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. 10, 2011
Filed:
Dec. 30, 2005
John G. Darab, Flemington, NJ (US);
John G. Darab, Flemington, NJ (US);
Magnesium Elektron Limited, Salford, GB;
Abstract
An improved method for the formation of composite hydroxides or oxides comprising, on an oxide basis, AlOand ZrO, and optionally CeO, LaO, NdO, PrO, SmO, YO, and other rare earth oxides, comprising the steps of preparing an aqueous metal salt solution and forming a hydroxide precipitate slurry by combining the aqueous metal salt solution with an aqueous solution of a caustic alkali at a pH greater than 8.5 to precipitate out all the metal species. The variation in pH during the precipitation reaction is ±1. The invention also relates to composites formed by this method comprising 20-70 wt % AlO, 10-77 wt % ZrO, 0-34 wt % CeOand 0-22 wt % REOs other than CeO, and to composites per se comprising, on an oxide basis, 42-70 wt % AlO, 10-48 wt % ZrO, 2-34 wt % CeOand 0-9 wt % REOs other than CeOand having the following properties after heating to 850° C. over four hours and holding at 850° C. for four hours then allowing to cool to ambient temperature: —a surface area after aging at 950° C. for 2 hours equal to or greater than 60 m/g, and —a surface area after aging at 1100° C. for 2 hours equal to or greater than 30 m/g.