Interface stability during displacement reactions between Cu(2)O and Co(1-x)Fe(x) alloys at 1223K

Interface stability during displacement reactions between Cu(2)O and Co(1-x)Fe(x) alloys at 1223K

The stability of the reactive interface during the solid-state displacement reaction, Cu2O + Co1-XFeX = 2Cu + (Co1-XFeX)O, is studied as a function of Co-Fe alloy composition at 1223 K. For X = 0.03, the reaction zone has a layered structure, and the cation diffusion in (Co, Fe)O is the rate-limitin...

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Veröffentlicht in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2002-09, Vol.33 (9), p.2899-2906
Hauptverfasser: Reddy, S N S, Wiggins, L B
Format: Artikel
Sprache:eng
Schlagworte:
Cobalt
Copper
Metallurgy
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Zusammenfassung:The stability of the reactive interface during the solid-state displacement reaction, Cu2O + Co1-XFeX = 2Cu + (Co1-XFeX)O, is studied as a function of Co-Fe alloy composition at 1223 K. For X = 0.03, the reaction zone has a layered structure, and the cation diffusion in (Co, Fe)O is the rate-limiting step. The transition to interface instability occurs when the oxide can support a cation flux that exceeds the maximum possible oxygen flux in copper. During the reaction, composition gradients develop in (Co, Fe)O because of higher diffusion rates for iron than for cobalt.
ISSN:1073-5623
1543-1940