Method of preparing dense, high strength, and electrically condu

Details Method of preparing dense, high strength, and electrically condu Method of preparing dense, high strength, and electrically condu

1977-04-18

1978-09-12

Walton, Donald L.

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Include electrolyte chemically specified and method

264 57, H01M 618

Patent

active

041139283

ABSTRACT:
Methods of preparing a dense and strong polycrystalline .beta."-alumina-containing ceramic body exhibiting an electrical resistivity for sodium ion conduction at 300.degree. C of 9 ohm-cm or lower obtained directly after sintering and having a controlled fine microstructure exhibiting a uniform grain size under 50 micrometers. The invention more particularly relates to methods of uniformly distributing selected metal ions having a valence not greater than 2, e.g. lithium or magnesium, uniformly throughout the beta-type alumina composition prior to sintering to form .beta."-alumina. This uniform distribution allows more complete conversion of .beta.-alumina to .beta."-alumina during sintering. As a result, the polycrystalline .beta."-alumina containing ceramic bodies obtained by methods of this invention exhibit high density, low porosity, high strength, fine grain size (i.e. no grains over 25-50 micrometers with an average size under 5-10 micrometers), low electrical resistivity and a high resistance to degradation by water vapor in an ambient atmosphere.

REFERENCES:
patent: 3535163 (1970-10-01), Dzieciuch
patent: 3895963 (1975-07-01), McGowan et al.
patent: 3901733 (1975-08-01), Toy et al.
patent: 3903225 (1975-09-01), Jones et al.
patent: 3950463 (1976-04-01), Jones

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