R-t-b based sintered magnet
US-2016086701-A1 · Mar 24, 2016 · US
R-T-B based sintered magnet and motor
US10388441B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10388441-B2 |
| Application number | US-201414909606-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 8, 2014 |
| Priority date | Aug 9, 2013 |
| Publication date | Aug 20, 2019 |
| Grant date | Aug 20, 2019 |
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Abstract
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The present invention provides an R-T-B based sintered magnet that inhibits the demagnetization rate at high temperature even when less or no heavy rare earth elements such as Dy, Tb and the like are used. The R-T-B based sintered magnet includes R2T14B crystal grains and two-grain boundary parts between the R2T14B crystal grains. Two-grain boundary parts formed by R—Co—Cu-M-Fe phase exist, and M is at least one selected from the group consisting of Ga, Si, Sn, Ge and Bi.
First claim
Opening claim text (preview).
What is claimed is: 1. An R-T-B based sintered magnet comprising R 2 T 14 B crystal grains and two-grain boundary parts between the R 2 T 14 B crystal grains, wherein said R-T-B based sintered magnet comprises the two-grain boundary parts formed by R—Co—Cu-M-Fe phase and two-grain boundary parts formed by R—Cu-M-Fe phase, and M is at least one selected from the group consisting of Ga, Si, Sn, Ge and Bi, the content of Co relative to the total mass of the R-T-B based sintered magnet is 0.4 mass % or more and 3.0 mass % or less, and A is more than B, wherein the number of the two-grain boundary parts formed by R—Co—Cu-M-Fe phase is represented by A and the number of the two-grain boundary parts formed by R—Cu-M-Fe phase is represented by B. 2. A motor comprising the R-T-B based sintered magnet according to claim 1 . 3. The R-T-B based sintered magnet according to claim 1 , wherein the thickness of the two-grain boundary parts formed by R—Co—Cu-M-Fe phase is 5˜500 nm. 4. A motor comprising the R-T-B based sintered magnet according to claim 3 . 5. The R-T-B based sintered magnet according to claim 1 , wherein M is at least Ga. 6. The R-T-B based sintered magnet according to claim 1 , wherein M is at least Si. 7. The R-T-B based sintered magnet according to claim 1 , wherein M is at least Sn. 8. The R-T-B based sintered magnet according to claim 1 , wherein M is at least Ge. 9. The R-T-B based sintered magnet according to claim 1 , wherein M is at least Bi.
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Classifications
Magnetic · CPC title
Aspects linked to processes or compositions used in powder metallurgy · CPC title
sintered · CPC title
- C22C38/00Primary
Ferrous alloys, e.g. steel alloys (cast-iron alloys C22C37/00) · CPC title
Processes characterised by the sequence of their steps · CPC title
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- What does patent US10388441B2 cover?
- The present invention provides an R-T-B based sintered magnet that inhibits the demagnetization rate at high temperature even when less or no heavy rare earth elements such as Dy, Tb and the like are used. The R-T-B based sintered magnet includes R2T14B crystal grains and two-grain boundary parts between the R2T14B crystal grains. Two-grain boundary parts formed by R—Co—Cu-M-Fe phase exist, and…
- Who is the assignee on this patent?
- Tdk Corp
- What technology area does this patent fall under?
- Primary CPC classification C22C38/00. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Aug 20 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 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).