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基合金在液相中存在较大的相容间隙，利用这种相分离，一些Fe-Cu基合金被用作导电和软磁材料，其中细小的富铜相析出在铁基上。Fe-Cu-Si和Fe-Cu-P是这类合金系统的典型例子。铁-铜-硅和铁-铜-磷三元系也是新近发展起来的焚烧灰重熔过程中形成的基本合金体系。此外，了解Fe-Cu体系的热力学性质对于从重熔废钢中脱除铜也是非常重要的。尽管如此，Fe-Cu基三元合金的相图还没有得到很好的确定。本工作的目的是建立Fe-Cu-Si和Fe-Cu-P三元合金的相图和热力学性质。1995年，在1250~1550ﾟC的温度范围内，测定了Fe-Cu-Si系中FeSi化合物、固硅在液相中的溶解度以及两不相容的液相间的连接线。结果表明，所观察到的相平衡与常等人提出的文献相图不同。1996年，用固-液扩散偶技术在1250ﾟC下测定了Fe-Cu-P系中固体铁与富铜熔体之间的连接线。测得的Fe-Cu-P系相平衡也与文献相图不同。在亚规则溶液模型的基础上，对Fe-Cu-Si和Fe-Cu-P系的相图进行了热力学计算。

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。