Heat treatment apparatus for laminated body of amorphous alloy ribbon and soft magnetic core
A heat treatment apparatus for a laminated body of amorphous alloy ribbon includes: a lamination jig that holds the laminated body of amorphous alloy ribbon; two heating plates that sandwich the laminated body from upper and lower surfaces in a lamination direction without coming into contact with the lamination jig; and a heating control apparatus that controls a heating temperature of the two heating plates.
1. A soft magnetic core comprising:
a laminated body of laminated Fe-based alloy ribbons,
wherein:
each of the laminated Fe-based alloy ribbons has a same shape and two or more holes;
the laminated Fe-based alloy ribbons have high crystallization percentage portions and low crystallization percentage portions that are less crystallized than the high crystallization percentage portions;
the high crystallization percentage portions overlap, and the low crystallization percentage portions overlap in a planar view of the laminated body; and
the low crystallization percentage portions are at an outside of the laminated body and the two or more holes, and the high crystallization percentage portions are at an inside of the laminated body.
2. The soft magnetic core according to claim 1 , further comprising low oxidized portions and high oxidized portions on a contact surface between the laminated Fe-based alloy ribbons in the laminated body.
3. The soft magnetic core according to claim 2 , wherein the low oxidized portions are surrounded by the high oxidized portions in an outer shape in the planar view of the laminated body.
4. The soft magnetic core according to claim 3 , wherein the laminated body has the low oxidized portions and the high oxidized portions by a heat treatment so that a degree of the heat treatment is visibly recognizable.
5. The soft magnetic core according to claim 2 , wherein:
the two or more holes are first holes;
each of the laminated Fe-based alloy ribbons has one second hole in a center thereof;
the second hole is larger than the first holes; and
in each of the laminated Fe-based alloy ribbons:
the high crystallization percentage portions are at an outer edge and around the second hole; and
the low crystallization percentage portions are between the outer edge and around the second hole.
6. The soil magnetic core according to claim 1 , wherein a volume fraction of crystals of the high crystallization percentage portions is 50% or more, and a volume fraction of crystals of the low crystallization percentage portions is less than 50%.
7. The soft magnetic core according to claim 1 , wherein all of the high crystallization percentage portions of the laminated Fe-based alloy ribbons overlap, and all of the low crystallization percentage portions of the laminated Fe-based alloy ribbons overlap.
8. The soft magnetic core according to claim 1 ; wherein:
the two or more holes are first holes;
each of the laminated Fe-based alloy ribbons has one second hole in a center thereof; and
the second hole is larger than the first holes.
9. The soft magnetic core according to claim 1 , wherein at least one of the two or more holes of each of the laminated Fe-based alloy ribbons is at a same position with respect to a laminate direction.
10. The soft magnetic core according to claim 1 , wherein, in each of the laminated Fe-based alloy ribbons:
the two or more holes are at an outer edge; and
the two or more holes are spaced at a same distance along a circumferential direction from each other.
11. The soft magnetic core according to claim 1 , wherein, in each of the laminated Fe-based alloy ribbons, each of the low crystallization percentage portions is connected from one of the two or more holes to an outer edge.