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US5125990A
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Magnetically anisotropic hot-worked magnet and method of producing same
Assignee: Proterial Ltd
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Filing: 1990-06-01
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Granted: 1992-06-30
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Expires: 2010-06-01
Abstract
Abstract A magnetically anisotropic hot-worked magnet made of an R-T-B alloy containing a transition metal T as a main component, a rare earth element R including yttrium, and boron B; the magnet having the fine crystal grains having an average grain size of 0.02 -1.0 mu m, and having a carbon content of 0.8 weight % or less and an oxygen content of 0.5 weight % or less. The angular variance of orientation of the crystal grains is within 30 DEG from the C axes of the crystal grains when measured by X-ray. This magnet can be produced by mixing the magnet flakes with an additive composed of at least one organic compound having a boiling point of 50 DEG C. or higher.
Inventors
- 👤 Katsunori Iwasaki
- 👤 Shigeho Tanigawa
- 👤 Masaaki Tokunaga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:52
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/047; H01F1/053; H01F1/055; H01F1/057; H01F1/0571; H01F1/0575; H01F1/0576
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
68 words
A magnetically anisotropic hot-worked magnet made of an R-T-B alloy containing a transition metal T as a main component, a rear earth element R including yttrium, and boron B; said magnet having fine crystal grains having an average grain size of 0.02-1.0 μm, and having a carbon content of from about 0.3 to 0.8 weight % and an oxygen content of from about 0.07 to 0.5 weight %.
Claim 2
Dependent Claim
68 words
A magnetically anisotropic hot-worked magnet made of an R-T-B alloy containing a transition metal T as a main component, a rear earth element R including yttrium, and boron B; said magnet having fine crystal grains having an average grain size of 0.02-1.0 μm, and having a carbon content of from about 0.3 to 0.8 weight % and an oxygen content of from about 0.07 to 0.5 weight %.
Claim 3
Dependent Claim
75 words
A magnetically anisotropic hot-worked magnet made of an R-T-B alloy containing a transition metal T as a main component, a rare earth element R including yttrium, and boron B; said magnet having fine crystal grains having an average grain size of 0.02-1.0 μm, having a carbon content of from about 0.3 0.8 weight % and an oxygen content of from about 0.07 to 0.5 to weight %, and having a substantially uniform residual strain distribution.
Claim 4
Dependent Claim
75 words
A magnetically anisotropic hot-worked magnet made of an R-T-B alloy containing a transition metal T as a main component, a rare earth element R including yttrium, and boron B; said magnet having fine crystal grains having an average grain size of 0.02-1.0 μm, having a carbon content of from about 0.3 0.8 weight % and an oxygen content of from about 0.07 to 0.5 to weight %, and having a substantially uniform residual strain distribution.
Claim 5
Dependent Claim
92 words
A magnetically anisotropic hot-worked magnet made of an R-T-B alloy containing a transition metal T as a main component, a rare earth element R including yttrium, and boron B, said magnet having fine crystal grains having an average grain size of 0.02-1.0 μm, the angular variance of orientation of said crystal grains being within 30° from the C axes of said crystal grains when measured by X-ray, and having a carbon content of from about 0.3 to 0.8 weight % and an oxygen content of from about 0.07 to 0.5 weight %.
Claim 6
Dependent Claim
92 words
A magnetically anisotropic hot-worked magnet made of an R-T-B alloy containing a transition metal T as a main component, a rare earth element R including yttrium, and boron B, said magnet having fine crystal grains having an average grain size of 0.02-1.0 μm, the angular variance of orientation of said crystal grains being within 30° from the C axes of said crystal grains when measured by X-ray, and having a carbon content of from about 0.3 to 0.8 weight % and an oxygen content of from about 0.07 to 0.5 weight %.
Claim 7
Dependent Claim
27 words
The magnetic alloy anisotropic hot-worked magnet according to claim 3, wherein difference between the maximum and minimum values of angular variance of orientation is 10° or less.
Claim 8
Dependent Claim
49 words
The magnetically anisotropic hot-worked magnet as in claim 1 produced by a process including the step of mixing with said alloy, a liquid additive composed of at least one organic compound having a boiling point of 50° C. or higher, and hot-working the mixture to provide said magnetic anisotropy.
Claim 9
Dependent Claim
49 words
The magnetically anisotropic hot-worked magnet as in claim 2 produced by a process including the step of mixing with said alloy, a liquid additive composed of at least one organic compound having a boiling point of 50° C. or higher, and hot-working the mixture to provide said magnetic anisotropy.
Claim 10
Dependent Claim
49 words
The magnetically anisotropic hot-worked magnet as in claim 3 produced by a process including the step of mixing with said alloy, a liquid additive composed of at least one organic compound having a boiling point of 50° C. or higher, and hot-working the mixture to provide said magnetic anisotropy.
Claim 11
Dependent Claim
21 words
The magnetically anisotropic hot-worked magnet as in claim 3 wherein the angular variance is measured at the surface of the magnet.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-30 | 1995-12-30 | 1996-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-30 | 1999-12-30 | 2000-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-30 | 2003-12-30 | 2004-06-30 | $7700.00 | Window Closed / Lapsed |