Process of manufacturing a sintered electrode for use in a volta

Details Process of manufacturing a sintered electrode for use in a volta Process of manufacturing a sintered electrode for use in a volta

1993-07-07

1995-03-14

Walsh, Donald P.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Powder pretreatment

419 30, 419 31, 419 33, B22F 312, B22F 316

Patent

active

053975324

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.

REFERENCES:
patent: 3802878 (1974-04-01), Lindstrom
patent: 4109060 (1978-08-01), Andersson et al.
patent: 4236927 (1980-12-01), Buhl et al.
patent: 4582657 (1986-04-01), Shibata et al.
patent: 5262102 (1993-11-01), Wada
Chemical Abstracts, vol. 83, Nov. 3, 75 No. 18 83:150 317m.

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