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3993 |
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Microstructure behavior relationship of plasma sprayed mullit+YSZ+Al2O3 coatings |
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Y1ld1z Yarali Özbek* / sakarya university, turkey M. Opek / Sakarya University Engineering Faculty Department of Metallurgy and Materials Eng., TURKEY G. Erdogan/ Sakarya University Engineering Faculty Department of Metallurgy and Materials Eng., TURKEY Fatih Üstel/ Sakarya University Engineering Faculty Department of Metallurgy and Materials Eng., TURKEY |
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The YSZ/mullite+Al2O3 composite coatings have been given an impression for improved high temperature resistance over YSZ coatings under severe service conditions and should be investigated further for its possible use in thermal barrier coating (TBC) systems. In this study, a composite thermal barrier coating made from a combination of YSZ and mullite (wt%25 to 50) +Al2O3 was investigated. Powders of each powder were mechanically mixed together and then sprayed on superalloy substrates. Microstructure and mechanical behaviour relationship of these composite coatings were investigated. Crystallinity and phase ratios were determined by XRD analysis. Results showed that mullite and alumina addition improved the mechanical behaviour of YSZ coating under high temperature conditions. The corrosion tests were done. |