PLASMA TORCHES
The limitation that molecular dissociation sets on the temperatures achievable through combustion can be circumvented by using electrical heating methods. This was done in welding arcs, but the electrodes required for such discharges imposed many limitations. These were overcome in part by the d-c plasma torch, essentially an arc discharge with a hole cut in one of the electrodes. This radiofrequency electrodeless discharge operating with argon gas can reach temperatures above 20000 deg K with outputs of several kilowatts. Both 2.5- and 10-kw generators operating at a standard induction-heating frequency of 4 megacycles were used; over half of the power supplied ends up in the plasma. Applications include growing crystals, spraying coatings, spectroscopy, and high- temperature chemistry. (auth)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-16-019256
- OSTI ID:
- 4817921
- Journal Information:
- Intern. Sci. and Technol., Vol. Vol: No. 6; Other Information: Orig. Receipt Date: 31-DEC-62
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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