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:
May. 30, 1989
Filed:
Apr. 20, 1988
Edward A Bush, Painted Post, NY (US);
K Pattabhirami Reddy, Corning, NY (US);
Louis S Socha, Jr, Painted Post, NY (US);
Didier-Werke AG, Wiesbaden, DE;
Abstract
Magnesia partially-stabilized zirconia ceramic materials can be prepared from 'unpurified' zirconia which contains at least about 0.05 weight percent silica. Despite the relatively high silica content, a thermal shock resistant material can be produced by a firing schedule which includes heating to a top temperature at a specified rate and cooling back to room temperature at specified rates and which incorporates a thermal aging step at 1000-1200.degree. C. Differences in microstructure and monoclinic zirconia content, with consequent differences in physical properties of the ceramic material, can be attained by variations in the firing and thermal-aging schedules.