Magnetic-anisotropic plastically deformed body, method for producing the same, and electromagnetic apparatus using the same
View Patent ↗A material containing a soft magnetic substance is subjected to a plastic deformation such as a roll processing to obtain a rod-shaped body. Then, the rod-shaped body or a shaped body obtained by processing the rod-shaped body into a shape other than a flat plate shape is subjected to a heat treatment in the presence of a magnetic field. The rod-shaped body or the shaped body is made magnetic-anisotropic by the heat treatment thereby to obtain a magnetic-anisotropic plastically deformed body.
1. A magnetic-anisotropic plastically deformed body comprising a plastically deformed body obtained by plastic deformation of a single material containing a soft magnetic substance into a shape other than a flat plate shape, the plastically deformed body exhibiting a magnetic anisotropy.
2. The magnetic-anisotropic plastically deformed body according to claim 1 , having one magnetization easy axis oriented in an arbitrary direction, thereby exhibiting a uniaxial magnetic anisotropy.
3. The magnetic-anisotropic plastically deformed body according to claim 1 , having a crystal grain size corresponding to a grain size number of 3 to 9.
4. The magnetic-anisotropic plastically deformed body according to claim 1 , comprising a silicon steel or an Fe—Al alloy.
5. The magnetic-anisotropic plastically deformed body according to claim 1 , having a rod shape.
6. The magnetic-anisotropic plastically deformed body according to claim 1 , obtained by plastically deforming the single material and subjecting the deformed material to a heat treatment in the presence of a magnetic field.
7. A method for producing a magnetic-anisotropic plastically deformed body, the magnetic-anisotropic plastically deformed body comprising a soft magnetic substance and exhibiting a magnetic anisotropy, the method comprising the steps of:
plastically deforming a single material containing the soft magnetic substance to obtain a rod-shaped body; and
subjecting the rod-shaped body or a shaped body obtained by processing the rod-shaped body into a shape other than a flat plate shape, to a heat treatment in the presence of a magnetic field to achieve the magnetic anisotropy, thereby obtaining the magnetic-anisotropic plastically deformed body.
8. The method according to claim 7 , wherein the heat treatment is carried out within a temperature range from a recrystallization temperature to (the recrystallization temperature +100° C.)
9. The method according to claim 7 , wherein in the step of plastically deforming the single material, the single material is plastically deformed at a processing rate of 10% to 40%.
10. The method according to claim 7 , wherein the magnetic-anisotropic plastically deformed body has one magnetization easy axis oriented in an arbitrary direction and exhibits a uniaxial magnetic anisotropy.
11. The method according to claim 7 , wherein the magnetic field has an intensity of 0.5 T or more.
12. The method according to claim 7 , wherein the single material comprises a silicon steel or an Fe—Al alloy.
13. The method according to claim 7 , wherein the rod-shaped body is subjected to the heat treatment in the presence of the magnetic field, thereby to obtain the magnetic-anisotropic plastically deformed body having a rod shape.
14. An electromagnetic apparatus comprising a magnetic circuit, the magnetic circuit containing an electromagnetic coil for generating a magnetic field when the electromagnetic coil is energized, the magnetic field disappearing when the energization is stopped, and a soft magnetic member which is magnetized and demagnetized respectively by the generation and disappearance of the magnetic field,
wherein the soft magnetic member is a plastically deformed body obtained by plastic deformation of a single material containing a soft magnetic substance into a shape other than a flat plate shape, and the plastically deformed body is a magnetic-anisotropic plastically deformed body exhibiting a magnetic anisotropy.
15. The electromagnetic apparatus according to claim 14 , wherein the magnetic-anisotropic plastically deformed body has one magnetization easy axis and exhibits a uniaxial magnetic anisotropy.
16. The electromagnetic apparatus according to claim 14 , wherein the magnetic-anisotropic plastically deformed body has a crystal grain size corresponding to a grain size number of 3 to 9.
17. The electromagnetic apparatus according to claim 14 , wherein the magnetic-anisotropic plastically deformed body comprises a silicon steel or an Fe—Al alloy.
18. The electromagnetic apparatus according to claim 14 , wherein the magnetic-anisotropic plastically deformed body is obtained by plastically deforming the single material and subjecting the deformed material to a heat treatment in the presence of a magnetic field.
19. The electromagnetic apparatus according to claim 14 , wherein the electromagnetic apparatus is an electromagnetic valve having a fixed core and/or a movable core containing the magnetic-anisotropic plastically deformed body.
20. The electromagnetic apparatus according to claim 14 , wherein the electromagnetic apparatus is an electromagnetic valve having a housing containing the magnetic-anisotropic plastically deformed body.