R-T-B based sintered magnet and motor
US-10109403-B2 · Oct 23, 2018 · US
Alloy for R-T-B based sintered magnet and R-T-B based sintered magnet
US10242777B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10242777-B2 |
| Application number | US-201715420151-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 31, 2017 |
| Priority date | Feb 1, 2016 |
| Publication date | Mar 26, 2019 |
| Grant date | Mar 26, 2019 |
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- Title
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Abstract
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Provided is a sintered magnet that is an R-T-B based sintered magnet having a region having a concentration of at least one heavy rare earth element decreasing from the surface toward the inside, in which the at least one heavy rare earth element includes at least either of Tb or Dy, R includes Nd, T includes Fe, Co, and Cu, there is a grain boundary phase containing at least either of Tb or Dy and Nd between two main phase particles, and a value obtained by subtracting a half value width of a concentration distribution curve of Cu from a half value width of a concentration distribution curve of Tb or Dy in a part including the grain boundary phase is from 10 to 20 nm.
First claim
Opening claim text (preview).
What is claimed is: 1. A sintered magnet, wherein the sintered magnet is an R-T-B based sintered magnet having a region having a concentration of at least one heavy rare earth element decreasing from the surface toward the inside, wherein the at least one heavy rare earth element includes at least either of Tb or Dy, R includes Nd, T includes Fe, Co, and Cu, there is a grain boundary phase containing at least either of Tb or Dy and Nd between two main phase particles, and a value obtained by subtracting a half value width of a concentration distribution curve of Cu from a half value width of a concentration distribution curve of Tb or Dy in a part including the grain boundary phase is from 10 to 20 nm.
Assignees
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Classifications
Magnetic · CPC title
containing titanium or zirconium · CPC title
diffusion of rare earth elements, e.g. Tb, Dy or Ho, into permanent magnets · CPC title
Spray drying of solutions or suspensions · CPC title
containing copper · CPC title
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Frequently asked questions
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- What does patent US10242777B2 cover?
- Provided is a sintered magnet that is an R-T-B based sintered magnet having a region having a concentration of at least one heavy rare earth element decreasing from the surface toward the inside, in which the at least one heavy rare earth element includes at least either of Tb or Dy, R includes Nd, T includes Fe, Co, and Cu, there is a grain boundary phase containing at least either of Tb or Dy…
- Who is the assignee on this patent?
- Tdk Corp
- What technology area does this patent fall under?
- Primary CPC classification H01F1/0577. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Mar 26 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).