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| EQUILIBRIA OF Ce-Al-O AND Nd-Al-O IN MOLTEN IRON |
| DIAO Shusheng; HAN Qiyong; LIN Gang; CHEN Dong (Beijing University of Iron and Steel Technology) |
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Cite this article:
DIAO Shusheng; HAN Qiyong; LIN Gang; CHEN Dong (Beijing University of Iron and Steel Technology). EQUILIBRIA OF Ce-Al-O AND Nd-Al-O IN MOLTEN IRON. Acta Metall Sin, 1986, 22(2): 51-60.
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Abstract Equilibrium of Ce-Al-O or Nd-Al-O system in molten iron was studied by separately smelting the radioactive isotope of ~(141)Ce or ~(147)Nd in an Al_2O_3 crucible filled with pure iron to form ~(141)CeAlO_3 or ~(147)NdAlO_3 around its inner wall. The content of dissolved Ce or Nd in iron was determined by means of radioassay and electrolysis in organic electrolyte. The analysis of dissolved Al in iron was obtained by colorimetry and followed by calculation. The activity of oxygen as dissolved state in liquid iron was directly measured by solid electrolyte sensors made of ZrO_2(MgO) tube. By extrapolation of data obtained, the temperature dependence of equilibrium constant of RE-Al-O in molten iron, K_(REAlO_3) or of interaction coefficient, e_(RE)~(Al), may be described as: For reaction CeAlO_(3(s)=[Ce]+[Al]+3[O] lg K_(CeAlO_3)=-37900/T+5.84 △G_(CeAlO_3)~0=175400-26.7T cal/mol e_(Ce)~(Al)=20500/T-13.53 For reaction NdAlO_(3(s)) =[Nd]+[Al]+3[O] lg K_(NdAlO_3)=-24700/T+0.69 △G_(NdAlO_3)~0=113030-3.16T cal/mol e_(Nd)~(Al)=13500/T-9.33
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Received: 18 February 1986
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