高周波誘導過熱真空炉の構造と性能

概要

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The characteristics of a newly installed vacuum high-frequency induction furnace used for high-temperature experiments are described. A 10, 000 cycle per second motorgenerator of 15kVA output was used as the power source. The heating system, including a water-cooled primary coil 20cm in diameter, a heat insulator and a graphite susceptor 12cm in outer diameter, 14cm high, and 2cm in wall thickness, was placed in a stainless steel vacuum vessel (70cm in inner diameter and 60cm in length) having a steel water jacket.Graphite powder of 150-200 mesh/in. was used as the heat insulator. A graphite crucible 8cm in outer diameter and 12cm high, set in the graphite suscepter surrounded with a graphite powder insulating layer of 3cm, could be heated up to 3000°C in two hours using a power input of about 7kW. When the graphite crucible itself was used as the susceptor, the insulating layer was 5cm in thickness and the time of heating up to 3000°C was reduced to about one hour with the same power input. When the temperature of the crucible was raised to 2600°C or above, the vaporization of carbon became so noticeable that the fine particles of carbon blew out from the inside of the crucible and carbon vapor deposited in laminar form on the wall of the hole in the lid of the crucible.
社団法人日本セラミックス協会の論文
1958-10-01