Process for the production of K- or Rb-.beta."- or -.beta.- alum

Details Process for the production of K- or Rb-.beta."- or -.beta.- alum Process for the production of K- or Rb-.beta."- or -.beta.- alum

1994-03-28

1995-12-12

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Aluminum compound containing

501127, 264299, 264319, 423625, C04B 35113

Patent

active

054749590

ABSTRACT:
The present invention provides a process for the production of a K- or Rb-.beta."- or -.beta.-aluminum oxide powder preparation, wherein a cubic densely packed aluminum oxide (.gamma.-aluminum oxide) or a precursor thereof is subjected to attrition together with a doping material or a precursor thereof, the so obtained mixture is calcined in an oxygen-containing atmosphere, potassium oxide or rubidium oxide or a precursor of these compounds is added to the calcination product obtained, the mixture is subjected to attrition and then calcined in an oxygen-containing atmosphere at a temperature greater than 900.degree. C. The present invention also provides a process for the production of a ceramic formed body in which a powder obtained by the above process is converted by attrition, isostatic pressing and sintering into a ceramic formed body. Such a ceramic formed body can be used as an ion conductor.

REFERENCES:
patent: 3707589 (1972-12-01), Chiku et al.
patent: 4792377 (1988-12-01), Dunn et al.
patent: 4937214 (1990-06-01), Morita et al.
patent: 4946664 (1990-08-01), Van Zyl et al.
Crosbie et al., "Potassium Beta"-Alumina Membranes"; Jour. Amer. Cer. Soc., ol. 65, No. 4; Apr. 1982, pp. 187-191.
Park et al., "Na to K vapor-phase exchange in polycrystalline .beta."-alumina"; Solid State Ionics, 46; Feb. 1991, pp. 221-231.
Yang, "Thermal Stability of Multivalent Ion-Exchanged Beta" Aluminas", Doctorate Dissertation, UCLA; no month 1988, pp. 1-86.

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