Role of Y4Al2O9 in high temperature oxidation resistance of NiCoCrAlY-ZrO2•Y2O3 coatings

被引：0
作者：
Yang, Shuqin [1 ]
Lan, Xiaohua [1 ]
Huang, Ningkang [1 ]
机构：
[1] Sichuan Univ, Inst Nucl Sci & Technol, Key Lab Radiat Phys & Technol Educ Minist China, Chengdu 610064, Peoples R China
来源：
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2007年 / 23卷 / 04期
关键词：
NiCoCrAlY-(ZrO2Y2O3)-Y-. coatings; XRD; Al2Y4O9;
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
NiCoCrAlY-(ZrO2Y2O3)-Y-. coatings were deposited on the substrates by using a technology of combining electron, atom and ion beams (three beams). Isothermal oxidation for these samples was performed at 1100 degrees C for 100300 h. The results show that a thermally grown oxide (TGO) layer was formed between NiCoCrAlY layer and ZrO2.Y2O3 layers according to the cross-section morphologies of the samples after high temperature isothermal oxidation. The TGO contains alpha-Al2O3 and Y4Al2O9 etc. oxides. The intensity ratio of alpha-Al2O3/Y4Al2O9 was monotonously decreased with increasing oxidation time based on XRD (X-ray diffraction) analysis. The Y4Al2O9 phase plays the most important role in high temperature oxidation resistance at 1100 degrees C. The related mechanism was also discussed.
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页码：568 / 570
页数：3
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