Effect of Cerium and Silicon Additions to MCrAIY on the High-Temperature Oxidation Behavior and Bond Strength of Thermal Barrier Coatings

Masatoshi Tanno; Kazuhiro Ogawa; Tetsuo Shoji

doi:10.4028/www.scientific.net/KEM.261-263.1061

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 261-263Effect of Cerium and Silicon Additions to MCrAIY...

Effect of Cerium and Silicon Additions to MCrAIY on the High-Temperature Oxidation Behavior and Bond Strength of Thermal Barrier Coatings

Abstract:

It is well known, that thermally grown oxide (TGO) forms at the interface between the thermal barrier top coating (TBC) and the bond coating during service. In previous work, SEM images showed that the TGO layer contained at least two layers with different oxides. One layer was Al2O3, and the other was a mixed oxide of NiO, CoO, Cr2O3, and their spinels. It was supposed that a reason for macro-crack formation near an interface is due to a decrease in bond strength or to the formation of stress concentration sites caused by the formation of pores in the mixed oxide. In order to improve the bond strength, a modified bond coating material was developed, which is MCrAlY with Ce and Si added. Four- point bending tests were carried out to measure the bond strength of conventional TBC and of the modified TBC with MCrAlYCeSi bond coating. As a result, the TBC with modified bond coating had a bond strength superior to the conventional one. It is likely that the reason for the superior bond strength is due to a notable difference in oxidation behavior.

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Periodical:

Key Engineering Materials (Volumes 261-263)

Pages:

1061-1066

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.261-263.1061

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Online since:

April 2004

Authors:

Masatoshi Tanno, Kazuhiro Ogawa, Tetsuo Shoji

Keywords:

Acoustic Emission (AE), Aluminum (Al), Bond Coatings, Bond Strength, Interface, Mixed Oxide, Thermal Barrier Coating (TBC), Thermally Grown Oxide (TGO)

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References

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00 0. 01 0. 02 0. 03 0. 04 0. 05 0. 06 0. 07 0. 08.

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[1] 2x10 6 AE count MCrAlY / YSZ MCrAlYCeSi / YSZ Cumulative AE count Strain 0 20 40 60 80 100 � � � � � � � � � � � � � � � Delamination ratio (%) Delamination ratio MCrAlY / YSZ MCrAlYCeSi / YSZ.

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