Dust core compound, molded body, and dust core
A compound for dust core includes a metal powder including iron, a resin composition, and a metal salt, in which the metal salt is represented by R 2 M, R represents a saturated fatty acid group having 6 or more and 12 or less carbon atoms, and M represents at least one metal element between Ca and Ba.
1. A compound for dust core, comprising:
a metal powder including iron;
a resin composition; and
a metal salt,
wherein the metal salt is represented by R 2 M,
the R represents a saturated fatty acid group having 6 or more and 10 or less carbon atoms,
M represents at least one metal element between Ca and Ba,
the metal powder consists of only at least one selected from the group consisting of simple substance of iron and an alloy including iron,
at least a portion of the surface of a portion or all of metal particles constituting the metal powder is covered with the resin composition,
the resin composition includes at least one resin selected from the group consisting of an epoxy resin, a bismaleimide resin, a polyimide resin, and a polyphenylene sulfide resin, and
a sum of masses of the epoxy resin, the bismaleimide resin, the polyimide resin, and the polyphenylene sulfide resin is 0.01 parts by mass or more and 1.00 parts by mass or less with respect to 100 parts by mass of the metal powder.
2. The compound for dust core according to claim 1 ,
wherein the resin composition includes a bismaleimide resin.
3. The compound for dust core according to claim 2 ,
wherein the bismaleimide resin is a thermosetting resin powder.
4. The compound for dust core according to claim 2 ,
wherein the bismaleimide resin includes an addition reaction product of a polymaleimide and an aminophenol.
5. The compound for dust core according to claim 4 ,
wherein a proportion by mass of the aminophenol is 5 to 40 parts by mass with respect to 100 parts by mass of the polymaleimide.
6. The compound for dust core according to claim 4 ,
wherein a content of the addition reaction product in the bismaleimide resin is 30 to 80% by mass.
7. The compound for dust core according to claim 2 ,
wherein the bismaleimide resin includes an epoxy compound and an addition reaction product of a polymaleimide and an aminophenol.
8. The compound for dust core according to claim 1 , comprising:
a first powder consisting of only the metal powder and the resin composition; and
a second powder consisting of only the metal salt.
9. A green compact comprising:
the compound for dust core according to claim 1 .
10. The green compact according to claim 9 ,
the metal salt is dispersed in the green compact.
11. The green compact according to claim 9 ,
wherein the green compact has an annular shape or a tubular shape.
12. A dust core formed from the compound for dust core according to claim 1 .
13. The dust core according to claim 12 ,
the metal salt is dispersed in the dust core.
14. The dust core according to claim 12 ,
wherein the dust core has an annular shape or a tubular shape.
15. The dust core according to claim 12 ,
wherein the metal salt exists in the vicinity of the surface of the dust core.
16. The compound for dust core according to claim 1 ,
wherein the resin composition includes a polyimide resin.
17. The compound for dust core according to claim 16 ,
wherein the polyimide resin is a thermoplastic resin powder.
18. The compound for dust core according to claim 1 ,
wherein the resin composition includes a polyphenylene sulfide resin.
19. The compound for dust core according to claim 18 ,
wherein the polyphenylene sulfide resin is a thermoplastic resin powder.
20. The compound for dust core according to claim 1 , comprising:
a first powder consisting of only the metal powder and the resin composition; and
a second powder consisting of only the metal salt and a wax different from the metal salt.
21. The compound for dust core according to claim 1 ,
wherein the compound is obtained by mixing:
a first powder consisting of only the metal powder and the resin composition; and
a second powder consisting of only the metal salt and a wax different from the metal salt.
22. The compound for dust core according to claim 1 ,
wherein the compound is obtained by mixing:
a first powder consisting of only the metal powder and the resin composition; and
a second powder consisting of only the metal salt.
23. The compound for dust core according to claim 1 ,
wherein a particle size of the metal powder is 60 μm or more and 150 μm or less.
24. The compound for dust core according to claim 1 ,
wherein a sum of the mass of the metal salt is 0.01 parts by mass or more and 0.70 parts by mass or less with respect to 100 parts by mass of the metal powder.
25. The compound for dust core according to claim 1 ,
wherein the resin composition further includes at least one component selected from the group consisting of a curing agent, a coupling agent, a curing accelerator, a flame retardant, and a wax.