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
R-T-B based alloy strip, and R-T-B based sintered magnet and method for producing same
US9607742B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9607742-B2 |
| Application number | US-201214351119-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 11, 2012 |
| Priority date | Oct 13, 2011 |
| Publication date | Mar 28, 2017 |
| Grant date | Mar 28, 2017 |
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Abstract
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An R-T-B based alloy strip containing dendritic crystals including a R 2 T 14 B phase, wherein on at least one surface, the average value for the widths of the dendritic crystals is no greater than 60 μm, and the number of crystal nuclei in the dendritic crystals is at least 500 per 1 mm square area.
First claim
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The invention claimed is: 1. An R-T-B based alloy strip comprising dendritic crystals including a R 2 T 14 B phase, wherein R represents at least one element selected from the group consisting of rare earth elements, T represents at least one of iron and cobalt, and B represents boron, wherein on a casting surface of the R-T-B based alloy strip, the dendritic crystal has a crystal nucleus and filler-shaped crystals extending in a radial fashion with the crystal nucleus as the origin, each of the widths of the dendritic crystals is determined as the maximum distance among the distances between tips of two different filler-shaped crystals, the average value for the widths of the dendritic crystals is no greater than 60 μm, and the number of crystal nuclei in the dendritic crystals is at least 500 per 1 mm square area. 2. The R-T-B based alloy strip according to claim 1 , wherein the average value for the widths of the dendritic crystals is 25 μm or greater. 3. The R-T-B based alloy strip according to claim 1 , wherein the average value for the aspect ratio of crystal groups comprising a plurality of the dendritic crystals is 0.8 or greater. 4. An R-T-B based sintered magnet obtained by molding and firing alloy powder obtained by grinding an R-T-B based alloy strip according to claim 1 . 5. A method for producing an R-T-B based sintered magnet, comprising the steps of: grinding an R-T-B based alloy strip according to claim 1 to prepare an alloy powder, and molding and firing the alloy powder to produce the R-T-B based sintered magnet.
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Classifications
sintered · CPC title
containing cobalt · CPC title
Moulding; Pressing (H01F41/0273 takes precedence; hard magnetic particles H01F1/06, H01F1/11) · CPC title
containing aluminium · CPC title
containing copper · CPC title
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- What does patent US9607742B2 cover?
- An R-T-B based alloy strip containing dendritic crystals including a R 2 T 14 B phase, wherein on at least one surface, the average value for the widths of the dendritic crystals is no greater than 60 μm, and the number of crystal nuclei in the dendritic crystals is at least 500 per 1 mm square area.
- 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 Tue Mar 28 2017 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 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).