Thermodynamics of Copper Dissolution into MnO-SiO_2-MnS Inclusion System
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概要
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Recently, a new process has been introduced to control α–γ transformation of steels using cuprous sulfide precipitates on the MnO bearing oxide inclusion as well as MnS. In order to optimize the composition of inclusions, the solubility of copper into MnO–SiO2–MnS system were measured at 1523 K and a dissolution mechanism of copper into an oxy-sulfide melts and cuprous sulfide capacity has been proposed. The solubility of copper increased with an increase in MnO/(MnO+SiO2) ratio and showed a maximum solubility at MnO and MnS doubly saturated composition, which was consistent with the maximum precipitation ratio of CuS. Deliberating an oxy-sulfide melts saturated with MnS, MnO, and SiO2 at 1523 K, the phase diagram for the MnO–SiO2–MnS system indicated that the activity coefficient of cuprous sulfide in an oxy-sulfide melts was dependent on the activity of MnO and the activity coefficient of MnS. The dissolution mechanism of copper into a MnO–MnS inclusion system was confirmed and cuprous sulfide capacity was also defined from the reaction mechanism. Cuprous sulfide capacity for the MnO–MnS bearing inclusion strongly depends on stability of sulfide and basicity. The experimental results revealed that the optimized composition for inclusion to dissolve copper was (mass%MnO)=43.6, (mass%SiO2)=1.8 and (mass%MnS)=54.6. Consequently, it could be proposed that the harmlessness of copper in scrap and dispersion strengthening could be possible by using the non-metallic inclusion technique.
- 社団法人 日本鉄鋼協会の論文
- 2009-02-15
著者
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Park Jin
Department of Internal Medicine, Sejong General Hospital
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Park Joo
School of Materials Science and Engineering, University of Ulsan
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Lee Young
Technical Research Laboratories, POSCO
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Jung Sung
Graduate Institute of Ferrous Technology (GIFT), Pohang University of Science and Technology (POSTEC
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Min Dong
Department of Metallurgical Engineering, Yonsei University
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Lee Y
Department Of Metallurgical Engineering Yonsei University
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Jung Sung
Graduate School Of Iron And Steel Technology Pohang University Of Science And Technology
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Park Jin
Department Of Biochemistry Medical School Chonbuk National University
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Min D
Yonsei Univ. Seoul Kor
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Min Dong
Department Of Metallurgical Engineering Yonsei University
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Park Joo
School Of Materials Science And Engineering University Of Ulsan
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Jung Sung
Graduate Institute Of Ferrous Technology (gift) Pohang University Of Science And Technology (postech
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Lee Young
Technical Research Laboratories Posco
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Lee Young
Ironmaking Research Group Technical Research Laboratories Posco
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Park Jin
Department Of Anatomy Ajou University School Of Medicine
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Park Jin
Department Of Metallurgical Engineering Yonsei University
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Park Joo
School Of Materials Sci. And Engineering Univ. Of Ulsan
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Min Dong
Department Of Materials Science And Engineering Yonsei University
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MIN Dong
Department of Advanced Materials Engineering, Yonsei University
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Park Jin
Department of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon, Gyeonggi 440-746, Republic of Korea
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