GLTRS--Glenn
TITLE AND SUBTITLE:
Thermal Conductivity and Sintering Behavior of Advanced Thermal Barrier Coatings

AUTHOR(S):
Dongming Zhu and Robert A. Miller

REPORT DATE:
May 2002

FUNDING NUMBERS:
WU-714-04-20-00

PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
John H. Glenn Research Center at Lewis Field
Cleveland, Ohio 44135-3191

PERFORMING ORGANIZATION REPORT NUMBER:
E-13249

SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
Washington, DC 20546-0001

REPORT TYPE AND DATES COVERED:
Technical Memorandum

SPONSORING/MONITORING AGENCY REPORT NUMBER:
NASA TM-2002-211481

SUPPLEMENTARY NOTES:
Prepared for the 26th Annual International Conference on Advanced Ceramics and Composites sponsored by the American Ceramics Society, Cocoa Beach, Florida, January 13-18, 2002. Dongming Zhu, Ohio Aerospace Institute, 22800 Cedar Point Road, Brook Park, Ohio 44142; and Robert A. Miller, NASA Glenn Research Center. Responsible person, Dongming Zhu, organization code 5160, 216-433-5422.

ABSTRACT:
Advanced thermal barrier coatings, having significantly reduced long-term thermal conductivities, are being developed using an approach that emphasizes real-time monitoring of thermal conductivity under conditions that are engine-like in terms of temperatures and heat fluxes. This is in contrast to the traditional approach where coatings are initially optimized in terms of furnace and burner rig durability with subsequent measurement in the as-processed or furnace-sintered condition. The present work establishes a laser high-heat-flux test as the basis for evaluating advanced plasma-sprayed and physical vapor-deposited thermal barrier coatings under the NASA Ultra Efficient Engine Technology (UEET) Program. The candidate coating materials for this program are novel thermal barrier coatings that are found to have significantly reduced thermal conductivities due to an oxide-defect-cluster design. Critical issues for designing advanced low conductivity coatings with improved coating durability are also discussed.

SUBJECT TERMS:
Thermal barrier coatings; Low thermal conductivity; Sintering; Thermal gradient testing

NUMBER OF PAGES:
16

PDF AVAILABLE FROM URL:
2002/TM-2002-211481.pdf
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