to improve resistance to high temperature oxidation of 7YSZ thermal barrier coating deposited by plasma spray-physical vapor deposition.The columnar structure 7YSZ thermal barrier coatings(TBCs) were prepared by plasma spray-physical vapor deposition(PS-PVD) on pretreated(polishing+pre-oxidation) and un-pretreated bond coat surfaces,respectively.The static resistance to high temperature oxidation of 7YSZ thermal barrier coatings was tested in atmospheric environment at 950 ℃.Interfacial morphology of the ceramic layer/bond coat as well as structure evolution of TGO layer during high-temperature oxidation process were characterized by virtue of scanning electron microscope(SEM),X-ray diffractometer and(XRD) and energy dispersive spectrometer(EDS).Polishing of bond coats could reduce parts subject to non-uniform geometric stress and inhibit the formation of micro-crack at the interface of ceramic layer/TGO/bond coats.Meanwhile,the thin and continuous TGO layer formed as a result of pre-oxidation treatment of bond coats could effectively reduce the growth rate of TGO and inhibit the element interdiffusion between ceramic layer and bond coats.The isothermal oxidation kinetic curve of columnar 7YSZ thermal barrier coatings conformed to Wagner parabolic law.The oxidation rate constant of 7YSZ coatings with bond coats pretreated and un-pretreated was 0.101×10-12 cm~2/s and 0.115×10-13 cm~2/s,respectively.The pretreated of bond coats can effectively improve the oxidation resistance of 7YSZ thermal barrier coating deposited by plasma spray-physical vapor deposition.
The work aims to improve resistance to high temperature oxidation of 7YSZ thermal barrier coating deposited by plasma spray-physical vapor deposition.The columnar structure 7YSZ thermal barrier coatings(TBCs) were prepared by plasma spray-physical vapor deposition(PS-PVD) on pretreated(polishing+pre-oxidation) and un-pretreated bond coat surfaces,respectively.The static resistance to high temperature oxidation of 7YSZ thermal barrier coatings was tested in atmospheric environment at 950 ℃.Interfacial morphology of the ceramic layer/bond coat as well as structure evolution of TGO layer during high-temperature oxidation process were characterized by virtue of scanning electron microscope(SEM),X-ray diffractometer and(XRD) and energy dispersive spectrometer(EDS).Polishing of bond coats could reduce parts subject to non-uniform geometric stress and inhibit the formation of micro-crack at the interface of ceramic layer/TGO/bond coats.Meanwhile,the thin and continuous TGO layer formed as a result of pre-oxidation treatment of bond coats could effectively reduce the growth rate of TGO and inhibit the element interdiffusion between ceramic layer and bond coats.The isothermal oxidation kinetic curve of columnar 7YSZ thermal barrier coatings conformed to Wagner parabolic law.The oxidation rate constant of 7YSZ coatings with bond coats pretreated and un-pretreated was 0.101×10-12 cm~2/s and 0.115×10-13 cm~2/s,respectively.The pretreated of bond coats can effectively improve the oxidation resistance of 7YSZ thermal barrier coating deposited by plasma spray-physical vapor deposition.
引文
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[20]华佳捷,张丽鹏,刘紫微,等.热障涂层失效机理研究进展[J].无机材料学报,2012,27(7):680—686.HUA Jia-jie,ZHANG Li-peng,LIU Zi-wei,et al.Progress of Research on the Failure Mechanism of Thermal Barrier Coatings[J].Journal of Inorganic Materials,2012,27(7):680—686.
[21]耿瑞.热障涂层强度分析及寿命预测研究[D].北京:北京航空航天大学,2001.GENG Rui.Thermal Barrier Coatings Strength Analysis and Life Prediction[D].Beijing:Beihang University,2001.
[2]朱晨,于建海,郭亚飞,等.航空发动机热障涂层存在的问题及其发展方向[J].表面技术,2016,45(1):13—19.ZHU Chen,YU Jian-hai,GUO Ya-fei,et al.Problems of Aircraft Engine Thermal Barrier Coating and Its Developing Direction[J].Surface Technology,2016,45(1):13—19.
[3]杨丽,谭明,周文峰,等.航空发动机涡轮叶片热障涂层冲蚀试验装置的研制[J].装备环境工程,2016,13(3):48—56.YANG Li,TAN Ming,ZHOU Wen-feng,et al.Development of Erosion Equipment for Turbine Blade with Thermal Barrier Coatings in Aeroengine[j].Equipment Environmental Engineering,2016,13(3):48—56.
[4]GUO H B,GONG S K,XU H B.Progress in Thermal Barrier Coatings for Advanced Aero-Engines[j].Materials China,2009,28(9/10):18—27.
