Solubility of Nitrogen Gas into Molten Copper at Temperature Range of 1,993 K to 2,443 K

Abstract

AbstractSolubility of nitrogen gas into pure copper at temperature range of 1,993–2,443 K was studied with using a levitation melting apparatus. The solubility which was dissolved content of nitrogen equilibrated with nitrogen gas with a pressure of 101.3 kPa increased with the temperature of molten copper. However, the solubility was approximately 1.5 mass ppm even at 2,443 K. Absorption of nitrogen gas into pure copper obeyed the Sieverts’ law and was expressed as: $${1 \over 2}{{\rm{N}}_2}\left({{\rm{gas}}} \right) = \underline {\rm N} $$Here, the underlined element was expressed as the element dissolved into a molten copper. The relation between this reaction Gibbs energy, ${\Delta _{\rm{r}}}{G^0}$ [J], and thermodynamic temperature of the molten copper, T [K], was given as: $${\Delta _{\rm{r}}}{G^0} = 61573 + 48.75T$$