Method for producing sintered ferrit magnet, and sintered ferrite magnet
US-2015332819-A1 · Nov 19, 2015 · US
Ferrite sintered magnet and rotating electric machine
US2021304934A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2021304934-A1 |
| Application number | US-202117198517-A |
| Country | US |
| Kind code | A1 |
| Filing date | Mar 11, 2021 |
| Priority date | Mar 30, 2020 |
| Publication date | Sep 30, 2021 |
| 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.
To provide a ferrite sintered magnet having a high residual magnetic flux density (Br) and a high coercive force (HcJ), and also able to produce at a low cost. The ferrite sintered magnet includes a hexagonal M-type ferrite including A, R, Fe, and Co in an atomic ratio of A 1-x R x (Fe 12-y Co y ) z O 19 . A is at least one selected from Sr, Ba, and Pb. R is La only or La and at least one selected from rare earth elements. 0.13≤x≤0.23, 10.80≤(12−y)z≤12.10, and 0.13≤yz≤0.20 are satisfied.
First claim
Opening claim text (preview).
What is claimed is: 1 . A ferrite sintered magnet comprising a hexagonal M-type ferrite including A, R, Fe, and Co in an atomic ratio of A 1-x R x (Fe 12-y Co y ) z O 19 , wherein A is at least one selected from Sr, Ba, and Pb, R is La only or La and at least one selected from rare earth elements, and 0.13≤x≤0.23, 10.80≤(12−y)z≤12.10, and 0.13≤yz≤0.20 are satisfied. 2 . The ferrite sintered magnet according to claim 1 , wherein 0.30≤Mc≤0.85 is satisfied in which Mc is CaO content (mass %) converted from a content of Ca included in the ferrite sintered magnet. 3 . The ferrite sintered magnet according to claim 1 , wherein 0.35≤Ms≤0.60 is satisfied in which Ms is SiO 2 content (mass %) converted from a content of Si included in the ferrite sintered magnet. 4 . The ferrite sintered magnet according to claim 1 , wherein 0≤Mb≤0.15 is satisfied in which Mb is BaO content (mass %) converted from a content of Ba included in the ferrite sintered magnet. 5 . The ferrite sintered magnet according to claim 1 , wherein 0≤Ma≤0.90 is satisfied in which Ma is Al 2 O 3 content (mass %) converted from a content of Al included in the ferrite sintered magnet. 6 . The ferrite sintered magnet according to claim 1 , wherein 0≤Mr≤0.10 is satisfied in which Mr is Cr 2 O 3 content (mass %) converted from a content of Cr included in the ferrite sintered magnet. 7 . A rotating electric machine including the ferrite sintered magnet according to claim 1 .
Assignees
Inventors
Classifications
non-metallic substances, e.g. ferrites {, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure} · CPC title
Chromium oxides, chromates, or oxide-forming salts thereof · CPC title
containing barium, strontium or calcium · CPC title
Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina · CPC title
Barium oxides or oxide-forming salts thereof · 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 US2021304934A1 cover?
- To provide a ferrite sintered magnet having a high residual magnetic flux density (Br) and a high coercive force (HcJ), and also able to produce at a low cost. The ferrite sintered magnet includes a hexagonal M-type ferrite including A, R, Fe, and Co in an atomic ratio of A 1-x R x (Fe 12-y Co y ) z O 19 . A is at least one selected from Sr, Ba, and Pb. R is La only or La and at least one selec…
- 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 Sep 30 2021 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 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).