CO_2,H_2O(g)及CO_2-CO混合气体的氧位——兼论Ellingham图应用的扩展

OXYGEN POTENTIALS OF CO_2, H_2,O(g) AND C0_2-CO GAS MIXTURES—WITH EXTENSION OF APPLICATION OF ELLINGHAM DIAGRAM

本文导出CO_2,H_2O(g)以及CO_2-CO混合气体氧位新的表征式。经典表征式是本表征式在氧含量为零时的特例。对影响平衡气氛的因素进行了讨论,指出,对中低温下CO_2和H_2O(g)的分解,忽略氧含量将造成平衡气氛极大的表征误差。本文评论了以CO_2及CO_2-CO混合气体控制氧位的某些实验,给出了CO_2作为固体电解质参比气体时应给出的氧含量校正,并推广Ellinggam图应用于CO_2和H_2O(g)分解所建立的平衡反应。

A new set of formulae representing the oxygen potentials of CO_2, H_2O(g) and CO_2-CO gasmixtures has been derived. Classical representation is only a particular case of it. Some of thevariables affecting equilibrium atmospheres have been discussed. To initial CO_2 or H_2O(g), theneglect of trace oxygen in them would cause the larger representative errors of the equilibrimpressures of oxygen, especially at the range of lower and middle temperatures. Some of theprevious experiments under the oxygen potentials controlled by CO_2 or CO_2-CO gas mixtureshave been criticized. Calibration curves for the oxygen concentration in liquid steel as a functionof EMF when using CO_2 as a reference of solid electrolyte cell were given. And application ofEllingham diagram was extended to pure CO_2, pure H_20(g) and CO_2 and H_2O(g) containing microoxygen.