Thermocyclic behavior of sputtered NiCrAlY/EB-PVD 7 wt.%Y2O3-ZrO2 thermal barrier coatings

doi:10.1016/j.surfcoat.2004.12.014

IMR OpenIR

	Thermocyclic behavior of sputtered NiCrAlY/EB-PVD 7 wt.%Y2O3-ZrO2 thermal barrier coatings
	Li, MH ; Sun, XF ; Hu, WY ; Guan, HR
通讯作者	Li, MH(mhli2003@163.com)
	2006-03-31
发表期刊	SURFACE & COATINGS TECHNOLOGY
ISSN	0257-8972
卷号	200 期号:12-13 页码:3770-3774
摘要	Yttria partially stabilized zirconia (YPSZ) ceramic top coat was deposited on a sputtered NiCrAlY bond coat by electron beam physical vapor deposition (EB-PVD) and the thermal cycling behavior was studied at 1050 degrees C. Experimental characterization was conducted by X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM), equipped with energy dispersive analytical Xray spectroscopy (EDAX). The results showed that the TGO was only Al2O3 for the TBCs after 200 cycles. With aluminum depletion in the bond coat, NiO, Ni(Cr, Al)(2)O-4 and other spinel formed near the bond coat. The degradation of the TBCs was mainly at the interface between the bond coat and the TGO, due to the spallation of the YPSZ ceramic top coat from the bond coat with TGO scale still adhering to YPSZ. The failure mechanism of the EB-PVD TBCs was proposed as follows: during thermal cycling, microcracks are initiated preferentially in the ceramic top coat along columnar boundaries and then extend through and along the top coat. The growth stress of TGO together with thermal stress imposed by cycling leads to the separation at the bond coat/TGO interface. Once longitudinal cracks penetrate through the ceramic top coat and leads damage to the nearby TGO, the ceramic top coat spalls from the cracked bond coat/TGO interface with the TGO scale still adhered. (c) 2005 Elsevier B.V. All rights reserved.
关键词	thermal barrier coatings electron beam physical vapor deposition thermal cycling failure mechanism
DOI	10.1016/j.surfcoat.2004.12.014
收录类别	SCI
语种	英语
WOS研究方向	Materials Science ; Physics
WOS类目	Materials Science, Coatings & Films ; Physics, Applied
WOS记录号	WOS:000235981600015
出版者	ELSEVIER SCIENCE SA
引用统计	被引频次：17[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/86750
专题	中国科学院金属研究所
通讯作者	Li, MH
作者单位	1.Hunan Univ, Dept Appl Phys, Changsha 410082, Peoples R China 2.Chinese Acad Sci, Met Res Inst, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Li, MH,Sun, XF,Hu, WY,et al. Thermocyclic behavior of sputtered NiCrAlY/EB-PVD 7 wt.%Y2O3-ZrO2 thermal barrier coatings[J]. SURFACE & COATINGS TECHNOLOGY,2006,200(12-13):3770-3774.
APA	Li, MH,Sun, XF,Hu, WY,&Guan, HR.(2006).Thermocyclic behavior of sputtered NiCrAlY/EB-PVD 7 wt.%Y2O3-ZrO2 thermal barrier coatings.SURFACE & COATINGS TECHNOLOGY,200(12-13),3770-3774.
MLA	Li, MH,et al."Thermocyclic behavior of sputtered NiCrAlY/EB-PVD 7 wt.%Y2O3-ZrO2 thermal barrier coatings".SURFACE & COATINGS TECHNOLOGY 200.12-13(2006):3770-3774.