Pressed powder material and rotating electric machine

Patent metadata

Field	Value
Publication number	US-2021305851-A1
Application number	US-202017002811-A
Country	US
Kind code	A1
Filing date	Aug 26, 2020
Priority date	Mar 18, 2020
Publication date	Sep 30, 2021
Grant date	—

Abstract

A pressed powder material of the embodiments is a pressed powder material including: 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; 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 pressed powder material includes a plane, and in which the pressed powder material includes, in a predetermined cross-section perpendicular to the flat surfaces, a void site at the boundary part between the flat surface of a flaky magnetic metal particle and the intercalated phase in contact with the flat surface, and the ratio of the length of the void site is 20% or less with respect to the length of the flat surface.

First claim

What is claimed is:

1 . A pressed powder 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; 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), wherein the pressed powder material includes a plane, and wherein the pressed powder material includes, in a predetermined cross-section perpendicular to the flat surfaces, a void site at the boundary part between the flat surface of a flaky magnetic metal particle and the intercalated phase in contact with the flat surface, and the ratio of the length of the void site is 20% or less with respect to the length of the flat surface.

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

3 . The pressed powder 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).

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

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

6 . The pressed powder material according to claim 1 , wherein the intercalated phase contains a resin having no glass transition point up to the thermal decomposition temperature.

7 . The pressed powder material according to claim 1 , wherein the intercalated phase is a polyimide resin.

8 . A rotating electric machine comprising the pressed powder material according to claim 1 .

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

10 . A rotating electric machine comprising a core containing the pressed powder material according to claim 1 .

Assignees

• Toshiba Kk

Inventors

• Sanada Naoyuki
• Suetsuna Tomohiro
• Kinouchi Hiroaki
• Hotta Yasuyuki

Classifications

• B22F1/08

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

• B22F1/05

  Metallic powder characterised by the size or surface area of the 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

• B22F1/068

  Flake-like particles · CPC title

• H01F1/24 Primary

  the particles being insulated · CPC title