Connecting element, reinforcement and use of a connecting element
US-2024151036-A1 · May 9, 2024 · US
R-t-b based sintered magnet and motor
US2016196904A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2016196904-A1 |
| Application number | US-201414909606-A |
| Country | US |
| Kind code | A1 |
| Filing date | Aug 8, 2014 |
| Priority date | Aug 9, 2013 |
| Publication date | Jul 7, 2016 |
| Grant date | — |
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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 R 2 T 14 B crystal grains and two-grain boundary parts between the R 2 T 14 B 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
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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 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. 2 . The R-T-B based sintered magnet according to claim 1 , 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, and if 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, A is more than B. 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, and M is at least one selected from the group consisting of Ga, Si, Sn, Ge and Bi. 4 . A motor comprising the R-T-B based sintered magnet according to claim 1 . 5 . The R-T-B based sintered magnet according to claim 2 , wherein the thickness of the two-grain boundary parts formed by R—Co—Cu-M-Fe phase is 5˜500 nm, and M is at least one selected from the group consisting of Ga, Si, Sn, Ge and Bi. 6 . A motor comprising the R-T-B based sintered magnet according to claim 2 . 7 . A motor comprising the R-T-B based sintered magnet according to claim 3 . 8 . A motor comprising the R-T-B based sintered magnet according to claim 5 .
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Classifications
Magnetic · CPC title
Aspects linked to processes or compositions used in powder metallurgy · 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
sintered · CPC title
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- What does patent US2016196904A1 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 R 2 T 14 B crystal grains and two-grain boundary parts between the R 2 T 14 B crystal grains. Two-grain boundary parts formed by R—Co—Cu-M-Fe phase ex…
- 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 Thu Jul 07 2016 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).