Evaluation of Functional Copper-Rare Earth Alloys and Investigation on Potential Diagram of Copper-Rare Earth Oxides

（1）为了解制备无夹杂物的铜基铜-稀土合金的基本情况，在1473-1723 K温度范围内重新研究了Y在与C-YC_2平衡的液态铜中的溶解度。在1473、1573和1673 K下，在石墨坩埚中熔炼了铜和稀土（Y、La、Nd、Gd、Ce和Pr）在溶解极限范围内的合金。将熔体在水中淬火，并分析铜中的RE和碳。由分析结果得到了铜液中稀土与碳的相互作用参数ε。用TG和DTA研究了Sm_2O_3-Cu_xO体系在0.01，0.21和1.0atm氧分压下的相图，发现相互作用参数ε^Y_C=-41.0，<La>ε ^_C =-64.5，ε^ _<Nd>C=-61.1，ε^ _<Gd>C=-58.7，ε <Pr>^ _C=-27.3与温度的倒数呈线性关系<Ce>，ε^<Ce>_C=20.5-15.7×10^4/T3。从结果中，确定了相关系，以及相变的温度和组成。

1)To understand the fundamental aspects of the preparation of copper based Cu- rare earth alloys without any inclusions, the solubility of Y in the liquid copper in equilibrium with C-YC_2 was reinvestigated in the temperature range of 1473-1723 K. The logarithm of the solubility of Y is represented as a function of the temperature by the relations ;log(mass%Y)=1.453-1073/T2)Copper and RE (Y,La,Nd,Gd,Ce and Pr) within the solubility limit was melted in a graphite crucible at 1473,1573 and 1673 K. The melt was quenched in water, and RE and carbon in copper were analyzed. From the analytical values, the interaction parameter(ε) between RE and carbon in liquid copper was obtained. Temperature dependencies of the interaction parameter were not found for Y,La,Nd,Gd and Pr.ε^Y_C=-41.0,ε^<La>_C=-64.5,ε^<Nd>_C=-61.1,ε^<Gd>_C=-58.7,ε^<Pr>_C=-27.3On the other hand, linear relation was obtained between ε^<Ce>_C and reciprocal of temperature.ε^<Ce>_C=20.5-15.7×10^4/T3)Phase diagram of the system Sm_2O_3-Cu_xO was investigated using TG and DTA under the oxygen partial pressures of 0.01,0.21 and 1.0 atm. From the results, phase relations, and temperature and composition of phase transformations were determined.