HIGH RESISTANCE MAGNET AND MOTOR USING THE SAME

• US 20100141367A1
• Filed: 02/19/2010
• Published: 06/10/2010
• Est. Priority Date: 08/30/2006
• Status: Active Grant

• Current Assignee: Matahiro Komuro, Takao Imagawa, Yuichi Satsu
• Original Assignee: Matahiro Komuro, Takao Imagawa, Yuichi Satsu
• Inventors: Komuro, Matahiro, Satsu, Yuichi, Imagawa, Takao
• Granted Patent: US 7,972,450 B2
• Time in Patent Office: Days
• US Class Current: 335/302
• CPC Class Codes: B82Y 10/00 Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
• CPC Class Codes: G11B 5/65 characterised by its composition G11B5/66 takes precedence
• CPC Class Codes: G11B 5/657 containing inorganic, non-oxide compound of Si, N, P, B, H or C, e.g. in metal alloy or compound containing oxygen G11B5/658
• CPC Class Codes: G11B 5/743 Patterned record carriers, wherein the magnetic recording layer is patterned into magnetic isolated data islands, e.g. discrete tracks
• CPC Class Codes: G11B 5/82 Disk carriers
• CPC Class Codes: H01F 1/0571 in the form of particles, e.g. rapid quenched powders or ribbon flakes
• CPC Class Codes: H01F 41/0293 diffusion of rare earth elements, e.g. Tb, Dy or Ho, into permanent magnets
• CPC Class Codes: H02K 1/02 characterised by the magnetic material
• CPC Class Codes: Y10T 29/53261 Means to align and advance work part
• CPC Class Codes: Y10T 409/305656 including means to support work for rotation during operation
• CPC Class Codes: Y10T 409/305712 and including means to infeed cutter toward work axis
• CPC Class Codes: Y10T 409/305768 with linear movement of work
• CPC Class Codes: Y10T 409/305824 with angular movement of work
• CPC Class Codes: Y10T 428/258 Alkali metal or alkaline earth metal or compound thereof
• CPC Class Codes: Y10T 428/26 Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension

Abstract

A magnet comprising grains of a ferromagnetic material whose main component is iron and a fluorine compound layer or an oxy-fluorine compound layer of fluoride compound particles of alkali metals, alkaline earth metals and rare earth elements, present on the surface of the ferromagnetic material grains, wherein an amount of iron atoms in the fluorine compound particles is 1 to 50 atomic %.

Claims

1. A magnet composed of united particles of a ferromagnetic material whose main component is iron, each of the particles comprising the ferromagnetic material and a layer of a fluorine compound of at least one member selected from the group consisting of alkali metals, alkaline earth metals and transition metals, coated on surfaces of the particles, wherein the layer of the fluorine compound contains iron in a range of from 1 to 50 atomic %, the particles have a face-centered cubic, and a particle size of the particles is 1 to 300 μ

m.

2. The magnet according to claim 1, wherein the fluorine compound contains iron in a range of from 1 to 5 atomic %, and wherein the face-centered cubic has a lattice constant of 0.54 to 0.60.

3. The magnet according to claim 1, wherein the particles comprise a fluorine-rich phase, an iron-rich phase and a rare earth-rich phase.

4. The magnet according to claim 1, wherein the fluorine compound is one of a fluoride, an oxy-fluoride and a mixture thereof.

5. The magnet according to claim 1, wherein the fluorine compound is represented by R-Fe-B, wherein R is a rare earth metal, Fe is iron, and B is boron.

6. The magnet according to claim 1, wherein the fluorine compound is at least one member selected from the group consisting of NdF₃, LiF, MgF₂, CaF₂, ScF₂, VF₂, VF₃, CrF₂, CrF₃, MnF₂, MnF₃, CoF₂, CoF₃, NiF₂, ZnF₂, AlF₃, GaF₃, SrF₃, YF₃, ZrF₃, NbF₅, AgF, InF₃, SnF₂, SnF₄, BaF₂, LaF₂, LaF₃, CeF₃, PrF₃, NdF₂, SmF₂, SmF₃, EuF₂, EuF₃, GdF₃, TbF₃, TbF₄, DyF₂, DyF₃, HoF₂, HoF₃, ErF₂, ErF₃, TmF₂, TmF₃, YbF₂, YbF₃, LuF₂, LuF₃, PbF₂, and BiF₃.

7. The magnet according to claim 1, wherein the fluorine compound has a particle size of 1 to 500 nm.

8. The magnet according to claim 1, wherein the fluorine compound has a higher electric resistance than that of the particles of the ferromagnetic material.

9. The magnet according to claim 1, wherein the magnet has a recoil magnetic permeability of 1.04 to 1.30.

10. The magnet according to claim 1, wherein the specific resistance is 0.2 mΩ

cm or more.

11. The magnet according to claim 1, wherein the oxy-fluorine compound is represented by Rw (OxFy) z wherein w, x, y and z are integers and R is at least one member selected from the group consisting of Li, Mg, Ca, Sc, Mn, Co, Ni, Zn, Al, Ga, Sr, Y, Zr, Nb, Ag, In, Sn, Ba, La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Pb and Bi.

17. The magnet according to claim 1, wherein the fluorine compound has a higher electric resistance than that of the particles of the ferromagnetic material.

18. The magnet according to claim 1, wherein the magnet has a recoil magnetic permeability of 1.04 to 1.30.

19. The magnet according to claim 1, wherein the specific resistance is 0.2 mΩ

cm or more.

12. A magnet composed of united particles of a ferromagnetic material whose main component is iron, each of the particles comprising the ferromagnetic material and a layer of a fluorine compound of at least one member selected from the group consisting of alkali metals, alkaline earth metals and transition metals, coated on surfaces of the particles, wherein the particles have a face-centered cubic, and a particle size of the particles is 1 to 300 μ

m, wherein the layer of the fluorine compound comprises iron in an amount of 50 atomic % or more, at least one member selected from the group consisting of alkali metals, alkaline earth metals and transition metals in an amount of 5 to 30% atomic % and fluorine in an amount of 1 to 20% atomic %.

13. The magnet according to claim 12, wherein the fluorine compound contains iron in a range of from 1 to 5 atomic % and wherein the face-centered cubic has a lattice constant of 0.54 to 0.60.

14. The magnet according to claim 12, wherein the particles comprises fluorine-rich phase, an iron-rich phase and a rare earth-rich phase.

15. The magnet according to claim 12, wherein the fluorine compound is one of a fluoride, an oxy-fluoride and a mixture thereof.

16. The magnet according to claim 12, wherein the fluorine compound is represented by R-Fe-B, wherein R is a rare earth metal, Fe is iron, and B is boron.