Fe—Si—B—C-based amorphous alloy ribbon and transformer core formed thereby
View Patent ↗An Fe—Si—B—C-based amorphous alloy ribbon as thick as 20-30 μm having a composition comprising 80.0-80.7 atomic % of Fe, 6.1-7.99 atomic % of Si, and 11.5-13.2 atomic % of B, the total amount of Fe, Si and B being 100 atomic %, and further comprising 0.2-0.45 atomic % of C per 100 atomic % of the total amount of Fe, Si and B, except for inevitable impurities has a stress relief degree of 92% or more.
1. An Fe—Si—B—C-based amorphous alloy ribbon comprising:
an amorphous alloy having a composition comprising 80.0-80.7 atomic % of Fe, 6.1-7.99 atomic % of Si, and 11.5-13.2 atomic % of B, the total amount of Fe, Si and B constituting 100 atomic % of Fe, Si and B, and the composition further comprising an amount of C in an atomic ratio of 0.2-0.45 atomic % of C per 100 atomic % of the total amount of Fe, Si and B, except for inevitable impurities,
wherein the composition is represented by the following formula:
(FeSiB) 100 C 0.2-0.45 (atomic %), except for the inevitable impurities, and
wherein the Fe—Si—B—C-based amorphous alloy ribbon has a stress relief degree of 92% or more.
2. The Fe—Si—B—C-based amorphous alloy ribbon according to claim 1 , wherein the Fe—Si—B—C-based amorphous alloy ribbon has a thickness of 20-30 μm.
3. The Fe—Si—B—C-based amorphous alloy ribbon according to claim 1 , wherein the Fe—Si—B—C-based amorphous alloy ribbon has a thickness of 22-27 μm.
4. The Fe—Si—B—C-based amorphous alloy ribbon according to claim 1 , wherein the Fe—Si—B—C-based amorphous alloy ribbon has a width of 100 mm or more.
5. A transformer core formed by a laminate of an Fe—Si—B—C-based amorphous alloy ribbon having a composition comprising 80.0-80.7 atomic % of Fe, 6.1-7.99 atomic % of Si, and 11.5-13.2 atomic % of B, the total amount of Fe, Si and B constituting 100 atomic % of Fe, Si and B, and the composition further comprising an amount of C in an atomic ratio of 0.2-0.45 atomic % of C per 100 atomic % of the total amount of Fe, Si and B, except for inevitable impurities,
wherein the composition is represented by the following formula:
(FeSiB) 100 C 0.2-0.45 (atomic %), except for the inevitable impurities, and
wherein the Fe—Si—B—C-based amorphous alloy ribbon has a stress relief degree of 92% or more.
6. The transformer core according to claim 5 , wherein the Fe—Si—B—C-based amorphous alloy ribbon has a thickness of 20-30 μm.
7. The transformer core according to claim 5 , wherein the Fe—Si—B—C-based amorphous alloy ribbon has a thickness of 22-27 μm.
8. The transformer core according to claim 5 , wherein the Fe—Si—B—C-based amorphous alloy ribbon has a width of 100 mm or more.
9. The transformer core according to claim 5 , wherein the Fe—Si—B—C-based amorphous alloy ribbon has curved corners each having a radius of curvature of 2-10 mm.
10. The transformer core according to claim 5 , wherein the Fe—Si—B—C-based amorphous alloy ribbon has core loss of less than 0.20 W/kg at 50 Hz and 1.3 T.