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Oxidation Study of an Ultra High Temperature Ceramic Coatings Based on HfSiCNHigh temperature fiber-reinforced ceramic matrix composites (CMCs) are important for aerospace applications because of their low density, high strength, and significantly higher-temperature capabilities compared to conventional metallic systems. The use of the SiCf/SiC and Cf/SiC CMCs allows the design of lighter-weight, more fuel efficient aircraft engines and also more advanced spacecraft airframe thermal protection systems. However, CMCs have to be protected with advanced environmental barrier coatings when they are incorporated into components for the harsh environments such as in aircraft engine or spacecraft applications. In this study, high temperature oxidation kinetics of an advanced HfSiCN coating on Cf/SiC CMC substrates were investigated at 1300 C, 1400 C, and 1500 C by using thermogravimetric analysis (TGA). The coating oxidation reaction parabolic rate constant and activation energy were estimated from the experimental results. The oxidation reaction studies showed that the coatings formed the most stable, predominant HfSiO4-HfO2 scales at 1400 C. A peroxidation test at 1400 C then followed by subsequent oxidation tests at various temperatures also showed more adherent scales and slower scale growth because of reduced the initial transient oxidation stage and increased HfSiO4-HfO2 content in the scales formed on the HfSiCN coatings.
Document ID
20180002429
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Authors
Sacksteder, Dagny
(Highland High School Medina, OH, United States)
Waters, Deborah L.
(NASA Glenn Research Center Cleveland, OH, United States)
Zhu, Dongming
(NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
April 17, 2018
Publication Date
April 1, 2018
Subject Category
Composite Materials
Report/Patent Number
E-19491
NASA/TM-2018-219789
GRC-E-DAA-TN51074
Meeting Information
Meeting: International Conference and Expo on Advanced Ceramics and Composites
Location: Daytona Beach, FL
Country: United States
Start Date: January 21, 2018
End Date: January 26, 2018
Sponsors: American Ceramic Society
Funding Number(s)
WBS: WBS 109492.02.03.02.01
CONTRACT_GRANT: NNC16ZA09D
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
Ultra High Temperature Ceramics (UHTC)
Environmental Barrier Coatings
Ceramic matrix composites
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