Brittle Materials Design, High Temperature Gas Turbine

The 'Brittle Materials Design, High Temperature Gas Turbine' program is to demonstrate successful use of brittle materials in demanding high temperature structural applications. A small vehicular gas turbine and a large stationary gas turbine, each utilizing uncooled ceramic components, wi...

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Bibliographic Details
Main Authors: McLean, Arthur F, Fisher, Eugene A, Bratton, Raymond J
Format: Report
Language:English
Subjects:
AIRFOILS
BONDING
BRITTLENESS
CERAMIC MATERIALS
Ceramics, Refractories and Glass
COMPUTER PROGRAMS
CORROSION
CREEP
DRIVE SHAFTS
DYNAMICS
EROSION
ETCHING
FATIGUE(MECHANICS)
FRACTURE(MECHANICS)
GAS TURBINES
HEAT RESISTANT MATERIALS
HEAT TRANSFER
Jet and Gas Turbine Engines
MICROSTRUCTURE
Miscellaneous Materials
NITROGEN
NONDESTRUCTIVE TESTING
OXIDATION
QUALITY CONTROL
ROTORS
SILICON CARBIDES
SILICON NITRIDES
SILICONES
STRAIN(MECHANICS)
STRESSES
THERMAL CONDUCTIVITY
TURBINE BLADES
VAPOR PLATING
VEHICLES
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Summary:The 'Brittle Materials Design, High Temperature Gas Turbine' program is to demonstrate successful use of brittle materials in demanding high temperature structural applications. A small vehicular gas turbine and a large stationary gas turbine, each utilizing uncooled ceramic components, will be used in this iterative design and materials development program. In the vehicular turbine project, the improved second generation (Design B) stationary ceramic components made of reaction bonded silicon nitride have undergone initial engine tests successfully. A computer program has been developed to determine heat transfer in the rotor, attachment, and shaft assembly. A design study was completed for the attachment of the rotor to the shaft. A complete integral rotor has been fabricated by chemical vapor deposition of silicon carbide, although material quality needs improvement. An etching technique has been developed permitting microstructure study of any form of silicon nitride, and significant determinations were made of ceramic material properties. In the stationary turbine project, a first generation 3-piece vane assembly was designed and analyzed. A complete set of silicon nitride airfoil vanes were fabricated. Engineering properties of silicon nitride and silicon carbide have been characterized. A better understanding of the effects of microstructure on properties of hot pressed silicon nitride was obtained. Data was obtained on static oxidation kinetics and corrosion-erosion behavior. Prepared in cooperation with Westinghouse Electric Corp., Pittsburgh, Pa. Sponsored in Part by DARPA.