Magnetic powder and production method thereof, magnetic core and production method thereof, coil component and motor
A magnetic powder is represented by general formula Fe a Si b B c P d Cu e . 71.0≤a≤81.0, 0.14≤b/c≤5, 0≤d≤14, 0<e≤1.4, d≤0.8 a −50, e<−0.1( a +d)+10, and a+b+c+d+e=100. A crystallinity is not more than 30% in the case of containing an amorphous phase and a compound phase, and is not more than 60% in the case of not containing a compound phase. The magnetic powder is produced with a gas atomization method. Whereby, it is possible to obtain an alloy magnetic material which has high saturation magnetic flux density and low magnetic loss; and a magnetic core, coil components, and a motor can be realized.
1. A magnetic powder comprising a principal component represented by a general formula Fe a Si b B c P d Cu e ,
wherein the a, the b, the c, the d, and the e satisfy:
71.0≤ a≤ 81.0,
2.0≤ b≤ 9.0,
0.14≤ b/c≤ 5,
0≤ d≤ 14,
0< e≤ 1.4,
d≤ 0.8 a− 50,
e<− 0.1( a+d )+10, and
a+b+c+d+e= 100, and
further comprising at least an amorphous phase, and a crystalline phase consisting of a compound.
2. The magnetic powder according to claim 1 , wherein saturation magnetic flux density is not less than 1.30 T.
3. A magnetic core, wherein a principal component is formed of the magnetic powder according to claim 1 .
4. The magnetic core according to claim 3 , wherein the magnetic core contains a binder, and the content of the magnetic powder is not less than 60 vol % in terms of volume ratio.
5. A coil component in which a coil conductor is wound around a core part,
wherein the core part is formed of the magnetic core according to claim 4 .
6. A coil component in which a coil conductor is buried in a magnetic part,
wherein a principal component of the magnetic part is formed of the magnetic powder according to claim 1 .
7. The coil component according to claim 6 , wherein the magnetic part contains a binder, and
the content of the magnetic powder in the magnetic part is, in terms of volume ratio, not less than 60 vol % in terms of volume ratio.
8. A motor comprising
a stator core in which a plurality of armature teeth are spaced at regular intervals on the same circumference;
a coil conductor wound around the armature teeth; and
a rotor core arranged rotatably inside the stator core,
wherein a principal component of at least one of the stator core and the rotor core is formed of the magnetic powder according to claim 1 .
9. The magnetic powder according to claim 1 , wherein the b, the c, and the d further satisfy:
1.29≤ b/c≤ 5.00, and
6.0≤ d≤ 14.
10. The magnetic powder according to claim 1 , wherein the a, the b, the c, the d, and the e further satisfy:
74.7≤ a≤ 81.0,
4.0≤ b≤ 9.0,
1.9≤ c≤ 7.0,
7.5≤ d≤ 13.0, and
0.1≤ e≤ 1.3.
11. The magnetic powder according to claim 10 , wherein the a and the d further satisfy:
9.8≤0.8 a− 50≤14.8, and
0.6≤−0.1( a+d )+10≤1.7.
12. The magnetic powder according to claim 1 , wherein the b further satisfies:
2.0≤ b≤ 6.0.
13. A magnetic powder consisting essentially of:
a principal component represented by a general formula Fe a Si b B c P d Cu e ,
wherein the a, the b, the c, the d, and the e satisfy:
71.0≤ a≤ 81.0,
2.0≤ b≤ 9.0,
0.14≤ b/c≤ 5,
6.0≤ d≤ 14,
0≤ e≤ 1.4,
d≤ 0.8 a− 50,
e<− 0.1( a+d )+10, and
a+b+c+d+e= 100.
14. The magnetic powder according to claim 13 , wherein the a, the b, the c, the d, and the e further satisfy:
74.6≤ a≤ 81.0,
4.0≤ b≤ 6.0,
1.9≤ c≤ 7.0,
1.29≤ b/c≤ 5.00,
7.5≤ d≤ 13.0,
0.1≤ e≤ 1.3,
9.8≤0.8 a− 50≤14.8, and
0.6≤−0.1( a+d )+10≤1.7.