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Fundamental Study on the Production of Copper-Rare Earth Alloys and Oxides

铜稀土合金及氧化物生产基础研究

基本信息

批准号：
09650816
负责人：
OISHI Toshio
金额：
$ 1.86万
依托单位：
Kansai University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650816/
关键词：
rare earth carbide copper-rare earth alloy thermodynamics solubility oxygen potential phase equilibrium zirconia solid electrolyte copper-rare earth oxide 希土類

项目摘要

1) To understand the fundamental aspects of the preparation of copper based Cu-rare earth alloys without any inclusions, the solubilities of La, Nd, Sm, Ce, Y and Gd in the liquid copper in equilibrium with C-LaC_2, C-NdC_2, C-SmC_2, C-CeC_2, C-YC_2 and C-GdC_2 were determined.The logarithm of the solubility of the rare-earths is represented as a function of the temperature by the relations ;log(mass%La) = 0.476 + 2.17x10^<-4>T (1623-1873 K)log(mass%Nd) = 0.4924 + 2.98x10^<-4>T (1523-1775 K)log(mass%Sm) = 2.65-5.22x10^3/T + 3.89x10^6T^2(1530-1781 K)log(mass%Ce) = 0.424 + 3.59x10^<-4>T (1623-1773 K)log(mass%Y) = 1.343 + 767.2/T (1523-1723 K)log(mass%Gd) = 0.649 + 2.85x10^<-4>T (1573-1773 K)2) The isothermal phase relations of the solid Cu-La-O, Cu-Nd-O and Cu-Gd-O systems were established by powder X-ray diffractometry of the quenched samples. The formation of ternary oxides La_2CuO_4 and LaCuO_2 in the Cu-La-O system, Nd_2CuO_4 and NdCuO_2 in the Cu-Nd-O system, and only GdCuO_2 in the Cu-Gd-O system were confirmed. Equilibrium oxygen partial pressures corresponding to three-phase equilibria involving condensed phases in each Cu-RE-O system was obtained by EMF measurements using zirconia solid electrolyte. From the results, the regions of the temperature and the oxygen partial pressure where the complex oxides exist as the stable phases were determined.3) Phase diagram of the system Cu_xO-Gd_2O_3 under p_<o2> = 0.21 was determined by DTA(Differential Thermal Analysis) and TG(Thermal Gravimetry).

1) 为了了解无夹杂物铜基铜稀土合金制备的基本原理，测定了La、Nd、Sm、Ce、Y和Gd在与C-LaC_2、C-NdC_2、C-SmC_2、C-CeC_2、C-YC_2和C-GdC_2平衡的液态铜中的溶解度。稀土元素通过以下关系表示为温度的函数：log(mass%La) = 0.476 + 2.17x10^<-4>T (1623-1873 K)log(mass%Nd) = 0.4924 + 2.98x10^<-4>T (1523-1775 K)log(mass%Sm) = 2.65-5.22x10^3/T + 3.89x10^6T^2(1530-1781 K)log(质量%Ce) = 0.424 + 3.59x10^<-4>T (1623-1773 K)log(质量%Y) = 1.343 + 767.2/T (1523-1723 K)log(质量%Gd) = 0.649 + 2.85x10^<-4>T (1573-1773 K)2) 通过淬火样品的粉末 X 射线衍射法建立了固体 Cu-La-O、Cu-Nd-O 和 Cu-Gd-O 体系的等温相关系。 Cu-La-O体系中确认了三元氧化物La_2CuO_4和LaCuO_2的形成，Cu-Nd-O体系中确认了Nd_2CuO_4和NdCuO_2的形成，而Cu-Gd-O体系中仅确认了GdCuO_2的形成。通过使用氧化锆固体电解质进行 EMF 测量，获得了与每个 Cu-RE-O 系统中涉及凝聚相的三相平衡相对应的平衡氧分压。由此确定了复合氧化物作为稳定相存在的温度范围和氧分压范围。3)通过差热分析(DTA)和热重分析(TG)测定了Cu_xO-Gd_2O_3体系在p_<o2>=0.21条件下的相图。