Alloy powder and magnetic component
Alloy powder of a composition formula Fe 100-a-b-c-d-e-f Co a B b Si c P d Cu e C f having an amorphous phase as a main phase is provided. Parameters satisfy the following conditions: 3.5≤a≤4.5 at %, 6≤b≤15 at %, 2≤c≤11 at %, 3≤d≤5 at %, 0.5≤e≤1.1 at %, and 0≤f≤2 at %. With this composition, the alloy powder has good magnetic characteristics even when it has a large particle diameter such as 90 μm. Therefore, yield thereof is improved.
1. An alloy powder of a composition formula Fe 100-a-b-c-d-e-f Co a B b Si c P d Cu e C f having, as a main phase, an amorphous phase or a mixed phase structure of the amorphous phase and a crystal phase of α-Fe, wherein:
72.1≤100-a-b-c-d-e-f,
3.5≤a≤4.5 at %,
6≤b≤15 at %,
2≤c≤11 at %,
3≤d≤5 at %,
0.5≤e≤1.1 at %,
0≤f≤2 at %, and
the alloy powder has a particle diameter of 90 μm or less and an Fe crystallinity of 25% or lower.
2. The alloy powder as recited in claim 1 , wherein 72.1≤100-a-b-c-d-e-f≤83.5 at %.
3. A magnetic component formed using the alloy powder as recited in claim 2 .
4. The alloy powder as recited in claim 1 , wherein 72.1≤100-a-b-c-d-e-f≤79 at %.
5. A magnetic component formed using the alloy powder as recited in claim 4 .
6. The alloy powder as recited in claim 1 , wherein the alloy powder has saturation magnetic flux density of 1.6 T or more and coercive force of 100 A/m or less.
7. A magnetic component formed using the alloy powder as recited in claim 6 .
8. The alloy powder as recited in claim 1 , wherein 6≤b<10 at %.
9. A magnetic component formed using the alloy powder as recited in claim 8 .
10. The alloy powder as recited in claim 1 , wherein 0.5≤e≤1 at %.
11. A magnetic component formed using the alloy powder as recited in claim 10 .
12. The alloy powder as recited in claim 1 , wherein the Fe crystallinity is 21% or lower.
13. A magnetic component formed using the alloy powder as recited in claim 12 .
14. The alloy powder as recited in claim 1 , wherein:
6≤b<10 at %,
2<c≤11 at %,
0.5≤e≤1 at %, and
the Fe crystallinity is 21% or lower.
15. A magnetic component formed using the alloy powder as recited in claim 14 .
16. A magnetic component formed using the alloy powder as recited in claim 1 .