Electric heating – Metal heating – By arc
Patent
1994-08-30
1996-05-28
Paschall, Mark H.
Electric heating
Metal heating
By arc
21912143, 21912151, 156345, 427230, 427237, 427238, 118723R, 118733, B23K 1000
Patent
active
055213510
ABSTRACT:
A plasma is generated within the interior of a hollow form held within a vacuum chamber enclosure by utilizing a radio frequency coil mounted within the vacuum chamber and defining a working volume which closely conforms to the shape of the hollow form. The hollow form and the interior of the vacuum chamber are evacuated to a low pressure, and a gas is introduced into the interior of the hollow form to maintain the pressure within the form higher than the pressure in the vacuum chamber outside of the form. Radio frequency electrical power is supplied to the coil to induce an electric field within the form which is sufficient to break down the gas within the form to form a plasma at the pressure of the gas within the form, but does not break down the gas at the lower pressure in the vacuum chamber outside of the hollow form. The interior of hollow forms having complex shapes can be treated using two or more coils arranged to treat distinct portions of the form, and the shape of the coils and the manner in which power is supplied to the coils can be selected to control the spatial distribution of the plasma within the hollow form.
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Paschall Mark H.
Wisconsin Alumni Research Foundation
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