Performance of CVD Al<SUB>2</SUB>O<SUB>3</SUB> Intermediate Layer between Zirconia Top Coat and NiCrAlY Bond Coat
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概要
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An attempt to apply CVD Al<SUB>2</SUB>O<SUB>3</SUB> coating as an intermediate layer to ZrO<SUB>2</SUB>-8 mass% Y<SUB>2</SUB>O<SUB>3</SUB>/Ni–22Cr–10Al–1Y thermal barrier coatings (TBCs) for protecting the Ni–22Cr–10Al–1Y bond coat from oxidation during cyclic operations was evaluated in this study. Results of this study showed that the intermediate CVD Al<SUB>2</SUB>O<SUB>3</SUB> layer between the zirconia top coat and the Ni–22Cr–10Al–1Y bond coat can effectively reduce the oxidation rate of the bond coat and hence remarkably improve the performance of TBCs under thermal cycling tests at 1273 K. However, optimization of the CVD process parameters is needed to exclude the adverse effects induced by the application of CVD Al<SUB>2</SUB>O<SUB>3</SUB> in the TBC systems; i.e., an increase in operationally induced stresses and premature failures resulting from undesirable Al<SUB>2</SUB>O<SUB>3</SUB> morphologies. It was concluded that the thickness and microstructure of CVD Al<SUB>2</SUB>O<SUB>3</SUB>, which are affected by the processing parameters, are the main factors influencing the cyclic life of triplex ZrO<SUB>2</SUB>-8 mass% Y<SUB>2</SUB>O<SUB>3</SUB>/CVD Al<SUB>2</SUB>O<SUB>3</SUB>/Ni–22Cr–10Al–1Y thermal barrier coatings.
- 社団法人 日本金属学会の論文
社団法人 日本金属学会 | 論文
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