R-T-B based sintered magnet
US-10096410-B2 · Oct 9, 2018 · US
Rare earth permanent magnet
US10453595B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10453595-B2 |
| Application number | US-201715443748-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 27, 2017 |
| Priority date | Feb 29, 2016 |
| Publication date | Oct 22, 2019 |
| Grant date | Oct 22, 2019 |
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- Title
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Abstract
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A rare earth permanent magnet includes a main phase composed of a main phase particle and a grain boundary present among a plurality of the main phase particles. The grain boundary includes a region whose electric resistance is higher than that of the main phase.
First claim
Opening claim text (preview).
The invention claimed is: 1. A rare earth permanent magnet comprising a plurality of main phase particles and grain boundaries present among a plurality of the main phase particles, wherein the grain boundary includes a region whose electric resistance is higher than that of the main phase particles, the grain boundary includes a region whose electric resistance is lower than that of the main phase particles, and the region whose electric resistance is lower than that of the main phase particles is harder relative to hardness than the main phase particles. 2. The rare earth permanent magnet according to claim 1 , wherein the region whose electric resistance is lower than that of the main phase particles is present in the two-grain interface. 3. The rare earth permanent magnet according to claim 2 , wherein a lowest electric resistance in the region whose electric resistance is lower than that of the main phase particles is 0.1 times or less than a highest electric resistance in the main phase particles. 4. The rare earth permanent magnet according to claim 1 , wherein a lowest electric resistance in the region whose electric resistance is lower than that of the main phase particles is 0.1 times or less than a highest electric resistance in the main phase particles. 5. The rare earth permanent magnet according to claim 1 , wherein an average value of electric resistance in the region whose electric resistance is lower than that of the main phase particles is 0.1 times or less than an average value of electric resistance in the main phase.
Assignees
Inventors
Classifications
- H02K1/02Primary
characterised by the magnetic material · CPC title
containing aluminium · CPC title
sintered · CPC title
containing cobalt · CPC title
in the form of particles, e.g. rapid quenched powders or ribbon flakes · CPC title
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Frequently asked questions
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- What does patent US10453595B2 cover?
- A rare earth permanent magnet includes a main phase composed of a main phase particle and a grain boundary present among a plurality of the main phase particles. The grain boundary includes a region whose electric resistance is higher than that of the main phase.
- Who is the assignee on this patent?
- Tdk Corp
- What technology area does this patent fall under?
- Primary CPC classification H02K1/02. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Oct 22 2019 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 6 related publications on this page (citations in our corpus or others sharing the same primary CPC).