Microwave processing of silicon nitride for advanced gas turbine applications
Results from previous studies on microwave processing of silicon nitride-based ceramics are reviewed to ascertain the application of this technology to advanced gas turbine (AGT) materials. Areas of microwave processing that have been examined in the past are (1) sintering of powder compacts; (2) heat treatment of dense materials; and (3) nitridation of Si for reactionbonded silicon nitride. The sintering of Si[sub 3]N[sub 4] powder compacts showed improved densification and enhanced grain growth. However, the high additive levels required to produce crack-free parts generally limit these materials to low temperature applications. Improved high-temperature creep resistance has been observed for microwave heat-treated materials and therefore has application to materials used in highly demanding service conditions. In contrast to Si[sub 3]N[sub 4], Si couples well in the microwave and sintered reaction-bonded silicon nitride materials have been fabricated in a one-step process with cost-effective raw materials. However, these materials are also limited to lower temperature applications, under about 1000[degrees]C.
- Research Organization:
- Oak Ridge National Lab., TN (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6953187
- Report Number(s):
- CONF-930502-4; ON: DE93007910
- Resource Relation:
- Conference: 38. ASME international gas turbine and aeroengine congress and exhibition, Cincinnati, OH (United States), 24-27 May 1993
- Country of Publication:
- United States
- Language:
- English
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33 ADVANCED PROPULSION SYSTEMS
SILICON
NITRIDATION
SILICON NITRIDES
MICROWAVE HEATING
ANNEALING
COMPACTS
GAS TURBINE ENGINES
HEAT TREATMENTS
REVIEWS
SINTERING
CHEMICAL REACTIONS
DOCUMENT TYPES
ELEMENTS
ENGINES
FABRICATION
HEAT ENGINES
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INTERNAL COMBUSTION ENGINES
NITRIDES
NITROGEN COMPOUNDS
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360201* - Ceramics
Cermets
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330103 - Internal Combustion Engines- Turbine