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Solubility experiments of Ca in Mn melt were carried out in a Mo-wire-heated furnace. Small CaO crucibles, charged with the Mn alloys with small amount of Ca chips on top, were placed in an iron crucible, its lid being tightly sealed under red-hot conditions. Relation of the solubility of Ca in pure Mn with temperature was formulated between 1 250 and 1 380°C. The effects of 3rd elements upon the solubility of Ca in Mn at 1 350°C were studied. Diagram showing the relation of Ig fjCa with [%j] (j = Si, Cr, Ni, Fe, Al, C and Ca) was drawn and ejCa evaluated. With the formula of Wagner, In γCa0 and εCaCa were found by regression analysis from the experimental data. The standard free energy of solution of Ca in Mn, based on the 1 wt.% standard at 1350°C was calculated, and its relation with T estimated.
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Wei et al. (1989) studied this question.
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