金属学报  1982, Vol. 18 Issue (4): 411-417

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液态铌基合金中合金元素挥发过程动力学的研究

杨克努;孙从熙;呼格吉夫

中国科学院金属研究所;中国科学院金属研究所;中国科学院金属研究所

KINETICS OF THE EVAPORATION PROCESS OF ALLOY ELEMENTS IN LIQUID Nb ALLOYS

Yang Kenu Sun Congxi Hogjihu (Institute of Metal Research; Academia Sinica; Shenyang) (Manuscript received 13 February; 1981)

杨克努;孙从熙;呼格吉夫. 液态铌基合金中合金元素挥发过程动力学的研究[J]. 金属学报, 1982, 18(4): 411-417.
, , . KINETICS OF THE EVAPORATION PROCESS OF ALLOY ELEMENTS IN LIQUID Nb ALLOYS[J]. Acta Metall Sin, 1982, 18(4): 411-417.

摘要 参考文献 相关文章 Metrics 全文: PDF(581 KB)   摘要: 本文介绍了用“锭块熔化法”测定液态Nb,Nb-W与Nb-w-Zr合金在3000-3600℃时合金元素的挥发速率和用电子探针测定合金液表面扩散边界层内合金元素分布的结果,给出了各合金元素的活度系数值。实验结果表明,Nb自Nb-W-Zr合金中挥发过程的激活能为175.9kcal/mol,Nb自Nb-W与Nb-W-Zr中挥发的速率控制阶段为Nb原子自合金液表面脱离的蒸发过程;Zr自Nb-W-Zr中的挥发为混合速率控制阶段;W自Nb-W与Nb-W-Zr中挥发主要为扩散所控制。 Abstract：The evaporating rates of alloy elements from melts of Nb, Nb-W or Nb-W-Zr alloy at 3000-3600℃ have been examined by“melting ingot block”method. The activation energy of evaporation of Nb from Nb-W-Zr melt was obtained to be 175.9 kcal/mol. The rate-controlling step of the evaporation of Nb from Nb-W or Nb-W-Zr alloy is the detachment of Nb atoms from the liquid alloy surface, whereas the evaporation of Zr from Nb-W-Zr alloy seems to be a complex process. The evaporating rate of W from both Nb-W and Nb-W-Zr alloys, however, is controlled mainly by diffusion. The distribution of the alloy elements in the surface diffusion layer of quenched alloy melts has been determined by EPMA. It is measured that the thickness of diffusion boundary layer of Zr in liquid Nb-W-Zr alloy is 5.5—13.5×10~(-4)cm at 3080℃, and the concentration of Zr at surface is about 20% of that in bulk; the thickness of W diffusiin boundary layer is about 7—10×10~(-4) and 4—10×10~(-4)cm at 3120 and 3080℃ respectively, and the Wconcentration at surface is only 10% of that in bulk. A tentative estimation has also been made on the activity of coefficient of Nb or Zr. At 3000—3280℃ the activity of Nb in the Nb-W alloy is roughly equal to l. However, in the case of Nb-W-Zr alloy the Nb activity is much smaller, being 0.24 at 3600℃ and 0.17 at 3350℃. The apparent activity coefficient of Zr in Nb-W-Zr alloy is 0.16—0.31 at 3350℃ and 0.16—0.22 at 3600℃. 收稿日期: 1982-04-18      服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 杨克努 孙从熙 呼格吉夫 44.8K 链接本文: https://www.ams.org.cn/CN/      或      https://www.ams.org.cn/CN/Y1982/V18/I4/411 1 金属研究所难熔金属文集编辑组,难熔金属文集,第一分册,1976,p.121． 2 Foster, J.S.; Pfeifer, W.H., J. Vac. Sci. Technol., 9(1972) , 1379． 3 #12 4 Hultgren, R.; Desai, P.D.; Hawkins, D.T.; Gleiser, M.; Kelley, K.K.; Wagman, D.D., Selected Values of the Thermodynamic Properties of the Elements, ASM, 1973, p. 339, 579． 5 Koch, R.K.; Anable, W.E.; Beall, R.A., RI-7125, 1968． 6 #12 7 魏寿昆,活度在冶金物理化学中的应用,中国工业出版社,1964,pp.1-10． No related articles found! Viewed Full text Abstract Cited   Shared      Discussed