Method for producing sintered ferrite magnet, and sintered ferrite magnet
US-9162928-B2 · Oct 20, 2015 · US
Ferrite sintered magnet, ferrite particles, bonded magnet, motor, and generator
US11810699B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11810699-B2 |
| Application number | US-201716469833-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 22, 2017 |
| Priority date | Dec 22, 2016 |
| Publication date | Nov 7, 2023 |
| Grant date | Nov 7, 2023 |
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Abstract
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Provided is a ferrite sintered magnet including a ferrite phase having a magnetoplumbite-type crystal structure. x, y, and m satisfy the following Equations (1), (2), and (3) when composition of the ferrite sintered magnet is represented by R 1-x A x Fe m-y Co y , where R denotes at least one kind of element selected from rare earth elements including Y and A denotes Ca or Ca and elements including at least one kind selected from Sr or Ba. The content of B in the ferrite sintered magnet is from 0.1% to 0.6% by mass in terms of B 2 O 3 . 0.2≤ x ≤0.8 (1) 0.1≤ y ≤0.65 (2) 3≤ m <14 (3)
First claim
Opening claim text (preview).
The invention claimed is: 1. A ferrite sintered magnet comprising a ferrite phase having a magnetoplumbite-type crystal structure, wherein x1, x2, y, and m satisfy the following Equations (6), (7), (8) and (9) when composition of the ferrite sintered magnet is represented by R 1-x1-x2 Ca x1 Sr x2 Fe m-y Co y , where R denotes at least one kind of element selected from rare earth elements including Y: 0.2≤ x 1≤0.5 (6) 0≤ x 2≤0.1 (7) 0.2≤ y ≤0.4 (8) 6.5≤ m ≤9.5 (9), a content of B is from 0.2% to 0.4% by mass or less in terms of B 2 O 3 , and a content of Si is less than 0.3% by mass when Si is converted into SiO 2 , and wherein a coercive force of the ferrite sintered magnet at 20° C. is 652 Oe or more. 2. The ferrite sintered magnet according to claim 1 , wherein the following Equations (4) and (5) are satisfied: 0.2≤ x 1 +x 2<0.55 (4) 7.5< m≤ 9.5 (5). 3. A motor comprising the ferrite sintered magnet according to claim 1 . 4. A generator comprising the ferrite sintered magnet according to claim 1 .
Assignees
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Classifications
- H01F1/11Primary
in the form of particles {(for magnetic record carriers G11B5/70626)} · CPC title
- C04B35/2633Primary
containing barium, strontium or calcium · CPC title
of calcined, sintered clinker or ceramics · CPC title
Wet mixtures · CPC title
Burning or sintering processes (C04B33/32 takes precedence {; powder metallurgy B22F}) · CPC title
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- What does patent US11810699B2 cover?
- Provided is a ferrite sintered magnet including a ferrite phase having a magnetoplumbite-type crystal structure. x, y, and m satisfy the following Equations (1), (2), and (3) when composition of the ferrite sintered magnet is represented by R 1-x A x Fe m-y Co y , where R denotes at least one kind of element selected from rare earth elements including Y and A denotes Ca or Ca and elements inclu…
- 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 Tue Nov 07 2023 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).