Compositions: ceramic – Ceramic compositions – Refractory
Patent
1991-12-16
1993-01-12
Group, Karl
Compositions: ceramic
Ceramic compositions
Refractory
501 1, 501 6, 501 94, 428328, 428330, C04B 3516, C04B 3502, C04B 3518, B32B 516
Patent
active
051790513
ABSTRACT:
This invention relates to a process for preparing a lithium containing ceramic article. The process provides a ceramic article that is substantially crack free and has as its principal crystalline phase a beta-eucryptite phase, a beta-spodumene phase, or a mixture thereof. The process comprises calcining a powder of a lithium-exchanged zeolite up to its collapse temperature for a time sufficient to collapse the zeolite framework and provide an amorphous powder. The amorphous powder is now formed into a shaped article and sintered at a temperature of about 700.degree. to about 1150.degree. C. for a time of about 1 to about 12 hours. The zeolites which can be used are those having a SiO.sub.2 Al.sub.2 O.sub.3 ratio of about 2 to about 8.5 and include zeolite B, zeolite ZK-19, zeolite W, phillipsite, hormotome, gismondine and mixtures thereof and have a sodium content less than about 1 weight percent. It is preferred that the lithium-exchanged zeolite have an average particle size of less than about 10 microns.
REFERENCES:
patent: 3008803 (1961-11-01), Milton
patent: 4814303 (1989-03-01), Chowdhry et al.
patent: 4980323 (1990-12-01), Bedard et al.
D. W. Breck in Zeolite Molecular Sieves, John Wiley & Sons, New York (1974) pp. 493-396.
V. Dondur and R. Dimitrijevic, J. Solid Chem., 63, (1986) 46-51.
M. A. Subramonian et al., Mat. Res. Bull., 21, (1986) 1525-1532.
Bedard Robert L.
Flanigen Edith M.
Group Karl
Marcheschi Michael A.
McBride Thomas K.
Molinaro Frank S.
Snyder Eugene I.
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