Claims
- 1. Anisotropic magnetic powder for a magnetically anisotropic bond magnet comprising an alloy powder of the R-TM-B-M system, wherein R is at least one of 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, P and C, said powder having an average crystal size of 0.01-.05 .mu.m, an average grain size of 1-1,000 .mu.m, a flattened grain structure with (c) greater than (a) in which (c) is the average size of the grain in the direction perpendicular to the C-axis and (a) is the average size of the grain in the C-axis direction, and has magnetic anisotropy.
- 2. The magnetic powder as set forth in claim 1, wherein the R-TM-B-M system alloy powder consists essentially of 11-18 at % of rare earth elements, 4-11 at % of boron, 3 at % or less of the additives, and the balance iron and unavoidable impurities.
- 3. The magnetic powder as set forth in claim 2, wherein the residual induction in the direction of the easy magnetizing axis is 8 kilo-Gauss or higher.
- 4. The magnetic powder as set forth in claim 1, wherein the R-TM-B-M system anisotropic alloy powder is produced by the process comprising the steps of rapidly-quenching the molten metal of the R-TM-B-M alloy to make flakes of the alloy, compacting the flakes to form a high density body, plastically deforming the body to cause magnetic anisotropy in the body, and crushing the plastically deformed body.
- 5. The magnetic powder as set forth in claim 4, wherein the anisotropy is caused by a hot upsetting process.
- 6. The magnet powder as in claim 4, wherein the deformation ratio of the body is at least about 2.4.
- 7. The magnet powder as in claim 4, wherein the deformation ratio of the body is at least about 3.0.
- 8. The magnet powder as in claim 4, wherein the deformation ratio of the body is at least about 4.1.
- 9. The magnet powder as in claim 4, wherein the deformation ratio of the body is at least about 5.6.
- 10. The magnet powder as in claim 4, wherein the deformation ratio of the body is at least about 6.3.
- 11. The magnet powder as in claim 4, wherein the deformation ratio of the body is at least about 7.2.
- 12. The magnetic powder as in claim 1, wherein the R-T-M-B-M system alloy powder consists 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 additives, and the balance iron and unavoidable impurities.
- 13. Magnetic powder for a magnetically anisotropic bond magnet comprising an alloy powder of the R-TM-B-M system, wherein R is at least one or 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, P and C, said powder having an average crystal grain size of 0.01-0.5 .mu.m, having magnetic anisotropy, having an average grain size of 1-1,000 .mu.m, and having grains which have been plastically deformed to a flattened shape having a reduced thickness relative to the other grain dimensions to provide said anisotropy, wherein the C-axis of easy magnetization of each flattened grain is substantially aligned with the thickness direction.
- 14. The magnetic powder as set forth in claim 13, wherein the R-TM-B-M system alloy powder consists essentially of 11-18 at % of rare earth elements, 4-11 at % of boron, 3 at % or less of the additives, and the balance of iron and unavoidable impurities.
- 15. The magnetic powder as set forth in claim 14, wherein the residual induction in the direction of the easy magnetizing axis is 8 kilogauss or higher.
- 16. The magnetic powder as set forth in claim 13, wherein the R-TM-B-M system anisotropic alloy powder is produced by the process comprising the steps of rapidly-quenching the molten metal of the R-TM-B-M alloy to make flakes of the alloy, compacting the flakes to form a high density body, plastically deforming the body to cause magnetic anisotropy in the body, and crushing the plastically deformed body.
- 17. The magnetic powder as set forth in claim 16, wherein the anisotropy is caused by hot upsetting process.
- 18. The magnetic powder as in claim 13, wherein the R-TM-B-M system alloy powder consists essentially of 11-18% of rare earth elements, 4-11 at % boron, 30 at % or less of Co, 3 at % or less of additives, and the balance iron and unavoidable impurities.
Priority Claims (2)
Number |
Date |
Country |
Kind |
61-62174 |
Mar 1986 |
JPX |
|
61-106187 |
May 1986 |
JPX |
|
Parent Case Info
This is a continuation of application Ser. No. 026,969, filed Mar. 17, 1987 U.S. Pat. No. 4,921,553.
US Referenced Citations (4)
Foreign Referenced Citations (12)
Number |
Date |
Country |
0106948 |
May 1984 |
EPX |
0125752 |
Nov 1984 |
EPX |
0133758 |
Mar 1985 |
EPX |
0174735 |
Mar 1986 |
EPX |
0187538 |
Jul 1986 |
EPX |
59-46008 |
Mar 1984 |
JPX |
59-64733 |
Apr 1984 |
JPX |
59-64739 |
Apr 1984 |
JPX |
59-219904 |
Dec 1984 |
JPX |
60-27105 |
Feb 1985 |
JPX |
60-9852 |
Apr 1985 |
JPX |
60-100402 |
Jun 1985 |
JPX |
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. |
Continuations (1)
|
Number |
Date |
Country |
Parent |
26969 |
Mar 1987 |
|