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:
Sep. 17, 1985
Filed:
Sep. 25, 1984
Hans H Stadelmaier, Raleigh, NC (US);
Nadia A ElMasry, Raleigh, NC (US);
North Carolina State University, Raleigh, NC (US);
Abstract
A method of producing high performance permanent magnets is disclosed in which particles of a master alloy consisting of Fe.sub.2 B having a maximum particle size of 50 microns is admixed with Fe powder and particles of a rare earth capable of combining with Fe and B to form a tetragonal compound of Fe.sub.14 R.sub.2 B type. The admixture is compacted and a magnetic material is formed of the master alloy, Fe powder and rate earth particles which includes a major phase of at least one intermetallic compound of the Fe-R-B type having a crystal structure of the substantially tetragonal system and while the particle size of the crystal structure is controlled by sintering the compacted admixture at a temperature of about 700.degree. C. to 1000.degree. C. for from a fraction of an hour to 36 hours. The magnetic material is then annealed at a temperature of about 550.degree. C. to 650.degree. C. for a fraction of an hour to 2 hours.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile