Electric heating – Metal heating – Of cylinders
Patent
1992-11-04
1993-11-30
Leung, Philip H.
Electric heating
Metal heating
Of cylinders
219 1055M, 219 1081, 264 26, 4251748E, H05B 680, H05B 654
Patent
active
052667626
ABSTRACT:
Radio frequency energy is used to sinter ceramic materials. A coaxial waveguide resonator produces a TEM mode wave which generates a high field capacitive region in which a sample of the ceramic material is located. Frequency of the power source is kept in the range of radio frequency, and preferably between 60-80 MHz. An alternative embodiment provides a tunable radio frequency circuit which includes a series input capacitor and a parallel capacitor, with the sintered ceramic connected by an inductive lead. This arrangement permits matching of impedance over a wide range of dielectric constants, ceramic volumes, and loss tangents.
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Hoffman Daniel J.
Kimrey, Jr. Harold D.
Adams Harold W.
Leung Philip H.
Martin Marietta Energy Systems Inc.
Pennington Edward A.
Spicer James M.
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