Soft magnetic molded body, magnetic core, and magnetic sheet
A soft magnetic molded body, in which a binder component is used to bind a soft magnetic metal powder that has a flat shape, includes 60% by volume or more of the soft magnetic metal powder and 10-30% by volume of fine open pores. The binder component includes an inorganic oxide as a main component.
1. A soft magnetic formed body in which a binder component binds soft magnetic metal particles each having a flat shape, wherein:
the soft magnetic metal particles are at least 60 volume % of the soft magnetic formed body;
open pores are between 10 volume % and 30 volume %, both inclusive, of the soft magnetic formed body;
the binder component includes an inorganic oxide as a principal component thereof; and
the open pores are connected to one another to open outward of the soft magnetic formed body.
2. The soft magnetic formed body as recited in claim 1 , wherein:
the soft magnetic formed body includes one or more masses of particles;
each of the one or more masses of particles includes a plurality of the soft magnetic metal particles; and
a part of the binder component planarly spreads to bind an upper surface or a lower surface of one of the soft magnetic metal particles included in one of the masses of particles to a lower surface or an upper surface of another one of the soft magnetic metal particles included in the one of the masses of particles.
3. The soft magnetic formed body as recited in claim 2 , wherein another part of the binder component is granulously combined to bind, with a gap, one of the soft magnetic metal particles included in one of the masses of particles to one of the soft magnetic metal particles which is not included in the one of the masses of particles.
4. The soft magnetic formed body as recited in claim 1 , wherein:
two or more of the soft magnetic metal particles that are vertically adjacent to one another are first soft magnetic metal particles which form a mass of particles;
the soft magnetic formed body includes one or more of the masses of particles; and
two of the first soft magnetic metal particles that are vertically adjacent to each other are bound to each other by the binder component so as to extend in parallel to each other with a gap which is smaller than a thickness of each of the two of the first soft magnetic metal particles that are vertically adjacent to each other.
5. The soft magnetic formed body as recited in claim 4 , wherein one of the masses of particles is bound to another one of the masses of particles or to a second soft magnetic metal particle so as to form one of the open pores therebetween, the second soft magnetic metal particle being a soft magnetic metal particle that is not included in any of the masses of particles.
6. The soft magnetic formed body as recited in claim 1 , wherein a surface of the soft magnetic formed body is, at least in part, coated with a resin or a glass material.
7. The soft magnetic formed body as recited in claim 6 , wherein the open pores are, at least in part, filled with a resin or a glass material.
8. The soft magnetic formed body as recited in claim 1 , wherein the open pores are, at least in part, impregnated with a solution including an inorganic material and subjected to heat-treatment, so that the open pores are, at least in part, filled with an inorganic oxide different from the inorganic oxide that is included in the soft magnetic formed body prior to impregnation with the solution including the inorganic material.
9. A magnetic core made of the soft magnetic formed body as recited in claim 1 .
10. A magnetic sheet made of the soft magnetic formed body as recited in claim 1 .