摘要
由于氮气的逸度-压力关系式存在适用的高压极限,而且不同温度下的高压极限也不同。当压力高于极限值时,需要对氮气逸度表达式进行修正。本文根据氮气的逸度与温度和压力所构成的函数关系,从数学角度提出了文献中报导的氮气逸度与温度和压力的关系式在高低压区段需要分段表达的必要性,给出了高低压区段分界点的确定方法,推导出不同温度下高压区段的氮气逸度表达式。通过对氮气逸度的分段表达,研究了氮气逸度对不同含氮二元系相平衡关系的影响,并给出了相应体系中固-液-气三相平衡条件下的压力-温度优势区相图。
The expression for the nitrogen fugacity reveals a high pressure limit that differs from temperature to temperature.An approach for defining the high and the low pressure regions is proposed.By the topologic characteristics of the literature reported nitrogen fugacity-pressure relation and from the view point of mathematics, the approach for determining the dividing point between the high and low pressure ranges is proposed in this paper. The nitrogen fugacity-pressure relation in the high pressure range is developed for the different N-containing system. On the basis of the study above,the influence of the nitrogen on the phase equilibria of Me-N systems is discussed and the corresponding potential phase diagrams were obtained.
基金
高等学校博士学科点专项基金(20030008016)
国家自然科学基金(50371008).
关键词
相图
氮气逸度
含氮二元系
相平衡
phase diagram
nitrogen fugacity
N-containing binaries
phase equilibrium
