Fe-based amorphous alloy, powder core using the same, and coil encapsulated powder core
An Fe-based amorphous alloy of the present invention has a composition formula represented by Fe 100-a-b-c-x-y-z-t Ni a Sn b Cr c P x C y B z Si t , and in the formula, 1 at %≦a≦10 at %, 0 at %≦b≦3 at %, 0 at %≦c≦6 at %, 6.8 at %≦x≦10.8 at %, 2.2 at %≦y≦9.8 at %, 0 at %≦z≦4.2 at %, and 0 at %≦t≦3.9 at % hold. Accordingly, an Fe-based amorphous alloy used for a powder core and/or a coil encapsulated powder core having a low glass transition temperature (Tg), a high conversion vitrification temperature (Tg/Tm), and excellent magnetization and corrosion resistance can be manufactured.
1. An Fe-based amorphous alloy represented by a composition formula:
Fe 100-a-c-x-y-z-t Ni a Cr c P x C y B z Si t , wherein
an addition amount a of Ni satisfies 1 at %≦a≦10 at %,
an addition amount c of Cr satisfies 0 at %≦c≦3 at %,
an addition amount x of P satisfies 6.8 at %≦x≦10.8 at %,
an addition amount y of C satisfies 2.2 at %≦y≦9.8 at %,
an addition amount z of B satisfies 0 at %≦z≦4.2 at %, and
an addition amount t of Si satisfies 0 at %≦t≦3.9 at %,
and wherein the alloy has a glass transition temperature (Tg) equal to or lower than 710K.
2. The Fe-based amorphous alloy according to claim 1 , wherein the addition amount a of Ni is in a range of 4 to 6 at %.
3. The Fe-based amorphous alloy according to claim 1 , wherein the addition amount a of Ni is in a range of 6 to 10 at %.
4. The Fe-based amorphous alloy according to claim 1 , wherein the addition amount a of Ni is 6 at %.
5. The Fe-based amorphous alloy according to claim 1 , wherein the addition amount c of Cr is in a range of 0 to 2 at %.
6. The Fe-based amorphous alloy according to claim 5 , wherein the addition amount c of Cr is in a range of 1 to 2 at %.
7. The Fe-based amorphous alloy according to claim 1 , wherein the addition amount x of P is in a range of 8.8 to 10.8 at %.
8. The Fe-based amorphous alloy according to claim 1 , wherein the addition amount y of C is in a range of 5.8 to 8.8 at %.
9. The Fe-based amorphous alloy according to claim 1 , wherein the addition amount z of B is in a range of 0 to 2 at %.
10. The Fe-based amorphous alloy according to claim 9 , wherein the addition amount z of B is in a range of 1 to 2 at %.
11. The Fe-based amorphous alloy according to claim 1 , wherein the addition amount t of Si is in a range of 0 to 1 at %.
12. The Fe-based amorphous alloy according to claim 1 , wherein a total amount of the addition amount z of B and the addition amount t of Si is in a range of 0 to 4 at %.
13. The Fe-based amorphous alloy according to claim 1 , wherein
the addition amount z of B is in a range of 0 to 3 at %,
the addition amount t of Si is in a range of 0 to 2 at %, and
a total amount of the addition amount z of B and the addition amount t of Si is in a range of 0 to 3 at %.
14. The Fe-based amorphous alloy according to claim 1 , wherein (the addition amount t of Si)/(the addition amount t of Si+the addition amount x of P) is in a range of 0 to 0.36.
15. The Fe-based amorphous alloy according to claim 14 , wherein (the addition amount t of Si)/(the addition amount t of Si+the addition amount x of P) is in a range of 0 to 0.25.
16. The Fe-based amorphous alloy according to claim 1 , wherein the alloy has a conversion vitrification temperature (Tg/Tm) equal to or greater than 0.52, Tm being a temperature of a melting point of the alloy.
17. A powder core comprising:
a powder of the Fe-based amorphous alloy according to claim 1 ; and
a binding agent solidifying the powder.
18. A coil-encapsulating powder core comprising:
a powder core formed of a powder of the Fe-based amorphous alloy according to claim 1 and a binding agent solidifying the powder; and
a coil encapsulated in the powder core.
19. An Fe-based amorphous alloy represented by a composition formula:
Fe 100-a-c-x-y-z-t Ni a Cr c P x C y B z Si t , wherein
an addition amount a of Ni satisfies 1 at %≦a≦10 at %,
an addition amount c of Cr satisfies 0 at %≦c≦3 at %,
an addition amount x of P satisfies 6.8 at %≦x≦10.8 at %,
an addition amount y of C satisfies 2.2 at %≦y≦9.8 at %,
an addition amount z of B satisfies 0 at %≦z≦2 at %, and
an addition amount t of Si satisfies 0 at %≦t≦1 at %,
wherein a total amount of the addition amount z of B and the addition amount t of Si is in a range of 0 to 2 at %,
and wherein the alloy has a glass transition temperature (Tg) equal to or lower than 710K.