The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 09, 1993
Filed:
Jul. 15, 1991
Robert L Bedard, Fishkill, NY (US);
Edith M Flanigen, White Plains, NY (US);
UOP, Des Plaines, IL (US);
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.