Process of manufacturing a sintered electrode for use in a voltaic cell comprising reducing FB.sub.2 O.sub.3 to FE powder and adding a fugitive organic expanding agent
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United States of America Patent
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Mar 14, 1995
Grant Date -
N/A
app pub date -
Jul 7, 1993
filing date -
Jul 10, 1992
priority date (Note) -
Expired
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Abstract
A sintered electrode having fine pores and coarse pores and intended for use in a voltaic cell is made from reduced iron powder granules, which have been made from an iron(III) oxide powder having a particle size up to 10 micrometers and have a particle size not in excess of 500 micrometers and are compacted to form an electrode body, which is sintered under a reducing atmosphere at a sintering temperature up to 750.degree. C. The iron powder granules are derived from the agglomerated iron powder that is formed as the iron powder is reduced at 600.degree. to 800.degree. C. and optionally after the agglomerated iron powder has been reduced in size, and the iron powder granules before being compacted are mixed with an organic solid expanding agent, which volatilizes during the sintering process and is used in such a proportion and has such a particle size that the resulting sintered electrode has coarse pores in the desired number and the desired size.
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