Firing of Bauxite Extrudates in a Variable Frequency Microwave Furnace

1998 ◽  
Vol 33 (1) ◽  
pp. 31-35 ◽  
Author(s):  
X. Tan ◽  
N. Munroe ◽  
Z. Fathi ◽  
R. Garard
Keyword(s):  
Variable Frequency ◽  
Microwave Furnace

Multikilowatt Variable Frequency Microwave Furnace

1992 ◽  
Vol 269 ◽  
Author(s):  
D. W. Bible ◽  
R. J. Lauf ◽  
C. A. Everleigh
Keyword(s):  
Electron Beam ◽  
Electromagnetic Wave ◽  
Traveling Wave ◽  
Power Level ◽  
Variable Frequency ◽  
Traveling Wave Tube ◽  
Wave Tube ◽  
Electronic Warfare ◽  
Microwave Furnace ◽  
New Type

ABSTRACTWe describe a new type of microwave processing furnace in which the frequency can be varied continuously from 4 to 8 GHz and the power level varied from zero up to 2.5 kW. The extraordinary bandwidth of this furnace is achieved by using a traveling wave tube (TWT) amplifier originally developed for electronic warfare applications. The TWT is a linear beam device characterized by a traveling electromagnetic wave that continuously extracts energy longitudinally along the path of an electron beam. The TWT, unlike other microwave tubes such as the magnetron, klystron, gyrotron, and others, does not depend upon resonant RF fields and is therefore capable of wide bandwidth operation.

Polymer Curing Using Variable Frequency Microwave Processing

1994 ◽  
Vol 347 ◽  
Author(s):  
April D. Surret ◽  
Robert J. Lauf ◽  
Felix L. Paulauskas ◽  
Arvid C. Johnson
Keyword(s):  
Differential Scanning Calorimetry ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Visual Inspection ◽  
Variable Frequency ◽  
Scanning Calorimetry ◽  
Microwave Furnace ◽  
Polymer Curing ◽  
Cure Time

ABSTRACTEpoxy resin was cured by microwave heating using a variable frequency furnace. Curing behavior and uniformity were characterized by visual inspection, hardness, and differential scanning calorimetry. Frequency sweeping was used as a means of mode stirring to minimize power nonuniformities in the furnace cavity. Cure times were reduced by half and with the appropriate post-cure treatment (also done in the microwave furnace) the resin had a glass transition temperature of 165–175°C. Small amounts of additives such as carbon black and various oxide pigments were tested to determine if they would improve microwave coupling and further reduce cure time. There was little or no effect at a standard concentration of 1 wt% pigment.

Study of Variable Frequency Induction Heating in Steel Making Process

2010 ◽  
Vol 130 (10) ◽  
pp. 1131-1138 ◽  
Author(s):  
Kazuhiko Fukutani ◽  
Kenji Umetsu ◽  
Takeo Itou ◽  
Takanori Isobe ◽  
Tadayuki Kitahara ◽  
...  
Keyword(s):  
Induction Heating ◽  
Variable Frequency ◽  
Steel Making
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