Microwave hybrid heating of alumina filaments
Low loss oxide ceramics filaments are not readily heated to sintering temperatures (>900[degrees]C) by direct microwave heating at 2.45 GHz. Use of high power levels typically yields thermal runaway with catastrophic melting. In other studies, hybrid, or indirect, heating has been successfully applied to processing bulk oxide ceramics. In this work, commercial alumina-based filaments have been indirectly heated to 700[degrees]--900[degrees]C through a lossy carbon coating on the filament tow. Specific filaments can reach higher temperatures by direct coupling after preheating with a lossy coating. The results of microwave hybrid heating in a single mode TE[sub 102] cavity will be described for commercial alumina-based filaments.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 6490321
- Report Number(s):
- LA-UR-93-1306; CONF-930438-9; ON: DE93012642
- Resource Relation:
- Conference: 95. annual meeting of the American Ceramic Society, Cincinnati, OH (United States), 18-22 Apr 1993
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALUMINIUM OXIDES
MICROWAVE HEATING
CARBON
CERAMICS
COATINGS
FIBERS
FILAMENTS
SINTERING
TEMPERATURE RANGE 0400-1000 K
ALUMINIUM COMPOUNDS
CHALCOGENIDES
ELEMENTS
FABRICATION
HEATING
NONMETALS
OXIDES
OXYGEN COMPOUNDS
TEMPERATURE RANGE
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication