Role of Y4Al2O9 in High Temperature Oxidation Resistance of NiCoCrAlY-ZrO2•Y2O3 Coatings

Abstract

Abstract: NiCoCrAlY-ZrO2•Y2O3 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℃ for 100–300 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 α-Al2O3 and Y4Al2O9 etc. oxides. The intensity ratio of α-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℃. The related mechanism was also discussed.

Key words: NiCoCrAlY-ZrO2·Y2O3 coatings, XRD, Al2Y4O9

Shuqin YANG, Xiaohua LAN, Ningkang HUANG. Role of Y4Al2O9 in High Temperature Oxidation Resistance of NiCoCrAlY-ZrO2•Y2O3 Coatings[J]. J Mater Sci Technol, 2007, 23(04): 568-570.

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Role of Y4Al2O9 in High Temperature Oxidation Resistance of NiCoCrAlY-ZrO2•Y2O3 Coatings

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