摘要
目的探究真空热处理对PS-PVD制备的粘结层的影响,并研究PS-PVD制备粘结层对热障涂层性能的影响。方法采用PS-PVD技术在高温合金基体上制备不同材料体系的粘结层和陶瓷层,采用真空热处理和高温氧化试验,对粘结层与基体界面间的元素扩散过程以及不同材料粘结层对热障涂层抗氧化性能的影响进行研究,并通过X射线衍射和EDS能谱对涂层的物相及元素分布进行分析。结果通过PS-PVD制备的不同粘结层体系的热障涂层试样,在近粘结层处的陶瓷层物相组成并无明显区别。粘结层与基体的元素扩散情况受真空热处理时间和温度的影响,随着真空热处理时间的延长,基体一侧的富铝相逐渐增多。当热处理8 h后,形成的扩散区的宽度已超过20μm;随着热处理温度的提高,同样也形成了更宽的扩散区。NiCoCrAlYTa/7YSZ热障涂层氧化100 h后,TGO层的厚度达到4.0μm,氧化150 h时,涂层发生脱离。NiCrAlY/7YSZ热障涂层氧化150 h后,TGO层的厚度达到4.4μm,但未出现脱离现象。结论热处理的时间越长,温度越高,粘结层与基体的元素扩散行为越剧烈。不同的粘结层材料会影响热障涂层的氧化动力学过程。
The paper aims to investigate the effect of vacuum heat treatment on the bond coating prepared by PS-PVD,and the effect of the bond coating prepared by PS-PVD on the performance of thermal barrier coating.Bond coatings and ceramic coatings of different material systems were deposited on the high-temperature alloy substrate by PS-PVD technology.And the vacuum heat treatment experiment and high temperature oxidation test were conducted to analyze the bond coating/substrate interface elements diffusion behavior and the effect of different bond coatings on oxidation resistance of thermal barrier coating,respectively.The phase compositions and elements distribution of the coating were characterized by X-ray diffraction and EDS analysis.There was no significant difference in the phase composition of the ceramic layer near the bond coating of the obtained thermal barrier coatings with different bond coating.The elements diffusion of the bond coating and the substrate was affected by the vacuum heat treatment time and temperature.With the extension of the vacuum heat treatment time,the aluminum-rich phase of near the substrate gradually increased.The width of the diffusion zone exceeded 20μm after heat treatment of 8 h.And as the heat treatment temperature increased,a wider diffusion zone also formed.For NiCoCrAlYTa/7YSZ thermal barrier coating,the TGO thickness reached 4.0μm after 100 h of oxidation and the coating detached after oxidation of 150 h.While for the NiCrAlY/7YSZ thermal barrier coating,the thickness of the TGO layer was 4.4μm and no detachment was detected after 150 h of oxidation.The longer the heat treatment time,the higher the temperature,the more intense the elements diffusion behavior of the bond coating and the matrix.Different bond coatings materials can affect the oxidation kinetics of the thermal barrier coatings.
作者
张啸
刘敏
毛杰
刘飞
邓子谦
邓春明
郑黎
ZHANG Xiao;LIU Min;MAO Jie;LIU Fei;DENG Zi-qian;DENG Chun-ming;ZHENG Li(Key Lab of Guangdong for Modern Surface Engineering Technology,National Engineering Laboratory for Modern Materials Surface Engineering Technology,Guangdong Institute of New Materials,Guangzhou 510650,China;School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2020年第6期236-243,共8页
Surface Technology
基金
国家重点研究计划(2017YFB0306100)
国家科技重大专项(2017-VI-0010-0081)
广东省重点领域计划(2019B010936001)
广东省科技计划项目(2017A070701027,2014B070705007)
广东省科学院项目(2019GDASYL-0104022)。
关键词
PS-PVD热障涂层
粘结层
真空热处理
元素扩散
氧化动力学
PS-PVD thermal barrier coatings
bond coatings
vacuum heat treatment
elemental diffusion
oxidation kinetics
