Bonded magnet and method of preparing the same

Patent metadata

Field	Value
Publication number	US-12148554-B2
Application number	US-201916586889-A
Country	US
Kind code	B2
Filing date	Sep 27, 2019
Priority date	Sep 28, 2018
Publication date	Nov 19, 2024
Grant date	Nov 19, 2024

Abstract

The present invention provides a bonded magnet having good heat resistance. The present invention relates to a bonded magnet containing a SmFeN magnetic powder, nylon 12, and a hexafluoroisopropanol-unextractable component. The present invention also relates to a method of preparing a bonded magnet, including: bringing a raw material bonded magnet containing a SmFeN magnetic powder and nylon 12 into contact with an amorphizing agent; and heat-treating the raw material bonded magnet in contact with the amorphizing agent.

First claim

What is claimed is:

1. A bonded magnet, comprising:
a SmFeN magnetic powder;
nylon 12; and
a surface layer including a hexafluoroisopropanol-unextractable component and having a thickness of 100 μm or greater and 1 mm or less in a depth direction from a surface of the bonded magnet,
wherein a proportion of the hexafluoroisopropanol-unextractable component in the surface layer of an extraction residue from 24-hour Soxhlet extraction with hexafluoroisopropanol of the bonded magnet is greater than 0.9 and 6.1 or less,
the proportion of the hexafluoroisopropanol-unextractable component is defined by an equation: C/Fe×100,
wherein the C is C concentration by mass, and
the Fe is Fe concentration by mass.

2. The bonded magnet according to claim 1 ,
wherein the bonded magnet comprises the hexafluoroisopropanol-unextractable component in an amount of greater than 0.1% by mass and 5% by mass or less.

3. The bonded magnet according to claim 1 ,
wherein the hexafluoroisopropanol-unextractable component is present in a larger amount in the surface layer than in a central portion of the bonded magnet.

Assignees

• Nichia Corp

Inventors

• Tada Shuichi

Classifications

• Y10T428/32

  Composite [nonstructural laminate] of inorganic material having metal-compound-containing layer and having defined magnetic layer · CPC title

• H01F1/059 Primary

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

• C22C38/005 Primary

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

• C22C2202/02

  Magnetic · CPC title

• H02K1/02

  characterised by the magnetic material · CPC title