Processing aersols and filaments in a TM sub 010 microwave cavity at 2. 45 GHz
As part of the development of generic microwave processes for spray-drying of homogeneous complex metal oxide powders and for inorganic fiber processing, we have investigated the use of 2.45 GHz microwaves in a high-Q single-mode TM{sub 010} cavity coupled directly to aerosols and fibers. Aqueous and ethanol aerosols of ferric nitrate solutions have been successfully dried at 1.8 kW of cavity power for a loaded Q greater than 6000 in flowing nitrogen gas. Similarly, we have observed extremely rapid heating rates in the TM{sub 010} cavity for small-diameter confined cylinders of water and lossy inorganic fibers. These observations suggest using 2.45 GHz microwave power for drying, calcining, and sintering extruded ceramic filaments. Droplet modeling indicates that the large dielectric shielding for spherical droplets can significantly limit the coupling of 2.45 GHz microwave with spherical aerosols, but not with fibers. Experimental observations on the microwave interactions with ferric nitrate aerosols and with ceramic filaments in the TM{sub 010} cavity are described.
- 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:
- 5235536
- Report Number(s):
- LA-UR-92-1289; CONF-920402-5; ON: DE92013536
- Resource Relation:
- Conference: Material Research Society spring meeting, San Francisco, CA (United States), 27 Apr - 2 May 1992
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AEROSOLS
SPRAY DRYING
FILAMENTS
IRON NITRATES
FIBERS
MICROWAVE RADIATION
RADIATION HEATING
COLLOIDS
DISPERSIONS
DRYING
ELECTROMAGNETIC RADIATION
HEATING
IRON COMPOUNDS
NITRATES
NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
RADIATIONS
SOLS
TRANSITION ELEMENT COMPOUNDS
360601* - Other Materials- Preparation & Manufacture