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R-t-b-based rare earth sintered magnet and alloy for r-t-b-based rare earth sintered magnet
US2016268024A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2016268024-A1 |
| Application number | US-201615066143-A |
| Country | US |
| Kind code | A1 |
| Filing date | Mar 10, 2016 |
| Priority date | Mar 13, 2015 |
| Publication date | Sep 15, 2016 |
| Grant date | — |
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Abstract
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An R-T-B-based rare earth sintered magnet, comprising a rare earth element R, B, a metallic element M which includes one or more metals selected from Al, Ga and Cu, a transition metal T which includes Fe as a main component, and inevitable impurities, wherein the sintered magnet includes 13 atom % to 15.5 atom % of R, 5.0 atom % to 6.0 atom % of B, 0.1 atom % to 2.4 atom % of M, and T and the inevitable impurities as a balance, and wherein the sintered magnet includes 0.015 atom % to 0.10 atom % of Zr as the transition metal T.
First claim
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What is claimed is: 1 . An R-T-B-based rare earth sintered magnet, comprising a rare earth element R, B, a metallic element M which includes one or more metals selected from Al, Ga and Cu, a transition metal T which includes Fe as a main component, and inevitable impurities, wherein the sintered magnet includes 13 atom % to 15.5 atom % of R, 5.0 atom % to 6.0 atom % of B, 0.1 atom % to 2.4 atom % of M, and T and the inevitable impurities as a balance, and wherein the sintered magnet includes 0.015 atom % to 0.10 atom % of Zr as the transition metal T. 2 . The R-T-B-based rare earth sintered magnet according to claim 1 , wherein, in a grain boundary phase, the Zr does not form a compound with the B. 3 . The R-T-B-based rare earth sintered magnet according to claim 1 , wherein the sintered magnet satisfies the following formula (1): 0.32≦B/TRE≦0.40 (1) wherein, in the formula (1), B represents a concentration (atom %) of a boron element and TRE represents a concentration (atom %) of total rare earth elements. 4 . An alloy for an R-T-B-based rare earth sintered magnet, comprising: a rare earth element R, B, a metallic element M which includes one or more metals selected from Al, Ga and Cu, a transition metal T which includes Fe as a main component, and inevitable impurities, wherein the sintered magnet includes 13 atom % to 15.5 atom % of R, 5.0 atom % to 6.0 atom % of B, 0.1 atom % to 2.4 atom % of M, and T and the inevitable impurities as a balance, and wherein the sintered magnet includes 0.015 atom % to 0.10 atom % of Zr as the transition metal T. 5 . The alloy for an R-T-B-based rare earth sintered magnet according to claim 4 , wherein the sintered magnet satisfies the following formula (1): 0.32≦B/TRE≦0.40 (1) wherein, in the formula (1), B represents a concentration (atom %) of a boron element and TRE represents a concentration (atom %) of total rare earth elements.
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Classifications
containing cobalt · CPC title
containing copper · CPC title
containing aluminium · CPC title
containing rare earths, i.e. Sc, Y, Lanthanides · CPC title
sintered · CPC title
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- What does patent US2016268024A1 cover?
- An R-T-B-based rare earth sintered magnet, comprising a rare earth element R, B, a metallic element M which includes one or more metals selected from Al, Ga and Cu, a transition metal T which includes Fe as a main component, and inevitable impurities, wherein the sintered magnet includes 13 atom % to 15.5 atom % of R, 5.0 atom % to 6.0 atom % of B, 0.1 atom % to 2.4 atom % of M, and T and the i…
- Who is the assignee on this patent?
- Showa Denko Kk
- What technology area does this patent fall under?
- Primary CPC classification C22C38/002. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Thu Sep 15 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 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).