Ferrite sintered magnet
US-2017207011-A1 · Jul 20, 2017 · US
Ferrite sintered magnet
US11440848B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11440848-B2 |
| Application number | US-202016782343-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 5, 2020 |
| Priority date | Feb 7, 2019 |
| Publication date | Sep 13, 2022 |
| Grant date | Sep 13, 2022 |
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.
This ferrite sintered magnet comprises metallic elements at an atomic ratio represented by formula (1):Ca1-w-xRwSrxFezCom (1)in formula (1), R is at least one element selected from the group consisting of rare-earth elements and Bi, and R comprises at least La, in formula (1), w, x, z and m satisfy formulae (2) to (5):0.360≤w≤0.420 (2)0.110≤x≤0.173 (3)8.51≤z≤9.71 (4)0.208≤m≤0.269 (5), andin a section parallel to an axis of easy magnetization, when the number of total ferrite grains is N and the number of ferrite grains having a stacking fault is n, 0≤n/N≤0.20 is satisfied.
First claim
Opening claim text (preview).
What is claimed is: 1. A ferrite sintered magnet comprising ferrite grains having a hexagonal structure, wherein the ferrite sintered magnet comprises metallic elements at an atomic ratio represented by formula (1): Ca 1-w-x R w Sr x Fe z Co m (1) in formula (1), R is at least one element selected from the group consisting of rare-earth elements and Bi, and R comprises at least La, in formula (1), w, x, z and m satisfy formulae (2) to (5): 0.360≤ w≤ 0.420 (2) 0.110≤ x≤ 0.173 (3) 8.51≤ z≤ 9.71 (4) 0.208≤ m≤ 0.269 (5), and in a section parallel to an axis of easy magnetization, when a number of total ferrite grains is N and a number of ferrite grains having a stacking fault is n, 0≤n/N≤0.20 is satisfied. 2. The ferrite sintered magnet according to claim 1 , further comprising 0.03 to 0.3% by mass of Al in terms of Al 2 O 3 . 3. The ferrite sintered magnet according to claim 1 , further comprising 0.037 to 0.181% by mass of B in terms of H 3 BO 3 . 4. The ferrite sintered magnet according to claim 2 , further comprising 0.037 to 0.181% by mass of B in terms of H 3 BO 3 .
Assignees
Inventors
Classifications
Co3O4 · CPC title
- H01F41/0266Primary
Moulding; Pressing (H01F41/0273 takes precedence; hard magnetic particles H01F1/06, H01F1/11) · CPC title
in the form of particles {(for magnetic record carriers G11B5/70626)} · CPC title
Other ferrites containing nickel, copper or cobalt · CPC title
Treatment time · 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 US11440848B2 cover?
- This ferrite sintered magnet comprises metallic elements at an atomic ratio represented by formula (1):Ca1-w-xRwSrxFezCom (1)in formula (1), R is at least one element selected from the group consisting of rare-earth elements and Bi, and R comprises at least La, in formula (1), w, x, z and m satisfy formulae (2) to (5):0.360≤w≤0.420 (2)0.110≤x≤0.173 (3)8.51≤z≤9.71 (4)0.208≤m≤0.269 (5), andi…
- Who is the assignee on this patent?
- Tdk Corp
- What technology area does this patent fall under?
- Primary CPC classification H01F41/0266. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Sep 13 2022 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).