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:
Apr. 27, 1993
Filed:
Nov. 20, 1991
Graham P Dransfield, Stockton on Tees, GB;
Paul McColgan, Stockton on Tees, GB;
Tioxide Group Services Limited, London, GB;
Abstract
The invention provides a form of particulate zirconia suitable for forming zirconia ceramics in which the zirconia is stabilized in the cubic and/or tetragonal phase. The particles of zirconia are coated with a hydrous oxide of cerium and at least one hydrous oxide of lanthanum, neodymium or praseodymium. In a preferred embodiment a mixture of hydrous oxides of lanthanum and neodymium is used. Preferably the particles are also provided with an inner coating comprising hydrous titania, zirconia or alumina. The products of the invention can be converted into ceramics having a greater strength than ceramics produced from zirconia coated with a similar amount of ceria alone or those produced by physically mixing similar quantities of stabilizing oxides with the particulate zirconia.