Sintered ferrite magnet
US-2020211743-A1 · Jul 2, 2020 · US
Ferrite sintered magnet, ferrite particles, bonded magnet, and rotating electrical machine
US2022157498A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2022157498-A1 |
| Application number | US-202017598508-A |
| Country | US |
| Kind code | A1 |
| Filing date | Mar 27, 2020 |
| Priority date | Mar 29, 2019 |
| Publication date | May 19, 2022 |
| Grant date | — |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
A ferrite sintered magnet has a ferrite phase having a magnetoplumbite-type crystal structure, and contains at least a metal element A, a metal element R, Fe, Co, Zn, and B. The element A is at least one kind of element selected from the group consisting of Sr, Ba, Ca, and Pb, and essentially includes Ca. The element R is at least one kind of element selected from the group consisting of Bi and rare-earth elements including Y, and essentially includes La. Atomic ratios of the metal elements satisfy the following expressions.A1-rRrFexCoyZnz (1)0.40≤r≤0.70 (2)8.20≤x≤9.34 (3)0.05<y≤0.50 (4)0<z≤0.20 (5)The content of Si is 0 to 0.60% by mass in terms of SiO2, and the content of B is 0.01 to 0.70% by mass in terms of B2O3.
First claim
Opening claim text (preview).
1 : A ferrite sintered magnet having a ferrite phase having a magnetoplumbite-type crystal structure, containing: at least a metal element A, a metal element R, Fe, Co, Zn, and B, wherein the metal element A is at least one kind of element selected from the group consisting of Sr, Ba, Ca, and Pb, and essentially includes Ca, the metal element R is at least one kind of element selected from the group consisting of Bi and rare-earth elements including Y, and essentially includes La, when an atomic ratio of the metal elements is expressed by Formula (1), r, x, y, and z satisfy the following Expressions (2) to (5), A 1-r R r Fe x Co y Zn z (1) 0.40≤ r≤ 0.70 (2) 8.20≤ x≤ 9.34 (3) 0.05< y≤ 0.50 (4) 0< z≤ 0.20 (5) the content of Si is 0 to 0.60% by mass in terms of SiO 2 , and the content of B is 0.01 to 0.70% by mass in terms of B 2 O 3 . 2 : The ferrite sintered magnet according to claim 1 , wherein the content of Si is 0.01 to 0.40% by mass in terms of SiO 2 , and the content of B is 0.20 to 0.70% by mass in terms of B 2 O 3 . 3 : The ferrite sintered magnet according to claim 1 , wherein Ca occupies 95 atomic % or more of the metal element A. 4 : A rotating electrical machine comprising: the ferrite sintered magnet according to claim 1 . 5 : Ferrite particles having a ferrite phase having a magnetoplumbite-type crystal structure, containing: at least a metal element A, a metal element R, Fe, Co, Zn, and B, wherein the metal element A is at least one kind of element selected from the group consisting of Sr, Ba, Ca, and Pb, and essentially includes Ca, the metal element R is at least one kind of element selected from the group consisting of Bi and rare-earth elements including Y, and essentially includes La, when an atomic ratio of the metal elements is expressed by Formula (1), r, x, y, and z satisfy the following Expressions (2) to (5), A 1-r R r Fe x Co y Zn z (1) 0.40≤ r≤ 0.70 (2) 8.20≤ x≤ 9.34 (3) 0.05< y≤ 0.50 (4) 0< z≤ 0.20 (5) the content of Si is 0 to 0.60% by mass in terms of SiO 2 , and the content of B is 0.01 to 0.70% by mass in terms of B 2 O 3 . 6 : The ferrite particles according to claim 5 , wherein the content of Si is 0.01 to 0.40% by mass in terms of SiO 2 , and the content of B is 0.20 to 0.70% by mass in terms of B 2 O 3 . 7 : The ferrite particles according to claim 5 , wherein Ca occupies 95 atomic % or more of the metal element A. 8 : A bonded magnet containing: the ferrite particles according to claim 5 . 9 : A rotating electrical machine comprising: the bonded magnet according to claim 8 .
Assignees
Inventors
Classifications
- H01F1/11Primary
in the form of particles {(for magnetic record carriers G11B5/70626)} · CPC title
in a bonding agent · CPC title
containing rare earths, e.g. (La0.3Sr0.7)CoO3 · CPC title
Magnetic properties · CPC title
Compounds characterised by their crystallite size · CPC title
Patent family
Related publications grouped by family.
External sources
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US2022157498A1 cover?
- A ferrite sintered magnet has a ferrite phase having a magnetoplumbite-type crystal structure, and contains at least a metal element A, a metal element R, Fe, Co, Zn, and B. The element A is at least one kind of element selected from the group consisting of Sr, Ba, Ca, and Pb, and essentially includes Ca. The element R is at least one kind of element selected from the group consisting of Bi and…
- Who is the assignee on this patent?
- Tdk Corp
- What technology area does this patent fall under?
- Primary CPC classification H01F1/11. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Thu May 19 2022 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).