Compositions: ceramic – Ceramic compositions – Refractory
Patent
1991-07-15
1993-03-09
Group, Karl
Compositions: ceramic
Ceramic compositions
Refractory
501153, 501154, 502 64, C04B 3510
Patent
active
051927225
ABSTRACT:
This invention relates to processes for preparing a ceramic article having as its principal crystalline phase a leucite/pollucite solid solution. The process involves the use of a zeolite to form the article. Zeolites which can be used are those that have a SiO.sub.2 /Al.sub.2 O.sub.3 ratio of about 3.5 to about 7.5 such as zeolite Y. The zeolite is exchanged with potassium, rubidium and cesium, then calcined at a temperature of about 900.degree. to about 1100.degree. C. for a time to collapse the zeolite framework and provide an amorphous powder. Next, the amorphous powder is formed into a shaped article and the article is sintered at a temperature of about 1150.degree. to about 1400.degree. C. for a time of about 0.5 to about 12 hours to give a ceramic article whose principal crystalline phase is a leucite/pollucite solid solution, is substantially crack free, has less than 5% porosity, and a coefficient of thermal expansion of about 2.times.10.sup.-6 to about 27.times.10.sup.-60 C.sup.-1. This invention also relates to the leucite/pollucite ceramic article.
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Bedard Robert L.
Flanigen Edith M.
Group Karl
McBride Thomas K.
Molinaro Frank S.
Snyder Eugene I.
UOP
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