Alloys and Coating Development for Metallic TPS for Reusable Launch Vehicles William D. Brewer* Keith Bird* Terryl Wallace* S.A. Sankaran** *Metals and Thermal Structures Branch Structures & Materials Competency NASA Langley Research Center Hampton VA **Analytical Services and Materials Hampton VA Langley Research Center National Space & Missile Materials Symposium 28 Feb. - 2 Mar. 2000 San Diego CA
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TPS for Reusable Launch Vehicles Alloys and Coating ...
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Alloys and Coating Development for MetallicTPS for Reusable Launch Vehicles
William D. Brewer*Keith Bird*
Terryl Wallace*S.A. Sankaran**
*Metals and Thermal Structures BranchStructures & Materials Competency
NASA Langley Research CenterHampton VA
**Analytical Services and MaterialsHampton VA
Langley ResearchCenter
National Space & Missile Materials Symposium28 Feb. - 2 Mar. 2000
San Diego CA
¥ Constituents and Fabrication Development for Metallic TPS- Alloy evaluation- Coating development
¥ Metallic TPS Concepts- Design/size alternative metallic TPS- Fabricate & test full size panel array- System performance & model validation
¥ Cryogenic Tank Subcomponent Development- Design, fabricate & test full-scale PMC LH2 tank
subcomponent.
¥ Integrated PMC Cryogenic Tank and TPS Structure Demonstration- Full-scale integrated PMC tank/metallic TPS panel tests- Evaluate thermal and mechanical behavior
Reusable Launch VehicleFocused Airframe Systems Technologies
Langley ResearchCenter
Acreage TPS for Windwardand Leeward Surfaces
Hot Structure Control Surfaces
Leading Edges and Nose Caps
TPS for Reusable Launch Vehicles
Langley ResearchCenter
Metallic TPS
Foil encapsulatedinsulation
Attachment standoffbrackets
Externalcryotank stiffeners
Outer metallichoneycomb
Fasteneraccesscovers
Panel-to-panel seal
X-33 TPS ¥ Outer surface pressure-hot seals ¥ Hot fasteners ¥ Little acoustic/vibration damping ¥ Simpler construction
Alternative Design ¥ Cool, sub-surface pressure seals ¥ Cool, sub-surface fasteners ¥ Unload outer surface from pressure ¥ Provides damping ¥ More complex construction
Representative Temperature HistoriesFor RLV Reentry Langley Research
Center
Key Alloy/Surface Requirements
¥ High specific strength and modulus at max service temperature¥ High creep strength¥ Microstructural stability during service life¥ Easily processed to sheet and foil gages¥ Minimum effects of secondary processing¥ Light weight
¥ Coating thickness: < 0.002 in. Minimize weight.¥ Cure time: Short - minimize fab.¥ Cure temperature Low - enhance field repair¥ Durability: No crack/spall in handling or service¥ Repair: In the field¥ Service Temp: At least as high as metal operating T.
ALLOYS
COATINGS
Langley ResearchCenter
¥ Evaluate candidate alloys and fabrication practice for foil gage product form and TPS concepts
OBJECTIVES
¥ Develop durable, field repairable coatings for environmental protection and thermal control