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Ultra-High Temperature Ceramic Composites for Leading EdgesUltra-high temperature ceramics (UHTC) have performed unreliably due to material flaws and attachment design. These deficiencies are brought to the fore by the low fracture toughness and thermal shock resistance of UHTC. If these deficiencies are overcome, we are still faced with poor oxidation resistance as a limitation on UHTC applicability to reusable launch vehicles. We have been addressing the deficiencies of UHTC for the past two years via a small task at GRC that is in the Airframe part of the Next Generation Launch Technology Program. Our focus is on composite constructions and functional grading to address the mechanical issues and on composition modification to address the oxidation issue. The progress on approaches to improving oxidation resistance by alloying and functional grading will be reported. In particular, initial tests of tantalum additions have shown potential for major improvement. Results for additional tests at higher temperatures will be presented. These oxidation improvements are being incorporated in the composites approaches. Two fabrication approaches are being persued to produce carbon fiber reinforced UHTC composites: prepregging and rigid perform infiltration. Fabrication procedures, microstructures, and initial mechanical property and oxidation results for composites will be reported.
Document ID
20040033992
Acquisition Source
Glenn Research Center
Document Type
Preprint (Draft being sent to journal)
Authors
Levine, Stanley R.
(NASA Glenn Research Center Cleveland, OH, United States)
Opila, Elizabeth J.
(NASA Glenn Research Center Cleveland, OH, United States)
Lorincz, Jonathan A.
(Ohio Univ. Athens, OH, United States)
Robinson, Raymond C.
(QSS Group, Inc. Brook Park, OH, United States)
Singh, Mrityunjay
(QSS Group, Inc. Brook Park, OH, United States)
Petko, Jeanne
(QSS Group, Inc. Brook Park, OH, United States)
Ellerby, Donald T.
(NASA Ames Research Center Moffett Field, CA, United States)
Gasch, Matthew J.
(Eloret Corp. Moffett Field, CA, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2003
Subject Category
Composite Materials
Meeting Information
Meeting: JANNAF 39th Combustion/27th Airbreathing Propulsion/21st Propulsion Systems Hazards/3rd Modeling and Simulation Joint Subcommittee Meeting
Location: Colorado Springs, CO
Country: United States
Start Date: December 1, 2003
End Date: December 5, 2003
Sponsors: Department of the Army, Department of the Navy, Department of the Air Force, NASA Headquarters
Funding Number(s)
OTHER: 22-794-40-45
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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