Compositions: ceramic – Ceramic compositions – Aluminum compound containing
Patent
1998-01-02
2000-09-12
Marcheschi, Michael
Compositions: ceramic
Ceramic compositions
Aluminum compound containing
501127, 501105, 501126, 501152, 428689, 264 82, 264681, 264646, 429320, 429321, 4292319, 42923195, C04B 3501, C04B 3510, C04B 35113
Patent
active
061178071
ABSTRACT:
A ceramic composite containing alkali-metal-.beta.- or .beta."-alumina and an oxygen-ion conductor is fabricated by converting .alpha.-alumina to alkali-metal-.beta.- or .beta."-alumina. A ceramic composite with continuous phases of .alpha.-alumina and the oxygen-ion conducting ceramic, such as zirconia, is exposed to a vapor containing an alkali-metal oxide, such as an oxide of sodium or potassium. Alkali metal ions diffuse through alkali-metal-.beta.- or .beta."-alumina converted from .alpha.-alumina and oxygen ions diffuse through the oxygen-ion conducting ceramic to a reaction front where .alpha.-alumina is converted to alkali-metal-.beta.- or .beta."-alumina. A stabilizer for alkali-metal-.beta."-alumina is preferably introduced into the .alpha.-alumina/oxygen-ion conductor composite or introduced into the vapor used to convert the .alpha.-alumina to an alkali-metal-.beta."-alumina.
REFERENCES:
patent: 3655845 (1972-04-01), Chiku
patent: 3707589 (1972-12-01), Chiku et al.
patent: 4263381 (1981-04-01), McEntire et al.
patent: 4294898 (1981-10-01), Hartstein
patent: 4358516 (1982-11-01), Lange
patent: 5137853 (1992-08-01), Ichikawa et al.
patent: 5415127 (1995-05-01), Nicholson et al.
Youngblood, et al., "Sintering Processes and Heat Treatment Schedules for Conductive, Lithia-Stablized .beta."AL.sub.2 O.sub.3 ", Bull. AM. Ceram. Soc., 1997, 56, 206 (no month).
Battles, "Materials for Advanced High Temperature Secondary Batteries" International Materials REviews, 34, 1 (no month).
Aichun Tan, et al. in "Formation and characterization of Na-.beta."-alumina single crystal films" Solid State Ionics 1993, 67 (no month).
Grosbie, et al. "Potassium Beta"-Alumina Membranes" Journal of the American Ceramic Society, 65, 187 (no month).
Fung Kuan-Zong
Jue Jan-Fong
Virkar Anil Vasudeo
Marcheschi Michael
Materials and Systems Research, Inc.
Sonntag James L.
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