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US 9,314,843 B2Granted
Powder for magnet
AssigneeSumitomo Electric Industries, Ltd.
InventorsToru Maeda, Asako Watanabe
Life of this patent
Estimating the term…
Abstract
The present invention provides a powder for a magnet which can form a rare earth magnet having excellent magnetic characteristics and which has excellent moldability, a method for producing the powder for a magnet, a powder compact, and a rare earth-iron-boron-based alloy material.
Claims4
A powder compact produced by compacting the powder for a magnet, comprising:
- each of magnetic particles constituting the powder for the magnet being composed of less than 40% by volume of a hydrogen compound of a rare earth element, an iron-containing material, and the balance composed of unavoidable impurities, wherein:
- said hydrogen compound of the rare earth element consists of the rare earth element and hydrogen;
- the iron-containing material consists of iron and an iron-boron alloy consisting of iron and boron;
- a phase of the hydrogen compound of the rare earth element and a phase of the iron-containing material are present adjacent to each other;
- the distance between the phases of the rare earth element hydrogen compound adjacent to each other with the phase of the iron-containing material interposed therebetween is 3 μm or less;
- the relative density of the powder compact is 85% or more;
- and
- the phase of the hydrogen compound is granular, and the granular hydrogen compound of a rare earth element is dispersed in the phase of the iron-containing material.
5 more elements
Dependencies are inferred from the claim text.