Abstract
The concept “chemical vacuum” is discussed, as applied to the carbon deoxidation of metallic melts. Melting in an argon atmosphere, which is chemical vacuum for the reaction of carbon-oxygen interaction in a metallic melt, is shown not to be equivalent to melting in physical vacuum. For melting in an argon atmosphere, the total gas-phase pressure over a melt is important, and the fact that an unmixed gas layer is likely to exist over the molten metal surface should be taken into account. The CO content in this layer is determined by the carbon and oxygen contents in the melt.
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