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2633 |
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Thursday, September 29, 2011, Saal A 9:00 AM Industrial Gas Turbines 2 |
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Oxidation behavior of bond coats with and without Y addition |
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Takeshi Izumi* / Hitachi,Ltd., Japan Hideyuki Arikawa / Hitachi, Ltd. Materials Reserch Laboratory, Japan Yoshitaka Kojima/ Hitachi, Ltd. Materials Reserch Laboratory, Japan Mitsutoshi Okada/ CRIEPI. Energy Engineering Research Laboratory, Japan Tohru Hisamatsu/ CRIEPI. Energy Engineering Research Laboratory, Japan |
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In this study, effects of bond coats with and without Y addition on the TGO formation were investigated. After 2000h isothermal test at 1050°C, the TGO formed on Y-free CoNiCrAl coating was composed mainly of alumina without the presence of Y-rich oxide and thickness was about 40% thinner than that formed on conventional CoNiCrAlY coating. This result indicates that potential improvements to the bond coat oxidation behaviour can be achieved using Y-free bond coat compositions. |