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. 07, 1992
Filed:
May. 21, 1991
Andrew S Kim, Pittsburgh, PA (US);
Crucible Materials Corporation, Syracuse, NY (US);
Abstract
A method for improving the magnetic properties, particulaarly intrinsic coercivity, of particles of a permanent magnet alloy comprising a rare earth element, iron and boron. The method includes subjecting particles to a hydrogen atmosphere for a time at elevated temperature sufficient to hydride the particles. The hydrogen atmosphere is removed while maintaining the particles at the elevated temperature. Thereafter, while maintaining the particles at elevated temperature, the particles are subjected to a vacuum atmosphere for a time at the maintained elevated temperature sufficient to dehydride the particles. Thereafter, while maintaining the particles at the elevated temperature, they are again subjected to a hydrogen atmosphere for a time at the maintained elevated temperature sufficient to hydride the particles. The hydrogen atmosphere is removed while maintaining the particles at the elevated temperature. Thereafter, the particles are subjected to a vacuum atmosphere for a time at the maintained elevated temperature sufficient to dehydride the particles. The dehydrided particles are then cooled to room temperature.