Claims
- 1. Method of manufacturing anisotropic magnetic powder for a magnetically anisotropic bond magnet, comprising the steps of rapidly-quenching the molten metal of an R-TM-B-M alloy, wherein R is at least one of the rare earth elements including Y, TM is Fe or Fe a part of which has been substituted with Co, B is boron, and M is at least one additive selected from the group consisting of Si, Al, Nb, Zr, Hf, P and C, to make flakes of the alloy, compacting the flakes to form a high density body, plastically deforming the body to produce an average crystal grain size of 0.01-0.5 .mu.m and magnetic anisotropy, and crushing the plastically deformed body.
- 2. The manufacturing method as set forth in claim 1, including the preliminary step of selecting the R-TM-B-M system alloy consisting essentially of 11-18 at % of rare earth elements, 4-11 at % of boron, 30 at % or less of Co, 3 at % or less of the additives M and the balance Fe and unavoidable impurities.
- 3. The manufacturing method as in claim 1 including the further step of heat-treating the plastically deformed body prior to crushing.
- 4. The manufacturing method as set forth in claim 3, wherein during the heat-treating step the anisotropic R-TM-B-M system alloy is heated to a temperature of from 600.degree. C. to 900.degree. C., retained at the temperature for not longer than 240 minutes, and then cooled at cooling rate of 1.degree. C./sec or higher.
- 5. The manufacturing method as in claim 1 wherein said plastically deforming step includes a deformation ratio of at least about 2.4.
- 6. The manufacturing method as in claim 1 wherein said plastically deforming step includes a deformation ratio of at least about 3.0.
- 7. The manufacturing method as in claim 1 wherein said plastically deforming step includes a deformation ratio of at least about 4.1.
- 8. The manufacturing method as in claim 1 wherein said plastically deforming step includes a deformation ratio of at least about 5.6.
- 9. The manufacturing method as in claim 1 wherein said plastically deforming step includes a deformation ratio of at least about 6.3.
- 10. The manufacturing method as in claim 1 wherein said plastically deforming step includes a deformation ratio of at least about 7.2.
- 11. The manufacturing method as in claim 3 wherein said plastically deforming step includes a deformation ratio of at least about 2.4.
- 12. The manufacturing method as in claim 3 wherein said plastically deforming step includes a deformation ratio of at least about 3.0.
- 13. The manufacturing method as in claim 3 wherein said plastically deforming step includes a deformation ratio of at least about 4.1.
- 14. The manufacturing method as in claim 3 wherein said plastically deforming step includes a deformation ratio of at least about 5.6.
- 15. The manufacturing method as in claim 3 wherein said plastically deforming step includes a deformation ratio of at least about 6.3.
- 16. The manufacturing method as in claim 3 wherein said plastically deforming step includes a deformation ratio of at least about 7.2.
Priority Claims (2)
Number |
Date |
Country |
Kind |
61-62174 |
Mar 1986 |
JPX |
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61-106187 |
May 1986 |
JPX |
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Parent Case Info
This is a division of application Ser. No. 07/366,160, filed June 14, 1989, now U.S. Pat. No. 4,952,239, continuation of application Ser. No. 07/026,969 filed Mar. 17, 1987, now U.S. Pat. No. 4,921,553.
US Referenced Citations (4)
Foreign Referenced Citations (12)
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May 1984 |
EPX |
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JPX |
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Apr 1984 |
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Dec 1984 |
JPX |
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Jan 1985 |
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Feb 1985 |
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Non-Patent Literature Citations (1)
Entry |
K. Gudimetta et al, "Magnetic Properties Fe-R-B Powders": Appl. Phys. Lett. 48(10), 10 Mar. 1986, pp. 670-672. |
Divisions (1)
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Number |
Date |
Country |
Parent |
366160 |
Jun 1989 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
26969 |
Mar 1987 |
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