Ferrite sintered magnet
US-2017207012-A1 · Jul 20, 2017 · US
Ferrite sintered magnet and rotating electric machine comprising the same
US11557412B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11557412-B2 |
| Application number | US-202016825717-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 20, 2020 |
| Priority date | Mar 27, 2019 |
| Publication date | Jan 17, 2023 |
| Grant date | Jan 17, 2023 |
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Abstract
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A ferrite sintered magnet comprising an M type Sr ferrite having a hexagonal structure as a main phase, wherein the ferrite sintered magnet comprises La and Co, a content of B is 0.005 to 0.9% by mass in terms of B2O3, a content of Zn is 0.01 to 1.2% by mass in terms of ZnO, and the ferrite sintered magnet satisfies [La]/[Zn]≤0.79 and [Co]/[Zn]≤0.67 when an atomic concentration of La is represented by [La], an atomic concentration of Co is represented by [Co], and an atomic concentration of Zn is represented by [Zn].
First claim
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What is claimed is: 1. A ferrite sintered magnet comprising an M type Sr ferrite having a hexagonal structure as a main phase, wherein the ferrite sintered magnet comprises La and Co, a content of B is 0.005 to 0.9% by mass in terms of B 2 O 3 , a content of Zn is 0.01 to 1.2% by mass in terms of ZnO, and the ferrite sintered magnet satisfies [La]/[Zn]≤0.79 and [Co]/[Zn]≤0.67 when an atomic concentration of La is represented by [La], an atomic concentration of Co is represented by [Co], and an atomic concentration of Zn is represented by [Zn]. 2. The ferrite sintered magnet according to claim 1 , wherein a content of Si is 0.05 to 1.3% by mass in terms of SiO 2 . 3. The ferrite sintered magnet according to claim 1 , wherein a content of Ca is 0.15 to 2.0% by mass in terms of CaO. 4. The ferrite sintered magnet according to claim 1 , wherein the ferrite sintered magnet satisfies 11.3≤[Fe]/[Sr]≤13.1 when an atomic concentration of Fe is represented by [Fe] and an atomic concentration of Sr is represented by [Sr]. 5. The ferrite sintered magnet according to claim 1 , wherein the ferrite sintered magnet further includes one or more of Ca and Si, and wherein the ferrite sintered magnet satisfies 0.92≤[B+Ca+Zn]/[Si]≤11.42 when a total atomic concentration of B, Ca, and Zn is represented by [B+Ca+Zn] and an atomic concentration of Si is represented by [Si]. 6. The ferrite sintered magnet according to claim 1 , wherein the ferrite sintered magnet further includes one or more of Ca, Ba, Mn, Cr, Al, and Si, and wherein the ferrite sintered magnet satisfies 0.4≤Z≤3.6 when a total atomic concentration of Ca, Sr, Ba, and La is represented by [Ca+Sr+Ba+La], a total atomic concentration of Fe, Mn, Zn, Co, Cr, and Al is represented by [Fe+Mn+Zn+Co+Cr+Al], a total atomic concentration of Si and B is represented by [Si+B], and Z=([Ca+Sr+Ba+La]—[Fe+Mn+Zn+Co+Cr+Al]/12)/[Si+B]. 7. The ferrite sintered magnet according to claim 1 , comprising 0.25 to 1.5% by mass of Mn in terms of MnO. 8. The ferrite sintered magnet according to claim 1 , comprising 0.03 to 0.2% by mass of Cr in terms of Cr 2 O 3 . 9. A rotating electric machine comprising the ferrite sintered magnet according to claim 1 .
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Classifications
Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint · CPC title
Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina · CPC title
Boron oxide, borates, boric acids, or oxide forming salts thereof, e.g. borax · CPC title
characterised by the magnetic material · CPC title
Calcium oxide or oxide-forming salts thereof, e.g. lime · CPC title
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- What does patent US11557412B2 cover?
- A ferrite sintered magnet comprising an M type Sr ferrite having a hexagonal structure as a main phase, wherein the ferrite sintered magnet comprises La and Co, a content of B is 0.005 to 0.9% by mass in terms of B2O3, a content of Zn is 0.01 to 1.2% by mass in terms of ZnO, and the ferrite sintered magnet satisfies [La]/[Zn]≤0.79 and [Co]/[Zn]≤0.67 when an atomic concentration of La is represe…
- 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 Jan 17 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 5 related publications on this page (citations in our corpus or others sharing the same primary CPC).