AN APPLICATION OF INDUCTION HEATING TO ROCK DEFORMATION APPARATUS.
AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS
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High-frequency induction provides the advantages of concentrated, controlled, and instantaneous heating of samples in rock deformation experiments the attendant disadvantages are high initial cost, bulky support equipment, and an inability to use standard temperature-monitoring equipment. A new shear press capable of simultaneously applying pressures of 50 kb and temperatures of 1000 C to thin sample pellets 14 in. to 1 in. in diameter uses a 5-kw, 450-kc induction heater, a Speedomax H recorder, a current-adjusting-type control unit, a saturable-core reactor, a magnetic amplifier, and an infrared pyrometer to accurately record, control, and monitor sample temperatures within 1 percent from 200 to 1000 C. Less than 45 sec is required for the apparatus to reach thermal equilibrium at maximum temperature. Author