Rare earth thin film magnet, process for producing same, and target for forming rare earth thin film magnet
US-2016343482-A1 · Nov 24, 2016 · US
Rare earth based permanent magnet
US2016240293A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2016240293-A1 |
| Application number | US-201615044831-A |
| Country | US |
| Kind code | A1 |
| Filing date | Feb 16, 2016 |
| Priority date | Feb 16, 2015 |
| Publication date | Aug 18, 2016 |
| Grant date | — |
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Abstract
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A rare earth based permanent magnet has a sintered compact with R-T-B based composition. The compact has two kinds of main phase grains M1 and M2 having different concentration distributions of R including R1 and R2 respectively representing at least one rare earth element including Y and excluding Dy, Tb and Ho, and at least one from Ho, Dy and Tb. M1 and M2 have a core-shell structure containing a shell part coating a core part. In M1, when the R1 and R2 atom concentrations in the core and shell parts are defined as αR1, αR2, βR1 and βR2, respectively, αR1>βR1, αR2<βR2, αR1>αR2 and βR1<βR2. In M2, when the R1 and R2 atom concentrations in the core and shell parts are defined as γR1, γR2, εR1 and εR2, respectively, γR1<εR1, γR2>εR2, γR1<γR2 and εR1>εR2. Ratios occupied by the main phase grains having the core-shell structure are 5% or more, respectively.
First claim
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What is claimed is: 1 . A rare earth based permanent magnet comprising a sintered compact with an R-T-B based composition, wherein, the sintered compact comprises two kinds of main phase grains M1 and M2, wherein, the concentration distribution of R in M1 is different iron that in M2, R comprises R1 and R2, R1 represents at least one rare earth element including Y and excluding Dy, Tb and Ho, R2 represents at least one from the group consisting of Ho, Dy and Tb, the main phase…
Assignees
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Classifications
Electricity · mapped topic
Electricity · mapped topic
- H01F1/053Primary
Electricity · mapped topic
- H01F1/0572Primary
Electricity · mapped topic
- H01F1/0577Primary
Electricity · mapped topic
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- What does patent US2016240293A1 cover?
- A rare earth based permanent magnet has a sintered compact with R-T-B based composition. The compact has two kinds of main phase grains M1 and M2 having different concentration distributions of R including R1 and R2 respectively representing at least one rare earth element including Y and excluding Dy, Tb and Ho, and at least one from Ho, Dy and Tb. M1 and M2 have a core-shell structure contain…
- Who is the assignee on this patent?
- Tdk Corp
- What technology area does this patent fall under?
- Primary CPC classification H01F1/053. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Thu Aug 18 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).