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:
Feb. 24, 2015
Filed:
Mar. 30, 2010
Toshio Miyoshi, Osaka, JP;
Toshio Miyoshi, Osaka, JP;
Hitachi Metals, Ltd., Tokyo, JP;
Abstract
In a nanocomposite bulk magnet according to the present invention, nanocomposite magnet powder particles, including an NdFeB crystalline phase and an α-Fe phase, are combined together. The composition of the magnet is represented by T(BC)RTiM, where T is at least one transition metal element selected from the group consisting of Fe, Co and Ni and always including Fe, R is at least one rare-earth element including substantially no La or Ce, M is an additive metallic element, and x, y, z, n and q satisfy 4 at %≦x≦10 at %, 6 at %≦y≦10 at %, 0.05 at %≦z≦5 at %, 0 at %≦n≦10 at %, and 0≦q≦0.5, respectively. The powder particles have a minor-axis size of less than 40 μm. And powder particles, of which the major-axis size exceeds 53 μm, account for at least 90 mass % of the entire magnet. And those powder particles are directly combined with each other. Consequently, a full-dense magnet, of which the density is 96% or more of the true density of its material alloy, is realized.