Raw material for magnet, which comprises Sm—Fe binary alloy as main component, method for producing the same, and magnet

Patent metadata

Field	Value
Publication number	US-10632533-B2
Application number	US-201816031891-A
Country	US
Kind code	B2
Filing date	Jul 10, 2018
Priority date	Jan 28, 2016
Publication date	Apr 28, 2020
Grant date	Apr 28, 2020

Abstract

A raw material for a magnet, which comprises Sm and Fe. A magnet is obtained by nitriding this raw material for a magnet. In particular, a raw material for a magnet comprises an Sm—Fe binary alloy as a main component. An intensity ratio of an Sm 2 Fe 17 (024) peak to an SmFe 7 (110) peak is less than 0.001 as measured by an X-ray diffraction method.

First claim

The invention claimed is:

1. A raw material for a magnet, which comprises an Sm—Fe binary alloy as a main component, wherein an intensity ratio of an Sm 2 Fe 17 (024) peak to an SmFe 7 (110) peak is less than 0.001 as measured by an X-ray diffraction method,
wherein an Sm content in a total amount of Sm and Fe contained in the raw material for a magnet is from 9 at % to 14 at %.

2. A method for producing the raw material for a magnet according to claim 1 , which comprises:
subjecting a powdered base material for the raw material for a magnet, which is obtained by melting a mixture of samarium and iron, to a decomposition reaction by absorbing hydrogen and a recombination reaction by releasing hydrogen,
wherein the recombination reaction is carried out at a temperature from 600° C. to 675° C.

3. A magnet comprising a nitride of the raw material for a magnet according to claim 1 .

Assignees

• Murata Manufacturing Co
• Aist

Inventors

• Oga Satoshi
• Takagi Kenta
• Ozaki Kimihiro

Classifications

• C22C33/04

  by melting · CPC title

• C22C38/005

  containing rare earths, i.e. Sc, Y, Lanthanides · CPC title

• H01F1/059 Primary

  and Va elements, e.g. Sm2Fe17N2 · CPC title

• H01F41/0253

  for manufacturing permanent magnets · CPC title

• C22C2202/02

  Magnetic · CPC title