Phase Equilibria on Fe-Cu Based Alloys Used for Electrically Conductive Materials

导电材料用铁铜基合金的相平衡

• 批准号: 07650864
• 负责人: NAGASAKA Tetsuya
• 金额: $ 1.6万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650864/
• 关键词: Phase diagram; Fe-Cu alloy; Thermodynamic assessment; Fe-Cu-Si alloy; Fe-Cu-P alloy; Electrically conductive material; Phase equilibria; Thermodynamics

It is known that many Fe-Cu based alloys have wide miscibility gap in liquid phase, and by utilizing such phase separation some Fe-Cu based alloys are used as an electrically conductive and a soft-magnetic materials in which fine Cu-rich phase precipitates on iron matrix. Fe-Cu-Si and Fe-Cu-P are typical examples of such alloy systems. Fe-Cu-Si and Fe-Cu-P ternaries are also basic alloy systems formed in the remelting process of incinerated ash which is recently being developed. Moreover, it is important to understand thermodynamic properties of Fe-Cu system to remove copper from remelted steel scrap. In spite of such importance, phase diagrams of Fe-Cu based ternary alloys are not well established. The objective of the present work is to establish phase diagrams and thermodynamic properties of Fe-Cu-Si and Fe-Cu-P ternary alloys. In 1995, solubility of FeSi compound, solid Si in liquid phase and tie lines between two immiscible liquid phases in Fe-Cu-Si system have been measured in the temperature range from 1250ﾟC to 1550ﾟC.As the results, observed phase equilibria differed from the literature phase diagram proposed by Chang et al. In 1996, tie lines between solid iron and copper-rich melt in Fe-Cu-P system were determined at 1250ﾟC by solid-liquid diffusion couple technique. Measured phase equilibria of Fe-Cu-P system also differed from the literature phase diagram. Phase diagrams of Fe-Cu-Si and Fe-Cu-P systems were thermodynamically assessed based on the sub-regular solution model.

众所周知，许多Fe-Cu基合金在液相中具有宽的混溶间隙，并且通过利用这种相分离，一些Fe-Cu基合金被用作导电材料和软磁材料，其中沉淀出细小的富Cu相。 Fe-Cu-Si和Fe-Cu-P是这类合金系的典型例子，Fe-Cu-Si和Fe-Cu-P三元系也是焚烧灰重熔过程中形成的基本合金系。此外，了解 Fe-Cu 系统的热力学特性对于从重熔废钢中去除铜非常重要，但 Fe-Cu 基三元合金的相图尚未明确。目前的工作是建立Fe-Cu-Si和Fe-Cu-P三元合金的相图和热力学性质。1995年，FeSi化合物的溶解度、固态Si在液相中以及两种不混溶液体之间的连接线。 Fe-Cu-Si 体系中的相在 1250°C 至 1550°C 的温度范围内进行了测量。结果，观察到的相平衡与 Chang 等人 1996 年提出的文献相图不同。采用固液扩散耦合技术测定了1250℃下Fe-Cu-P体系中的铁和富铜熔体，并测量了Fe-Cu-P体系的相平衡。与文献相图不同，Fe-Cu-Si 和 Fe-Cu-P 体系的相图是基于次规则溶液模型进行热力学评估的。

项目成果

長坂徹也: "Fe-Cu-P系合金の相平衡" 材料とプロセス. 8. 1025 (1995)

Tetsuya Nagasaka：“Fe-Cu-P 合金的相平衡”材料和工艺。8. 1025 (1995)。

M.Hino: "Activity of Phosphorus in alpha-Fe and Phase Diagram of Fe-P Binary System Above 1273K" Zeitschurift fur Metallkunde 88. (in press). (1997)

M.Hino：“α-Fe 中磷的活性和 1273K 以上 Fe-P 二元系统的相图”Zeitschurift Fur Metallkunde 88。（印刷中）。

長坂徹也: "Fe-Cu-P系合金の相平衡" 材料とプロセス. 8. 1025-1025 (1995)

Tetsuya Nagasaka：“Fe-Cu-P 合金的相平衡”材料和工艺 8. 1025-1025 (1995)。

T.Nagasaka: "Fundamental Studies on the Removal of Cu, Sn and Zn from Remelted Steel Scrap" Steelmaking Conference Proceedings. 79. 589-597 (1996)

T.Nagasaka：“从重熔废钢中去除铜、锡和锌的基础研究”炼钢会议论文集。

M.Hino: "Fundamental Studies on Separation of Residual Elements from Steel Scrap" The Iron and Steel Institute of Japan. 307. (1996)

M.Hino：“从废钢中分离残余元素的基础研究”日本钢铁研究所。