NDLI: Mullite+cas bond coat for environmental barrier coatings for si-based ceramics

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Mullite+cas bond coat for environmental barrier coatings for si-based ceramics

Content Provider	NASA Technical Reports Server (NTRS)
Author	Lee, Kang N. Opila, Elizabeth J.
Copyright Year	2002
Description	Current environmental barrier coatings (EBCs) for silicon-based ceramics consist of a bond coat and a top coat. Mullite bond coat modified by adding low CTE glass ceramics, such as BSAS (xBaO.1xSrO.Al2O3.2SiO2) or CAS (CaO.Al2O3.2SiO2), was developed in the NASA Enabling Propulsion Materials (EPM) Program. EBCs based on mullite+CAS bond coat were characterized using high steam thermal cycling test and high steam isothermal thermogravemitry (TGA) at 1225 C - 13,000 C. The Mullite+CAS bond coat showed far superior durability compared to mullite bond coat, due to enhanced crack resistance. A BSAS top coat provided further improved durability compared to EBCs with a yttria-stabilized zirconia (YSZ) top coat. Still further improvement in the durability was achieved by adding a silicon bond coat between the mullite and the substrate. However, the silicon/mullite+CAS/BSAS EBC showed inferior long-term durability compared to the current state-of-the art EBC (silicon/mullite+BSAS/BSAS EBC), presumably due to the higher CAS-silica chemical reactivity.
File Size	8688219
Page Count	13
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20020072966
Archival Resource Key	ark:/13960/t7dr7t032
Language	English
Publisher Date	2002-01-01
Access Restriction	Open
Subject Keyword	Nonmetallic Materials Mullites Chemical Analysis Thermogravimetry Gas Turbine Engines Thermal Cycling Tests Durability Chemical Reactions Ceramics Water Vapor Crack Propagation Yttria-stabilized Zirconia Silicon Protective Coatings Crack Initiation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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