| 摘要: |
| 采用热力学研究方法,计算分析了稀土元素Ce与Ag-Cu-Zn系钎料合金中杂质元素Pb、Bi的活度系数与Ce、Pb、Bi浓度的关系。热力学计算表明,在以Ce、Pb或Bi为溶质,Ag、Cu或Zn为溶剂的金属熔体中,溶质元素的活度系数在Ce的某一浓度范围内出现"等活度系数"现象,此时溶质元素的活度系数与溶质元素的浓度无关,这一新的发现表明,热力学研究结果与金属学研究结果完全吻合。 |
| 关键词: 稀土 铈 热力学 活度系数 |
| DOI： |
| 分类号: |
| 基金项目:机械工业人才科技基金(97JF0022) |
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| Thermodynamic Alanysis on Cerium Reacting with Lead or Bismuth in Ag-Cu-Zn Series Brazing Filler Metal |
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XUE Song-bai,QIAN Yi-yu,DONG Jian,WANG Xian-hua
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Harbin Welding Institute, Harbin 150080, China
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| Abstract: |
| The relation between contents of rare earth cerium and impurity lead or bismuth and the activity coefficient of cerium,lead and bismuth in Ag Cu Zn series brazing alloy was calculated and analyzed by means of thermodynamic method.The thermodynamic calculation results show that the "equivalent activity coefficient phenomenon" will emerge among the activity coefficient of solute in a certain range of cerium for the metallic solution in which Ce,Pb or Bi is as solute and Ag,Cu or Zn as solvent respectively.Under this condition,the activity coefficient of solute has nothing to do with its own concentration.The preliminary theory analysis to this new finding has been done in this paper. |
| Key words: rare earths cerium thermodynamics activity coefficient |
