Brittle Materials Design, High Temperature Gas Turbine

The program objective is to demonstrate successful use of brittle materials in high temperature structural applications. A small vehicular gas turbine and a large stationary gas turbine, each using uncooled ceramic components, will be utilized in this program. In the vehicular turbine project, a maj...

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Bibliographic Details
Main Authors: McLean, Arthur F, Fisher, Eugene A, Bratton, Raymond J, Miller, Donald G
Format: Report
Language:English
Subjects:
AIRCRAFT ENGINES
Ceramics, Refractories and Glass
COMBUSTORS
FABRICATION
GAS BEARINGS
GAS TURBINE BLADES
GAS TURBINE ROTORS
GAS TURBINES
HIGH TEMPERATURE
Jet and Gas Turbine Engines
JET ENGINE INLETS
JET ENGINES
MARINE ENGINES
NONDESTRUCTIVE TESTING
SILICON NITRIDES
STATIONARY
STRESS ANALYSIS
STRUCTURAL PROPERTIES
TEST METHODS
TUBES
TURBINE COMPONENTS
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Summary:The program objective is to demonstrate successful use of brittle materials in high temperature structural applications. A small vehicular gas turbine and a large stationary gas turbine, each using uncooled ceramic components, will be utilized in this program. In the vehicular turbine project, a major program milestone, comprising a 100 hour durability test of the stationary ceramic hot flow path components in an engine was completed. In the fabrication of ceramic turbine rotors, significant improvement in bonding the components of the silicon nitride duo density rotor resulted when hot pressing of the shaped hub was combined with press bonding to the blade ring. Spin testing of seven hot pressed silicon nitride rotor hubs, with burst speeds ranging from 102,000 to 120,000 rpm, confirmed that this material was adequate for rotor requirements. A silicon carbide combustor tube has been successfully tested in a combustor rig for a total of 171 hours, including 20 hours at an outlet temperature of 2500 F. In the stationary turbine project, static rig testing of hot pressed silicon nitride and silicon carbide stator vanes up to 2500 F was initiated. Prepared in cooperation with Westinghouse Electric Corp., Pittsburgh, Pa.