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Metallurgical and Materials Transactions B
Published in: Metallurgical and Materials Transactions B 6/2007

01-12-2007

Electrochemical Deoxidation of Titanium Foam in Molten Calcium Chloride

Authors: Prabhat K. Tripathy, Maxime Gauthier, Derek J. Fray

Published in: Metallurgical and Materials Transactions B | Issue 6/2007

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Abstract

Titanium foam, prepared by using a patented powder-metallurgy–based process involving a powder blend that was molded, foamed, and sintered using a three-step thermal treatment, was deoxidized in a molten CaCl2 bath. The polarization experiments were carried out by cathodically polarizing the foam (working electrode) against a counter (graphite) electrode. Under constant potential (polarization) mode, the dominant mechanism of deoxidation was the ionization of oxygen, present in the foam, and its subsequent discharge, as CO2/CO, at the anode surface. More than ∼85 pct oxygen could be effectively removed by carrying out the electro-deoxidation experiments in fresh and pre-electrolyzed melt(s) at an electrolyte temperature of 950 °C. Scanning electron microscopy–energy dispersive X-ray (SEM-EDX) detection of the deoxidized foams did not show a presence of any inclusion(s) or secondary phase(s).
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Footnotes
1
INCONEL is a trademark of Inco Alloys International, Huntington, WV.
 
2
The oxygen values were measured by using an ELTRA oxygen analyzer, which works on the principle of the conversion of oxygen, in the sample, to carbon monoxide and then quantifying the value (peak output) through the principle of thermal conductivity. Each value was an average value, obtained from two sets of samples, prepared under identical conditions. Also, the measurement was carried out by taking samples from different zones of the deoxygenated foam. Each measurement was carried out by taking ∼100 mg sample.
 
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Metadata
Title
Electrochemical Deoxidation of Titanium Foam in Molten Calcium Chloride
Authors
Prabhat K. Tripathy
Maxime Gauthier
Derek J. Fray
Publication date
01-12-2007
Publisher
Springer US
Published in
Metallurgical and Materials Transactions B / Issue 6/2007
Print ISSN: 1073-5615
Electronic ISSN: 1543-1916
DOI
https://doi.org/10.1007/s11663-007-9094-6

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