Magnetic material and rotating electric machine

Patent metadata

Field	Value
Publication number	US-12406789-B2
Application number	US-202016807400-A
Country	US
Kind code	B2
Filing date	Mar 3, 2020
Priority date	Sep 18, 2019
Publication date	Sep 2, 2025
Grant date	Sep 2, 2025

Abstract

A magnetic material of the embodiments is a magnetic material including: a plurality of flaky magnetic metal particles, each flaky magnetic metal particle having a flat surface; and an intercalated phase existing between the flaky magnetic metal particles and containing at least one second element selected from the group consisting of oxygen (O), carbon (C), nitrogen (N), and fluorine (F), in which the magnetic material includes the intercalated phase at a volume ratio of from 4% to 17% and includes voids at a volume ratio of 30% or less, and an average angle of orientation between the flat surface and a plane of the magnetic material is 10° or less.

First claim

What is claimed is:

1. A magnetic material, comprising:
a plurality of flaky magnetic metal particles, each flaky magnetic metal particle having a flat surface, and a magnetic metal phase containing at least one first element selected from the group consisting of Fe, Co, and Ni, the flaky magnetic metal particles having an average thickness of from 10 nm to 100 μm and an average value of the ratio of the average length in the flat surface to the thickness of from 5 to 10,000;
an intercalated phase existing between the flaky magnetic metal particles and containing at least one second element selected from the group consisting of oxygen (O), carbon (C), nitrogen (N), and fluorine (F); and
a plane,
wherein the magnetic material includes the intercalated phase at a volume ratio of from 4% to 17% and includes voids at a volume ratio of 30% or less, and an average angle of orientation between the flat surface and the plane of the magnetic material is 10° or less.

2. The magnetic material according to claim 1 , wherein the magnetic material has the difference in coercivity on the basis of direction within the plane of the magnetic material.

3. The magnetic material according to claim 2 , wherein the proportion of the difference in coercivity on the basis of direction within the plane is 1% or more.

4. The magnetic material according to claim 1 , wherein at least a portion of the surface of the flaky magnetic metal particles is covered with a coating layer having a thickness of from 0.1 nm to 1 μm and containing at least one second element selected from the group consisting of oxygen (O), carbon (C), nitrogen (N), and fluorine (F).

5. The magnetic material according to claim 1 , wherein the intercalated phase contains a resin having a weight reduction percentage of 5% or less after heating for 3,000 hours at 180° C.

6. The magnetic material according to claim 1 , wherein the magnetic material has a weight reduction percentage of 5% or less after heating for 3,000 hours at 180° C.

7. The magnetic material according to claim 1 , wherein the intercalated phase contains a resin having a glass transition temperature of 180° C. or higher.

8. The magnetic material according to claim 1 , wherein the intercalated phase contains a resin having no glass transition point exceeding the thermal decomposition temperature.

9. The magnetic material according to claim 1 , wherein the intercalated phase is a polyimide resin.

10. The magnetic material according to claim 9 , wherein the polyimide resin contains a repeating unit represented by the following Chemical Formula (1)

11. The magnetic material according to claim 1 , wherein the flat surface has either or both of a plurality of concavities and a plurality of convexities, the concavities and the convexities being arranged in a first direction and each of the concavities and the convexities having a width of 0.1 μm or more, a length of 1 μm or more, and an aspect ratio of 2 or higher.

12. The magnetic material according to claim 1 , wherein the flaky magnetic metal particles have a lattice strain of from 0.01% to 10%.

13. The magnetic material according to claim 1 , wherein the flaky magnetic metal particles are a plurality of flaky magnetic metal particles including a plurality of small magnetic metal particles, each of the flaky magnetic metal particles having five or more on the average of the small magnetic metal particles disposed on the flat surface, the small magnetic metal particles containing at least one first element selected from the group consisting of Fe, Co, and Ni and having an average particle size of from 10 nm to 1 μm.

14. A rotating electric machine comprising the magnetic material according to claim 1 .

15. A rotating electric machine comprising a magnetic wedge containing the magnetic material according to claim 1 .

16. A rotating electric machine comprising a core containing the magnetic material according to claim 1 .

17. A magnetic material, comprising:
a plurality of flaky magnetic metal particles, each flaky magnetic metal particle having a flat surface, and a magnetic metal phase containing iron (Fe), cobalt (Co), and silicon (Si), the magnetic metal phase containing Co in an amount of from 0.001 at % to 80 at % with respect to the total amount of Fe and Co and containing Si in an amount of from 0.001 at % to 30 at % with respect to the total amount of the magnetic metal phase, the flaky magnetic metal particles having an average thickness of from 10 nm to 100 μm and an average value of the ratio of the average length in the flat surface to the thickness of from 5 to 10,000;
an intercalated phase existing between the flaky magnetic metal particles and containing at least one second element selected from the group consisting of oxygen (O), carbon (C), nitrogen (N), and fluorine (F); and
a plane,
wherein the magnetic material includes the intercalated phase at a volume ratio of from 4% to 17% and includes voids at a volume ratio of 30% or less, and an average angle of orientation between the flat surface and the plane of the magnetic material is 10° or less.

18. The magnetic material according to claim 17 , wherein the magnetic metal phase has an average crystal grain size of 1 μm or more.

19. The magnetic material according to claim 17 , wherein the magnetic material has the difference in coercivity on the basis of direction within the plane of the magnetic material.

20. The magnetic material according to claim 19 , wherein the proportion of the difference in coercivity on the basis of direction within the plane is 1% or more.

Assignees

• Toshiba Kk

Inventors

• Sanada Naoyuki
• Suetsuna Tomohiro
• Kinouchi Hiroaki

Classifications

• B22F1/068

  Flake-like particles · CPC title

• B22F1/16

  Metallic particles coated with a non-metal (coated with lubricating or binding agents or with organic material B22F1/10) · CPC title

• B22F1/08

  Metallic powder characterised by particles having an amorphous microstructure · CPC title

• B22F1/10

  Metallic powder containing lubricating or binding agents; Metallic powder containing organic material · CPC title

• B22F2304/10

  Micron size particles, i.e. above 1 micrometer up to 500 micrometer · CPC title