Oxidation and degradation of EB-PVD thermal-barrier coatings

IMR OpenIR

	Oxidation and degradation of EB-PVD thermal-barrier coatings
	M. H. Li; Z. Y. Zhang; X. F. Sun; H. R. Guan; W. Y. Hu; Z. Q. Hu
	2002
发表期刊	Oxidation of Metals
ISSN	0030-770X
卷号	58 期号:5-6 页码:499-512
摘要	Thermal-barrier coatings (TBCs) consist of a magnetron-sputtered Ni-30Cr-12Al-0.3 Y (wt.%) bond coat to protect the substrate superalloy from oxidation/hot corrosion and an electron-beam physical-vapor deposited (EB-PVD) 7 wt.% yttria partially stabilized zirconia (YPSZ) top coat. The thermal cyclic life of the TBC system was assessed by furnace cycling at 1050degreesC. The oxidation kinetics were evaluated by thermogravimetric analysis (TGA) at 900, 1000, and 1100degreesC for up to 100 hr. The results showed that the weight gain of the specimens at 1100degreesC was the smallest in the initial 20 hr, and the oxide scale formed on the sputtered Ni-Cr-Al-Y bond coat is only Al2O3 at the early stage of oxidation. With aluminum depletion in the bond coat, NiO, Ni(Cr,Al)(2)O-4, and other spinel formed near the bond coat. During thermal cycling, microcracks were initiated preferentially in the YPSZ top coat along columnar grain boundaries and then extended through and along the top coat. The growth stress of TGO added to the thermal stress imposed by cycling, lead to the separation at the bond coat-TGO interface. The ceramic top coat spalled with the oxide scale still adhering to the YPSZ after specimens had been cycled at 1050degreesC for 300 cycles. The failure mode of the EB-PVD ZrO2-7 wt.% Y2O3 sputtered Ni-Cr-Al-Y thermal-barrier coating was spallation at the bond coat-TGO interface.
部门归属	chinese acad sci, inst met res, shenyang 110016, peoples r china. human univ, coll mat sci & engn, changsha 410082, peoples r china.;li, mh (reprint author), chinese acad sci, inst met res, shenyang 110016, peoples r china
关键词	Magnetron Sputtering Electron-beam Physical Vapor Deposition Thermal Barrier Coating Oxidation Degradation
URL	查看原文
WOS记录号	WOS:000178436100005
引用统计	被引频次：32[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/321006/36312
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	M. H. Li,Z. Y. Zhang,X. F. Sun,et al. Oxidation and degradation of EB-PVD thermal-barrier coatings[J]. Oxidation of Metals,2002,58(5-6):499-512.
APA	M. H. Li,Z. Y. Zhang,X. F. Sun,H. R. Guan,W. Y. Hu,&Z. Q. Hu.(2002).Oxidation and degradation of EB-PVD thermal-barrier coatings.Oxidation of Metals,58(5-6),499-512.
MLA	M. H. Li,et al."Oxidation and degradation of EB-PVD thermal-barrier coatings".Oxidation of Metals 58.5-6(2002):499-512.