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:
Aug. 06, 1991
Filed:
Dec. 17, 1990
Earl G Brewer, Warren, MI (US);
Carlton D Fuerst, Royal Oak, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
Diffusion alloying techniques are used to introduce low level additives into hot-worked Nd-Fe-B magnets. The powdered metal is added to the rapidly solidifed ribbons of the magnetic alloy prior to hot working. Diffusion alloying during hot-working permits the final chemistry of the magnet and more specifically the grain boundaries to be determined during the final processing steps. Elements which diffuse into the matrix, such as zinc, copper and nickel, enhance the coercivity by as much as 100 percent in die-upset magnets. At optimum levels, approximately 0.5-0.8 weight percent, the additives did not diminish the remanence or energy product of the magnet.