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NiCoCrAlY-ZrO_2·Y_2O_3 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 ZrO_2·Y_2O_3 layers according to the cross-section morphologies of the samples after high temperature isothermal oxidation.The TGO containsα-Al_2O_3 and Y_4Al_2O_9 etc.oxides.The intensity ratio ofα-Al_2O_3/Y_4Al_2O_9 was monotonously decreased with increasing oxidation time based on XRD (X-ray diffraction) analysis.The Y_4Al_2O_9 phase plays the most important role in high temperature oxidation resistance at 1100℃.The related mechanism was also discussed.
NiCoCrAlY-ZrO 2 · Y 2 O 3 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 ° C. for 100- 300 h. The results show that a thermally grown oxide (TGO) layer was formed between NiCoCrAlY layer and ZrO_2 · Y_2O_3 layers according to the cross-section morphologies of the samples after high temperature isothermal oxidation.The TGO contains α-Al_2O_3 and Y_4Al_2O_9 etc.oxides. The intensity ratio of α-Al_2O_3 / Y_4Al_2O_9 was monotonously decreased with increasing oxidation time based on XRD (X-ray diffraction) analysis. The Y_4Al_2O_9 phase plays the most important role in high temperature oxidation resistance at 1100 ° C. The related mechanism was also discussed.