[5]STRANGEMAN T,RAYBOULD D,JAMEEL A,et al.Damage Mechanisms,Life Prediction,and Development of EB-PVD Thermal Barrier Coatings for Turbine Airfoils[j].Surf Coat Technol,2007,202(4—7):658—664.
[6]牟仁德,王占考,陆峰,等.力学载荷条件下EB-PVD热障涂层损伤行为研究[J].装备环境工程,2016,13(3):63—69.MU Ren-de,WANG Zhan-kao,LU Feng,et al.Damage Behavior of Thermal Barrier Coatings Prepared by EB-PVD under Mechanical Load[j].Equipment Environmental Engineering,2016,13(3):63—69.
[7]STOVER D,HATHIRAMANI D,VABEN R,et al.Plasma Sprayed Components for SOFC Applications[J].Surf Coat Technol,2006,201(5):2002—2005.
[8]REFKE A,GINDRAT M,VON K.LPPS Thin Film:A Hybrid Coating Technology between Thermal Spray and PVD for Functional Thin Coatings and Large Area Applications[c]//Proceedings of the International Thermal Spray Conf.Beijing:[s.n.],2007:705—710.
[9]HALL A,DAI J,XIAO T.Low Pressure Plasma Spray Thin Film at San-Dia National Laboratories[c]//Proceedings of the International Spray conference.Las Vegas:[s.n.],2009:725—728.
[10]NIESSEN K V,GINDRAT M,REFLE A.Vapor Phase Deposition Using Plasma Spray-PVD[J].Journal Thermal Spray Technol,2010,19(1/2):502—509.
[11]HOSPACH A,MAUER G,VABEN R,et al.Columnar-Structured Thermal Barrier Coatings(TBCs)by Thin Film Low-pressure Plasma Spraying(LPPS-TF)[J].Journal Thermal Spray Technol,2010,20(1/2):116—120.
[12]SHINOZAWA A,EGUCHI K,KAMBARA M,et al.Feather-like Structured YSZ Coatings at Fast Rates by Plasma Spray Physical Vapor Deposition[J].Journal Thermal Spray Technol,2010,19(1/2):190—197.
[13]HARDER B.PS-PVD Processing Varies Coating Architecture with Processing Parameter[J].Advanced Material&Processes,2011,51:9—11.
[14]MAUER G,VABEN R.Plasma Sprayed-PVD:Plasma Characteristic and Impact on Coating Properties[J].Journal Physicals:Conference Series,2012,406:012005.
[15]SCHWARZER J,LOHE D,VOHRINGER O.Influence of the TGO Creep Behavior on Delamination Stress Development in Thermal Barrier Coating Systems[J].Materials Science and Engineering A,2004,387—389:692—695.
[16]GAO L H,GUO H B,WEI L L,et al.Microstructure,Thermal Conductivity and Thermal Cycling Behavior of Thermal Barrier Coatings Prepared by Plasma Spray Physical Vapor Deposition[j].Surf Coat Technol,2015,276:424—430.
[17]陈文龙,刘敏,张吉阜,等.等离子喷涂-物理气相沉积7YSZ热障涂层的高温氧化行为[J].中国表面工程,2015,28(5):49—56.CHEN Wen-long,LIU Min,ZHANG Ji-fu,et al.High Temperature Oxidation Behavior of 7YSZ Thermal Barrier Coatings Prepared by Plasma Spray-Physical Vapor Deposition[J].China Surface Engineering,2015,28(5):49—56.
[18]GAO L H,GUO H B,WEI L L,et al.Microstructure and Mechanical Properties of Yttria Stabilized Zirconia Coatings Prepared by Plasma Spray Physical Vapor Deposition[J].Ceramics International,2015,41:8305—8311.
[19]FLORES R A,SARUHAN B,SCHULZ U,et al.Effect of Morphology on Thermal Conductivity of EB-PVD PYSZ TBCs[J].Surf Coat Technol,2006,201:2611—2620.
[20]华佳捷,张丽鹏,刘紫微,等.热障涂层失效机理研究进展[J].无机材料学报,2012,27(7):680—686.HUA Jia-jie,ZHANG Li-peng,LIU Zi-wei,et al.Progress of Research on the Failure Mechanism of Thermal Barrier Coatings[J].Journal of Inorganic Materials,2012,27(7):680—686.
[21]耿瑞.热障涂层强度分析及寿命预测研究[D].北京:北京航空航天大学,2001.GENG Rui.Thermal Barrier Coatings Strength Analysis and Life Prediction[D].Beijing:Beihang University,2001.