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. 06, 1998
Filed:
Dec. 17, 1996
Yi-Hung Chiao, Midland, MI (US);
The Dow Chemical Company, Midland, MI (US);
Abstract
A sintered body is formed by mixing an aluminum nitride powder with an oxide of Dy, Pr, Nd, Sm, or mixture thereof, and, optionally, an oxide of Eu, Ce, or mixture thereof, to form an admixture and heating the admixture in a non-oxidizing non-reducing atmosphere to a temperature for a time sufficient to densify the admixture to greater than 90% of theoretical, wherein the sintered body contains about 1.4 to about 4.0 mole percent of the rare earth element according to the equation, ##EQU1## where M is the rare earth element, O is oxygen and MO.sub.1.5 is a rare earth oxide in which the rare earth element has a valence of .sup.+ 3 with the proviso that the amount of Ce, Eu, or mixture thereof, is at most about 55% by moles of the rare earth present in the body as expressed by MO.sub.1.5.