Magnetic material, magnet, and rotating machine

• US 20070071979A1
• Filed: 09/25/2006
• Published: 03/29/2007
• Est. Priority Date: 09/26/2005
• Status: Abandoned Application

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Komuro, Matahiro, Satsu, Yuichi, Kozono, Yuzo, Kondo, Yasuo
• Application Number:
  US11/525,928
• Publication Number:
  US 20070071979A1
• Time in Patent Office: Days
• US Class Current: 428/403
• CPC Class Codes: B22F 1/16 Metallic particles coated with a non-metal coated with lubricating or binding agents or with organic material B22F1/10
• CPC Class Codes: C22C 19/07 based on cobalt
• CPC Class Codes: C22C 2202/02 Magnetic
• CPC Class Codes: C22C 33/0278 with at least one alloying element having a minimum content above 5%
• CPC Class Codes: C22C 38/002 containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
• CPC Class Codes: C22C 38/005 containing rare earths, i.e. Sc, Y, Lanthanides
• CPC Class Codes: C23C 30/00 Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process C23C26/00, C23C28/00 take precedence
• CPC Class Codes: H01F 1/0552 with a protective layer
• CPC Class Codes: H01F 1/0557 sintered
• CPC Class Codes: H01F 1/0572 with a protective layer
• CPC Class Codes: H01F 1/0577 sintered
• CPC Class Codes: H01F 41/0293 diffusion of rare earth elements, e.g. Tb, Dy or Ho, into permanent magnets
• CPC Class Codes: Y10T 428/2991 Coated
• CPC Class Codes: Y10T 428/2993 Silicic or refractory material containing [e.g., tungsten oxide, glass, cement, etc.]
• CPC Class Codes: Y10T 428/32 Composite [nonstructural laminate] of inorganic material having metal-compound-containing layer and having defined magnetic layer
• CPC Class Codes: Y10T 428/325 Magnetic layer next to second metal compound-containing layer

Abstract

A magnetic material is including magnetic particles including a rare earth element, wherein a fluorine compound including an alkaline earth element or a rare earth element is formed on a surface of the magnetic particles, an oxygen concentration of the fluorine compound is higher than an oxygen concentration of the magnetic particle and the fluorine compound includes at least one type of element selected from the group consisting of the Li, Mg, Ca, Sc, V, Cr, Mn, Fe, Co, Ni, Zn, Al, Ga, Sr, Y, Zr, Nb, Ag, In, Sn, Ba, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Pb, and Bi elements.

Claims

1. A magnetic material is including magnetic particles including a rare earth element, wherein a fluorine compound including an alkaline earth element or a rare earth element is formed on a surface of the magnetic particles, and an oxygen concentration of the fluorine compound is higher than an oxygen concentration of the magnetic particle.

2. A magnetic material according to claim 1, wherein the magnetic particle includes Nd, Fe, and B elements.

3. A magnetic material according to claim 1, wherein the magnetic particle includes Sm and Co elements.

4. A magnetic material according to claim 1, wherein the fluorine compound includes at least one type of element selected from the group consisting of the Li, Mg, Ca, Sc, V, Cr, Mn, Fe, Co, Ni, Zn, Al, Ga, Sr, Y, Zr, Nb, Ag, In, Sn, Ba, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Pb, and Bi elements.

5. A magnetic material according to claim 1, wherein a layer is formed near an interface between the fluorine compound and the magnetic particle on which the fluorine compound is formed, the layer has a higher saturated magnetic flux density than the magnetic particle.

6. A magnet which is fabricated by molding a magnetic material, wherein the magnetic material is including magnetic particles including a rare earth element, a fluorine compound including an alkaline earth element or a rare earth element is formed on a surface of the magnetic particles, and an oxygen concentration of the fluorine compound is higher than an oxygen concentration of the magnetic particle.

7. A rotating machine comprising a rotor having a magnet and a stator having a coil and the magnet is fabricated by molding a magnetic material, wherein the magnetic material is including magnetic particles including a rare earth element, a fluorine compound including an alkaline earth element or a rare earth element is formed on a surface of the magnetic particles, and an oxygen concentration of the fluorine compound is higher than an oxygen concentration of the magnetic particle.

8. A magnetic material is including magnetic particles including a rare earth element, wherein a fluorine compound including an alkaline earth element or a rare earth element is formed on a surface of the magnetic particles, and the fluorine compound is including a Fe element near an interface between the fluorine compound and the magnetic particle on which the fluorine compound is formed.

9. A magnetic material according to claim 8, wherein the magnetic particle includes Nd, Fe, and B elements.

10. A magnetic material according to claim 8, wherein the magnetic particle includes Sm and Co elements.

11. A magnetic material according to claim 8, wherein the fluorine compound includes at least one type of element selected from the group consisting of the Li, Mg, Ca, Sc, V, Cr, Mn, Fe, Co, Ni, Zn, Al, Ga, Sr, Y, Zr, Nb, Ag, In, Sn, Ba, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Pb, and Bi elements.

12. A magnet which is fabricated by molding a magnetic material, wherein the magnetic material is including magnetic particles including a rare earth element, a fluorine compound including an alkaline earth element or a rare earth element is formed on a surface of the magnetic particles, and the fluorine compound is including a Fe element near an interface between the fluorine compound and the magnetic particle.

13. A rotating machine comprising a rotor having a magnet and a stator having a coil and the magnet is fabricated by molding a magnetic material, wherein the magnetic material is including magnetic particles including a rare earth element, a fluorine compound including an alkaline earth element or a rare earth element is formed on a surface of the magnetic particles, and the fluorine compound is including a Fe element near an interface between the fluorine compound and the magnetic particle.

14. A magnetic material is including magnetic particles including a rare earth element, wherein a fluorine compound including an alkaline earth element or a rare earth element is formed on a surface of the magnetic particles, and an concentration of the rare earth element included in the magnetic particle in the fluorine compound is higher than an concentration of the rare earth element included in the magnetic particle in the magnetic particle near an interface between the magnetic particle and the fluorine compound.

15. A magnetic material according to claim 14, wherein the magnetic particle includes Nd, Fe, and B elements.

16. A magnetic material according to claim 14, wherein the magnetic particle includes Sm and Co elements.

17. A magnetic material according to claim 14, wherein the fluorine compound includes at least one type of element selected from the group consisting of the Li, Mg, Ca, Sc, V, Cr, Mn, Fe, Co, Ni, Zn, Al, Ga, Sr, Y, Zr, Nb, Ag, In, Sn, Ba, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Pb, and Bi elements.

18. A magnetic material according to claim 14, wherein a layer is formed near the interface between the fluorine compound and the magnetic particle on which the fluorine compound is formed, the layer has a higher saturated magnetic flux density than the magnetic particle.

19. A magnet which is fabricated by molding a magnetic material, wherein the magnetic material is including magnetic particles including a rare earth element, a fluorine compound including an alkaline earth element or a rare earth element is formed on a surface of the magnetic particles, and an concentration of the rare earth element included in the magnetic particle in the fluorine compound is higher than an concentration of the rare earth element included in the magnetic particle in the magnetic particle near an interface between the magnetic particle and the fluorine compound.

20. A rotating machine comprising a rotor having a magnet and a stator having a coil and the magnet is fabricated by molding a magnetic material, wherein the magnetic material is including magnetic particles including a rare earth element, a fluorine compound including an alkaline earth element or a rare earth element is formed on a surface of the magnetic particles, and an concentration of the rare earth element included in the magnetic particle in the fluorine compound is higher than an concentration of the rare earth element included in the magnetic particle in the magnetic particle near an interface between the magnetic particle and the fluorine compound.