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溶融金属のガス溶解度の理論計算

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川崎製鉄技報 KAWASAKI STEEL GIHO

Vol.3 (1971) No.3

溶融金属のガス溶解度の理論計算

Theoretical Calculation of the Solubility of Gases in Liquid Metals 江見 俊彦(Toshihiko Emi)

要旨 :

水素，窒素，炭素の，鉄，コバルト，ニッケル，銅融体中への溶解度を，液体の状態方程 式の一つであるPercus-Yevick の式の剛体球解（the scaled particle theory）を用いて計算 した。金属原子の剛体球径は，溶融金属の回折データによく合うと報告されている液体構 造因子を満足するパッキングパラメターから決めた。水素原子の剛体球径は，遮敞距離の 関数として求めた。窒素，炭素原子の剛体球径は，それらをとりかこむ最近接金属原子と の間の結合の共有結合性を考慮して推定した。理論式にこの剛体球径を使って計算した溶 解度は，実測値とよく一致した。 Synopsis :

The solubility of hydrogen, nitrogen, and carbon in liquid pure iron, cobalt, nickel, and copper is calculated in terms of a hard sphere version (the sｃaled particle theory) of the Percus-Yevick equation for the liquid state. The hard sphere radius of a metal atom is estimated from the packing density for the liquid structure factor which has been reported to fit satisfactorily with the observed diffraction data for the liquid metals. For a hydrogen atom dissolved in the metals, the hard sphere radius is derived as a function of the screening distance. The radii for nitrogen and carbon atoms in the metals are estimated by taking into account the covalency of the bonding between the solutes and surrounding nearest neighbor metal atoms. Good agreement is obtained between the theoretical predictions and experimental observations.

(c)JFE Steel Corporation, 2003

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