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金属学报  1993, Vol. 29 Issue (9): 65-71    
  论文 本期目录 | 过刊浏览 |
Pd—Eu合金内氧化
宁远涛;文飞;赵怀志;邓德国
昆明贵金属研究所;昆明贵金属研究所;昆明贵金属研究所;昆明贵金属研究所
INTERNAL OXIDATION OF Pd-Eu ALLOYS
NING Yuantao;WEN Fei;ZHAO Huaizhi;DENG Deguo Kunming Institute of Precious Metals
引用本文:

宁远涛;文飞;赵怀志;邓德国. Pd—Eu合金内氧化[J]. 金属学报, 1993, 29(9): 65-71.
, , , . INTERNAL OXIDATION OF Pd-Eu ALLOYS[J]. Acta Metall Sin, 1993, 29(9): 65-71.

全文: PDF(2590 KB)  
摘要: Pd—Eu合金在氧化性气氛中退火时,活性溶质Eu发生内氧化,形成稳定氧化物Eu_2O_3内氧化是由扩散机制控制的Eu_2O_3形核长大过程:氧通过体扩散和晶界扩散进入合金内,Eu由内层扩散到外层研究了内氧化动力学对于圆截面试样,内氧化层深度(ξ)与氧化时间(t)满足公式ξ=Kt~n当温度800—900℃时,n=0.5,符合抛物线规律;当温度高达1200℃时,n=0.75,偏离抛物线规律PdEu0.56合金在800—1200℃内氧化激活能为150kJ/mol
关键词 内氧化钯基合金Eu添加剂    
Abstract:The internal oxidation of active solute Eu in Pd-Eu alloys has been studied inair at 800--1200℃. It was a nucleation and growing process of stable oxide Eu_2O_3 controlledby diffusion mechanism: oxygen entered to internal layer and Eu diffused towards outer layerand surface through bulk and grain boundary diffusion, this caused non-homogeneous dis-tribution of oxygen and Eu. For wire samples with dia. 2mm, the dependence of the internaloxidation depth (ξ) on the reaction time (t) could be expressed as ξ= Kt~n, here n=0.5 at 800--900℃, and n=0.75 at 1200℃. The activation energy of Pd-0.56at.-%Eu alloy was deter-mined to be 150 kJ/mol.
Key wordsPalladium alloy    Eu additive    internal oxidation
收稿日期: 1993-09-18     
基金资助:国家自然科学基金
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