Microwave hybrid heating of alumina filaments

Conference · Fri Jan 01 04:00:00 EST 1993

OSTI ID:6490321

Vogt, G J; Unruh, W P

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 Lab., NM (United States)
• Sponsoring Organization: DOE; 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
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON
CERAMICS
CHALCOGENIDES
COATINGS
ELEMENTS
FABRICATION
FIBERS
FILAMENTS
HEATING
MICROWAVE HEATING
NONMETALS
OXIDES
OXYGEN COMPOUNDS
SINTERING
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K