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:
Jan. 31, 1984
Filed:
Mar. 09, 1982
Roger W Davidge, Wantage, GB;
James L Woodhead, Didcot, GB;
United Kingdom Atomic Energy Authority, London, GB;
Abstract
Sintered materials are known comprising a ceramic matrix (e.g. of Al.sub.2 O.sub.3) and, distributed therein, a refractory material in a metastable, high temperature enantiotropic form of higher density than its room temperature enantiotropic form such as ZrO.sub.2 which has a metastable tetragonal form and a room temperature monoclinic form. The sintered materials have enhanced fracture and bending strength. The invention provides a method of making such materials from a mixture where the refractory material and optionally the ceramic material are in the form of a sol. The mixture is dried and subsequently sintered to give a product where the refractory material is distributed very uniformly and in its metastable form. Improved properties have been obtained by including a stabilizing agent (e.g. Y.sub.2 O.sub.3) in the final product.