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. 27, 1996
Filed:
Aug. 12, 1994
Akihiko Tsutai, Kanagawa-ken, JP;
Takahiro Hirai, Kanagawa-ken, JP;
Shinya Sakurada, Kanagawa-ken, JP;
Kabushiki Kaisha Toshiba, Kanagawa-ken, JP;
Abstract
A permanent magnet is composed of a magnetic material which is represented by a general formula R1.sub.x R2.sub.y A.sub.z Co.sub.u Fe.sub.100-x-y-z-u (where R1 is at least one element selected from rare earth elements, R2 is at least one element selected from the group consisting of Sc, Zr and Hf, A is at least one element selected from the group of C, N and P, and x,y,z and u are atomic percent defined as 2.ltoreq.x, 4.ltoreq.x+y.ltoreq.20, 0.ltoreq.z.ltoreq.20, 0.ltoreq.u.ltoreq.70), wherein the material includes a principal phase of TbCu.sub.7 structure and .alpha.-Fe, a peak width at half height of the main peak of X-ray diffraction of the principal phase obtained by using Cu-K.alpha. X-rays with the resolution of 0.02.degree. or less is about 0.8.degree. or less, and a ratio of peak intensity between the principal phase and .alpha.-Fe satisfies a relation that the value of I.sub.Fe /(I.sub.p +I.sub.Fe) is about 0.4 or less where I.sub.p is the peak intensity of main peak of X-ray diffraction of the principal phase obtained by using Cu-K.alpha. X-rays and I.sub.Fe is that of .alpha.-Fe.