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1 Archives of Materials Science

1 2008

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Effect of the microstructure of EB-PVD thermal barrier coatings on the thermal conductivity and the methods to reduce the thermal conductivity

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Altun O. , Boke Y. E.

Archives of Materials Science

2008

tom Vol. 29, nr 1-2

7-15

Nowadays, the selection of the materials for usage aim is getting important because of the new high technologic developments. Especially for the parts operating at high temperatures, the materials which have low thermal conductivity and high mechanical resistance are preferred. Thermal Barrier Coatings (TBCs) are used in aerospace, diesel engine and power plant technologies due to porous structures and low thermal conductivity. Generally these coatings are applied by two methods, Electron Beam-Plasma Vapor Deposition (EB-PVD) and Atmospheric Plasma Spray (APS). EBPVD method provides the advantages of superior strain and thermal shock tolerant due to its columnar microsturucture. However this columnar structure increases the thermal conductivity of the coating, so this is an undesired property with regard to heat transfer. In this study, the effect of microstructure of the coating to the thermal conductivity of EB-PVD TBCs and the methods to reduce the thermal conductivity of these coatings have been investigated.