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:
Jun. 18, 2002
Filed:
Jul. 13, 2001
Shinya Sakurada, Tokyo, JP;
Takahiro Hirai, Kamakura, JP;
Keisuke Hashimoto, Yokohama, JP;
Tomohisa Arai, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A magnetic material essentially consists of a composition represented by general formula: R R B N H M (in the formula, R denotes at least one kind element selected from rare earth elements, R denotes at least one kind element selected from Zr, Hf and Sc, M denotes at least one kind element selected from Fe and Co, X, Y, Z, U and V are numbers satisfying 2 at. %≦X, 0.01 at. %≦Y, 4≦X+Y≦20 at. %, 0≦Z≦10 at. %, 0.1≦U≦18 at. %, 0.01≦V≦10 at. %, respectively), and comprises a TbCu type crystal phase as a principal phase. A nitriding treatment to a mother alloy is carried out in a mixed gas of ammonia gas and hydrogen gas of which partial pressure ratio is set in the range of 3<P /P when partial pressure of ammonia gas is P , that of the hydrogen gas is P . According to such a nitriding treatment, without hindering rapid absorption of nitrogen by a mother alloy of which principal phase is a TbCu type crystal phase, deterioration of magnetic characteristics due to too much absorption of nitrogen can be suppressed.