物理化学学报 >> 1999, Vol. 15 >> Issue (03): 228-233.doi: 10.3866/PKU.WHXB19990307

研究论文 上一篇    下一篇

高纯铌的脱氧热力学特性

刘胜峰, 林建华, 苏勉曾   

  1. 北京大学化学与分子工程学院,稀土材料化学剂应用国家重点实验室,北京 100871
  • 收稿日期:1998-05-20 修回日期:1998-09-10 发布日期:1999-03-15
  • 通讯作者: 刘胜峰

Thermodynamics of Deoxidation of High Purity Niobium

Liu Sheng-Feng, Lin Jian-Hua, Su Mian-Zeng   

  1. State Key Laboratory of Rare Earth Materials Chemistry and Application,College of Chemistry and Molecular Engineering,Peking University,Beijing 100871
  • Received:1998-05-20 Revised:1998-09-10 Published:1999-03-15
  • Contact: Liu Sheng-Feng

摘要:

在 973- 1 473K温度范围内 ,测定了铌与Ca-CaO和与Mg-MgO共存时铌金属中氧的平衡浓度 .得出并讨论了铌中的氧溶解反应的Gibbs自由能表达式和氧分压-温度-成分 (p-t-x)关系表达式 .

关键词: 铌的除氧, 热力学, Gibbs自由能, 高纯铌

Abstract:

Starting niobium samples with different oxygen contents were produced by arc melting and electron beam melting respectively. The equilibrium oxygen contents of the niobium metal have been measured in the temperature range of 1173-1473K for Ca-CaO-Nb and of 973 and1173K for Mg-MgO-Nb by an inert gas fusion infrared absorption method. The equilibrium oxygen contents in Nb increases with temperature, which is independent of oxygen concentration of the starting Nb samples. Based on the equilibrium oxygen contents, the Gibbs free energy of the oxygen dissolution in niobium metal, as well as the expressions of oxygen pressure temperature component ( p t x ) for theses two equilibrium systems were obtained. The acquired free energy values a less than that reported in the literature. This difference is mainly attributed to the adoption of different standard formation free energy of CaO.

Key words: Deoxidation of niobium, Thermodynamics, Gibbs free energy, High purity niobium