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:
Jul. 21, 1981
Filed:
Jan. 04, 1980
Ronald C Garvie, Beaumaris, Victoria, AU;
Richard H Hannink, Oakleigh, Victoria, AU;
Neil A McKinnon, North Balwyn, Victoria, AU;
Other;
Abstract
A magnesia partially stabilized zirconia ceramic material possessing from about 2.8 to about 4.0 wt percent magnesia, and made from a zirconia powder containing no more than about 0.03 percent silica is described. The ceramic material has a microstructure, produced as a consequence of the method by which the material is made, which provides both high strength and good thermal shock resistance properties. This microstructure comprises grains of cubic stabilized zirconia within which are formed, during cooling from the firing temperature, precipitates of tetragonal zirconia. These precipitates are elliptical in shape, with a long axis of about 1500 Angstrom units. Additionally, some of the tetragonal zironcia precipitates are made to transform into a non-twinned microcrystalline monoclinic form of zirconia by reducing the temperature of the material to below 800.degree. C., then subsequently holding the material at a temperature in the range from 1000.degree. C. to about 1400.degree. C. The ceramic material may also contain up to 36 wt percent of hafnia. Such materials can be used for, inter alia, moulds, dies, tappet facings and cutting tools.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile