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Article: Electrochemical Deoxidation of Solid Zirconium Dioxide in Molten Calcium Chloride
- Article from:
- Metallurgical and Materials Transactions
- Article date:
- October 1, 2009
- Author:
CopyrightCopyright Minerals, Metals & Materials Society and ASM International Oct 2009. Provided by ProQuest LLC. (Hide copyright information)
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The reduction of zirconium dioxide pellets by electro-deoxidation in molten calcium chloride-calcium oxide (900 °C) has been studied. In this technique, the solid oxide is cathodically polarized against a graphite counter electrode under a constant applied potential. Unlike other metal oxides that have been reduced by this technique, only a small area around the cathodic current-collector wire was reduced to zirconium metal with zirconia pellets sintered at ~1100 °C; the rest of the sample was largely calcium zirconate. Pellets sintered above 1200 °C showed better reduction near the cathode wire and the reduction extended to the entire surface of the pellet with the passage of time. ...