Sm—Fe—N magnet material and Sm—Fe—N bonded magnet

Patent metadata

Field	Value
Publication number	US-11742121-B2
Application number	US-201916285490-A
Country	US
Kind code	B2
Filing date	Feb 26, 2019
Priority date	Feb 28, 2018
Publication date	Aug 29, 2023
Grant date	Aug 29, 2023

Abstract

An Sm—Fe—N magnet material includes from 7.0 at % to 12 at % of Sm, from 0.1 at % to 1.5 at % of at least one element selected from the group consisting of Hf and Zr, from 0.05 at % to 0.5 at % of C, from 10 at % to 20 at % of N, and from 0 at % to 35 at % of Co, with a remainder being Fe and unavoidable impurities.

First claim

What is claimed is:

1. An Sm—Fe—N magnet material, comprising:
from 7.0 at % to 12 at % of Sm;
from 0.1 at % to 1.5 at % of at least one element selected from the group consisting of Hf and Zr;
from 0.05 at % to 0.09 at % of C;
from 10 at % to 20 at % of N;
from 0 at % to 35 at % of Co; and
at least one element selected from the group consisting of Al in a range from 0.1 at % to 0.5 at % and Si in a range from 0.15 at % to 0.5 at %,
with a remainder being Fe and unavoidable impurities,
wherein, when the Sm—Fe—N magnet material is maintained for 2,000 hours at 120° C. in atmosphere, an absolute value of a reduction rate from an initial demagnetizing factor is in a range from 1.8% to 2.2%, and
wherein the Sm—Fe—N bonded magnet has a residual magnetic flux density (Br) of B r ≥8.00 kG.

2. An Sm—Fe—N bonded magnet comprising a powder of the Sm—Fe—N magnet material according to claim 1 and a binder.

3. The Sm—Fe—N magnet material according to claim 1 , wherein, when the Sm—Fe—N magnet material is maintained for 2,000 hours at 120° C., an irreversible demagnetizing factor is in a range from 1.8% to 2.0%.

4. The Sm—Fe—N magnet material according to claim 1 , wherein the Sm—Fe—N magnet material includes Zr in a range from 0.1 at % to 1.5 at %.

5. The Sm—Fe—N magnet material according to claim 1 , wherein a content of Co in the Sm—Fe—N magnet material is more than 0 at %.

6. An Sm—Fe—N magnet material, consisting of:
from 7.0 at % to 12 at % of Sm;
from 0.1 at % to 1.5 at % of at least one element selected from the group consisting of Hf and Zr;
from 0.05 at % to 0.09 at % of C;
from 10 at % to 20 at % of N;
from 0 at % to 35 at % of Co; and
at least one element selected from the group consisting of Al in a range from 0.1 at % to 0.5 at % and Si in a range from 0.15 at % to 0.5 at %,
with a remainder being Fe and unavoidable impurities,
wherein the Sm—Fe—N bonded magnet has a residual magnetic flux density (B r ) of B r ≥8.00 kG.

7. The Sm—Fe—N magnet material according to claim 6 , wherein from 0.1 at % to 0.5 at % of Al is provided.

8. The Sm—Fe—N magnet material according to claim 7 , wherein from 0.15 at % to 0.5 at % of Si is provided.

9. The Sm—Fe—N magnet material according to claim 6 , wherein from 0.15 at % to 0.5 at % of Si is provided.

10. The Sm—Fe—N magnet material according to claim 6 , wherein, when the Sm—Fe—N magnet material is maintained for 2,000 hours at 120° C., an irreversible demagnetizing factor is in a range from 1.8% to 2.2%.

11. The Sm—Fe—N, magnet material according to claim 6 , wherein, when the Sm—Fe—N magnet material is maintained for 2,000 hours at 120° C., an irreversible demagnetizing factor is in a range from 1.8% to 2.0%.

12. The Sm—Fe—N magnet material according to claim 6 , wherein the Sm—Fe—N magnet material includes Zr in a range from 0.1 at % to 1.5 at %.

13. The Sm—Fe—N magnet material according to claim 6 , wherein a content of Co in the Sm—Fe—N magnet material is more than 0 at %.

14. An Sm—Fe—N magnet material, comprising:
from 7.0 at % to 12 at % of Sm;
from 0.1 at % to 1.5 at % of at least one element selected from the group consisting of Hf and Zr;
from 0.05 at % to 0.09 at % of C;
from 10 at % to 20 at % of N;
from 0 at % to 35 at % of Co;
from 0.1 at % to 0.5 at % of Al; and,
from 0.15 at % to 0.5 at % of Si,
with a remainder being Fe and unavoidable impurities,
wherein, when the Sm—Fe—N magnet material is maintained for 2,000 hours at 120° C. in atmosphere, an absolute value of a reduction rate from an initial demagnetizing factor is in a range from 1.8% to 2.2%.

Assignees

• Daido Steel Co Ltd

Inventors

• Sakazaki Iwao

Classifications

• H01F1/059 Primary

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

• C22C38/001

  containing N · CPC title

• C22C38/005

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

• C22C38/02

  containing silicon · CPC title

• C22C38/06

  containing aluminium · CPC title