INTERNAL OXIDATION OF Pd-Eu ALLOYS

Acta Metall Sin

1993, Vol. 29

Issue (9): 65-71 DOI:

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INTERNAL OXIDATION OF Pd-Eu ALLOYS

NING Yuantao;WEN Fei;ZHAO Huaizhi;DENG Deguo Kunming Institute of Precious Metals

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NING Yuantao;WEN Fei;ZHAO Huaizhi;DENG Deguo Kunming Institute of Precious Metals. INTERNAL OXIDATION OF Pd-Eu ALLOYS. Acta Metall Sin, 1993, 29(9): 65-71.

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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 words: Palladium alloy Eu additive internal oxidation

Received: 18 September 1993

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