Ce,Y在Fe液中与氮的相互作用

金属学报, 1987, 23(1): 99-102.

Ce,Y在Fe液中与氮的相互作用

冶金工业部钢铁研究总院

THERMODYNAMICAL STUDY OF INTERACTION BETWEEN NITROGEN AND Ce OR Y IN LIQUID IRON

YUE Kexiang DU Ting LI jizong SHEN Rumei (Central Iron and Steel Research Institute , Ministry of Metallurgical Industry , Beijing) , null

<正> 选取 Ce,Y 作为轻、重稀土金属的代表,研究它在 Fe 液中与氮的相互作用的热力学,可能为开发稀土在钢中的应用,提供基础数据.考虑到稀土与 O,S 有很强的亲和力,本研究是在 O,S 含量很低的情况下进行的.实验用 Fe 为99.8%高纯 Fe,Ce 和 Y 的纯度均>99.5%,N 和 Ar 均经过净化处理.用电熔 MgO 坩埚熔化试样,加热至1570,1600和1650℃.在竖管钼丝炉中进行,炉温可控制在±2℃以内。测定氮用熔融脉冲热导法,分析误差约

Equilibria of the Fe-Ce-N and Fe-Y-N melts with very low oxygen and sulphur conte- nts have been investigated at 1570—1650℃.The equilibriun products are examined to be CeN and YN respectively.The temperature dependences on their interaction coefficients are determined to be: e_N~(Ce)=-(6230/T)+2.670;e_(Ce)~N=-(62281/T)+26.64 e_N~Y=-(6640/T)+2.986;e_Y~N=-(41991/T)+18.83 That on denitriding constants are: 1g K_(CeN)~°=-(20960/T)+7.972;1g K_(YN)=-(20440/T)+7.863 That on standard free energy of formation of CeN and YN are: △G_(CeN)~°=-401204+152.59T(J/mol) △G_(YN)~°=-391246+150.50T(J/mol) That on self-interaction coefficients are: e_(Ce)~(Ce)=-(79.92/T)+0.0167;e_Y~Y=-(64.51/T)+0.0142

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