Gaseous reduction of an alloy oxide |
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| Authors: | Jeffrey S Allender Lutgard C De Jonghe |
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| Affiliation: | (1) Savannah River Laboratory, E. I. duPont de Nemours Co. Inc., 29801 Aiken, South Carolina, USA;(2) Materials and Molecular Research Division, Lawrence Berkeley Laboratory, and Department of Materials Science and Mineral Engineering, University of California, 94720 Berkeley, California, USA |
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| Abstract: | Ni(Al, Fe)2O4 ceramic alloys were reduced by hydrogen gas at a pressure of 1 atm, and at temperatures between 450 and 800° C. The reaction
rate was determined from the rate of advance of the porous metal product layer—unreduced oxide interface. A simple analysis
was presented permitting assessment of both the interface reaction resistance and the gas transport resistant through the
porous product scales. The reaction was under mixed control in all conditions studied. In a range of temperatures and reaction
times, preferred grain-boundary attack was observed. The conditions under which this was observed depended strongly on the
Al3+ content of the ceramic alloy. Al3+ also lowered the interface reaction rate and inhibited scale coarsening by formation of dispersed unreduced phases in the
product scales. |
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