Bonded magnet and method of preparing the same

Patent metadata

Field	Value
Publication number	US-2020105445-A1
Application number	US-201916586889-A
Country	US
Kind code	A1
Filing date	Sep 27, 2019
Priority date	Sep 28, 2018
Publication date	Apr 2, 2020
Grant date	—

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 hexafluoroisopropanol-unextractable component.

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 at least partially present in a surface layer of the bonded magnet.

4 . The bonded magnet according to claim 2 ,
wherein the hexafluoroisopropanol-unextractable component is at least partially present in a surface layer of the bonded magnet.

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

6 . The bonded magnet according to claim 2 ,
wherein the hexafluoroisopropanol-unextractable component is present in a larger amount in a surface layer than in a central portion of the bonded magnet.

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

8 . The bonded magnet according to claim 4 ,
wherein the hexafluoroisopropanol-unextractable component is present in a larger amount in a surface layer than in a central portion of the bonded magnet.

9 . A method of preparing a bonded magnet, comprising:
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.

10 . The method of preparing a bonded magnet according to claim 9 ,
wherein the heat treatment is carried out at a temperature of 150° C. or higher and lower than 178° C.

11 . The method of preparing a bonded magnet according to claim 10 ,
wherein the heat treatment temperature is 160° C. or higher.

Assignees

• Nichia Corp

Inventors

• Tada Shuichi

Classifications

• H01F1/059 Primary

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

• H01F41/0253

  for manufacturing permanent magnets · CPC title

• H01F1/0558

  bonded together · CPC title

• C22C38/005 Primary

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

• C22C2200/02

  Amorphous · CPC title