EB-PVD热障涂层高温氧化过程中的显微结构和相分析

中国腐蚀与防护学报

2002, Vol. 22

Issue (2): 105-110

研究报告

本期目录 | 过刊浏览

EB-PVD热障涂层高温氧化过程中的显微结构和相分析

李美桓;孙晓峰;宫声凯;张重远;管恒荣;胡望宇;胡壮麒

中国科学院金属研究所

STUDIES OF MICROSTRUCTURE AND PHASE OF EB-PVDTBCs EXPOSED TO ELEVATED TEMPERATURES

Meiheng Li;Xiaofeng Sun;Shengkai Gong;Zhongyuan Zhang;Hengrong Guan;Wangyu Hu;Zhuangqi Hu

中国科学院金属研究所

全文: PDF(314 KB)

摘要: 采用磁控溅射方法在镍基单晶高温合金基体上沉积NiCrAlY 粘结层，电子束物理气相沉积方法(EB-PVD)沉积陶瓷层(7 mass%Y2O3-ZrO2).用X-射线衍射(XRD)、扫描电镜(SEM)等研究了EB-PVD热障涂层热循环过程中的相变，同时观察了样品的形貌变化.结果表明，EB-PVD方法沉积的陶瓷层，其柱状晶粒簇拥成团，表面比较致密，然而晶粒簇间存在间隙，允许柱状晶横向伸缩，使基体能在相对大的范围内自由膨胀.经高温氧化后，陶瓷层表面变得疏松，柱状晶粒簇间距增大，随着热循环的继续进行，相邻较大的间隙互相连接而形成微裂纹，并逐渐横向及纵向扩展.循环氧化比恒温氧化更易于产生显微裂纹.1050℃热循环过程中，ZrO2正方相的c/a轴比值逐渐增加，Y2O3含量逐渐减少，非平衡正方相逐渐分解成平衡正方相和立方相.循环300次后，观察到少量从平衡正方相转变而来的单斜相.

关键词 ：电子束物理气相沉积, 热障涂层, 显微裂纹, 相

Abstract：A NiCrAlY bond coat had been deposited on a Ni- base single crystal superalloy by magnetron sputtering,and then a top coat (7 ma ss%Y2O3-ZrO2) had been deposited by electron beam-physical vapor depositio n (EB-PVD).The phase transformation of ceramic top coat was investigated and the surface morphology change of the samples was observed.It was found that the ZrO 2-7 mass% Y2O3 ceramic top coat deposited by EB-PVD showed columnar grain s which formed dense clusters and the surface was relatively dense.However there were gaps or holes among grain clusters,which allowed the lateral expansion and contraction of the ceramic columnar grains and allowed free expansion of the su bstrate over a relatively large range.After exposure to elevated temperatures,th e gaps among columnar grain clusters became larger.The relatively large gaps int erconnected into one another and formed microcracks.With thermal cycling going o n,the microcracks extended across and through the top coat.Also the Y2O3 con tent in nonequilibrium tetragonal phase decreased gradually,and the nonequilibri um tetragonal phase decomposed to equilibrium tetragonal and cubic phases.After 300 thermal cycles at 1050℃,small amount of monoclinic phase was formed from th e decomposition of the tetragonal phases.

Key words： electron beam physical vapor deposition therma l barrier coating (TBC) microcrack phase transformati

收稿日期: 2001-12-03

ZTFLH:

TG174.451

通讯作者: 李美桓

Corresponding author: Meiheng Li

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引用本文:

李美桓; 孙晓峰; 宫声凯; 张重远; 管恒荣; 胡望宇; 胡壮麒 . EB-PVD热障涂层高温氧化过程中的显微结构和相分析[J]. 中国腐蚀与防护学报, 2002, 22(2): 105-110 .
Meiheng Li, Xiaofeng Sun, Shengkai Gong, Zhongyuan Zhang, Hengrong Guan, Wangyu Hu, Zhuangqi Hu. STUDIES OF MICROSTRUCTURE AND PHASE OF EB-PVDTBCs EXPOSED TO ELEVATED TEMPERATURES. J Chin Soc Corr Pro, 2002, 22(2): 105-110 .

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https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y2002/V22/I2/105

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