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Stability Study of EBC/TBC Hybrid System on Si-based Ceramics in Gas Turbines

Published online by Cambridge University Press:  07 January 2013

JiaPeng Xu ,
Vinod Sarin  and
Soumendra Basu
JiaPeng Xu
Affiliation:
Division of Materials Science and Engineering, Boston University, Brookline, MA 02446, USA
Vinod Sarin
Affiliation:
Division of Materials Science and Engineering, Boston University, Brookline, MA 02446, USA Department of Mechanical Engineering, Boston University, Boston, MA 02215, USA
Soumendra Basu
Affiliation:
Division of Materials Science and Engineering, Boston University, Brookline, MA 02446, USA Department of Mechanical Engineering, Boston University, Boston, MA 02215, USA
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Abstract

Currently, ceramics are being used under increasingly demanding environments. These materials have to exhibit phase stability and resist chemical attack during service. This research involves the study of the high-temperature stability of ceramic materials in gas turbines. SiC/SiC ceramic matrix composites (CMCs) are being increasingly used in the hot-sections of gas turbines, especially for aerospace applications. These CMCs are prone to recession of their surface if exposed to a flow of high-velocity water vapor, and to hot-corrosion when exposed to molten alkali salts. The objective of this investigation was the development of a hybrid system containing an environmental barrier coating (EBC) for protection of the CMC from chemical attack and a thermal barrier coating (TBC) that allows a steep temperature gradient across it to lower the temperature of the CMC for increased lifetimes. The EBC used was a functionally graded mullite (3Al2O3∙2SiO2) coating deposited by chemical vapor deposition (CVD), while the TBC layer was yttria-stabilized zirconia (YSZ) deposited by air plasma spray (APS). The stability of this system was investigated, via adhesion between the two coating layers and the substrate, the physical and chemical stability of each layer at high temperature, and the performance under severe thermal shock and exposure to hot corrosion.

Keywords

barrier layerchemical vapor deposition (CVD) (deposition)environmentally protective
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1519: Symposium MM – Materials under Extreme Environments , 2013 , mrsf12-1519-mm11-03
Copyright
Copyright © Materials Research Society 2012

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