Abstract: This method of producing an amorphous transformer for electric power supply comprises forming and shaping an iron core by laminating amorphous alloy thin bands and forming a winding, subjecting the iron core, after forming and shaping, to an annealing treatment in which a temperature of a center portion of the iron core during annealing is 300 to 340° C. and a holding time is not less than 0.5 hr, and applying a magnetic field having a strength of not less than 800 A/m to the iron core while subjecting the iron core, after forming and shaping, to the annealing treatment.

Abstract: An Fe-based, primary, ultrafine crystalline alloy ribbon having a composition represented by the general formula of Fe100-x-y-z-a-bNixCuyNbzSiaBb, wherein x, y, z, a and b are numbers (atomic %) meeting the conditions of 4?x?6, 0.1?y?2, 0.1?z?4, 7?a?18, and 4?b?12; an as-cast structure in which fine crystal grains having a grain size distribution of 300 nm or less are dispersed in a proportion of more than 0% and 7% or less by volume in an amorphous matrix; and a thickness of 13-23 ?m.

Abstract: A magnetic core making use of an Fe-based amorphous alloy ribbon that simultaneously attains miniaturization and noise reduction through realization of high Bs; and an applied product making use of the same. There is provided a magnetic core making use of an Fe-based amorphous alloy ribbon, wherein the saturated magnetic flux density (Bs) of the Fe-based amorphous alloy ribbon is ?1.60 T and wherein the ratio between magnetic flux density at a core external magnetic field of 80 A/m (B80) and Bs of the Fe-based amorphous alloy ribbon, B80/Bs, is ?0.90.

Abstract: This method of producing an amorphous transformer for electric power supply comprises forming and shaping an iron core by laminating amorphous alloy thin bands and forming a winding, subjecting the iron core, after forming and shaping, to an annealing treatment in which a temperature of a center portion of the iron core during annealing is 300 to 340° C. and a holding time is not less than 0.5 hr, and applying a magnetic field having a strength of not less than 800 A/m to the iron core while subjecting the iron core, after forming and shaping, to the annealing treatment.

Abstract: This invention provides an amorphous transformer for electric power supply, using a magnetic core formed of an amorphous alloy material, which, as compared with the conventional amorphous alloy material, has a lower annealing temperature and a higher level of magnetic properties. The amorphous transformer for electric power supply is provided with a magnetic core of a thin band of an amorphous alloy and a winding wire. The iron core has been annealed under such conditions that the iron core center part temperature during annealing after iron core molding is 300 to 340° C. and the holding time is not less than 0.5 hr. Further, for the iron core, the magnetic field intensity during annealing after the iron core molding is not less than 800 A/m.

Abstract: A magnetic core making use of an Fe-based amorphous alloy ribbon that simultaneously attains miniaturization and noise reduction through realization of high Bs; and an applied product making use of the same. There is provided a magnetic core making use of an Fe-based amorphous alloy ribbon, wherein the saturated magnetic flux density (Bs) of the Fe-based amorphous alloy ribbon is ?1.60 T and wherein the ratio between magnetic flux density at a core external magnetic field of 80 A/m (B80) and Bs of the Fe-based amorphous alloy ribbon, B80/Bs, is ?0.90.

Abstract: A current transformer core made of an alloy having a composition represented by the general formula: Fe100-x-a-y-cMxCuaM?yX?c (by atomic %), wherein M is Co and/or Ni, M? is at least one element selected from the group consisting of V, Ti, Zr, Nb, Mo, Hf, Ta and W, X? is Si and/or B, and x, a, y and c are numbers satisfying 10?x?50, 0.1?a?3, 1?y?10, 2?c?30, and 7?y+c?31, respectively; at least part or all of the alloy structure being composed of crystal grains having an average particle size of 50 nm or less.

Abstract: An Fe-based amorphous alloy ribbon having a composition comprising FeaSibBcCd and inevitable impurities, wherein a is 80 to 83 atomic %, b is 0.1 to 5 atomic %, c is 14 to 18 atomic %, and d is 0.01 to 3 atomic %, the concentration distribution of C measured radially from both surfaces to the inside of said Fe-based amorphous alloy ribbon having a peak within a depth of 2 to 20 nm.

Abstract: A current transformer core made of an alloy having a composition represented by the general formula: Fe100-x-a-y-cMxCuaM?yX?c (by atomic %), wherein M is Co and/or Ni, M? is at least one element selected from the group consisting of V, Ti, Zr, Nb, Mo, Hf, Ta and W, X? is Si and/or B, and x, a, y and c are numbers satisfying 10?x?50, 0.1?a?3, 1?y?10, 2?c?30, and 7?y+c?31, respectively; at least part or all of the alloy structure being composed of crystal grains having an average particle size of 50 nm or less.

Abstract: An Fe-based amorphous alloy ribbon having a composition comprising FeaSibBcCd and inevitable impurities, wherein a is 76 to 83.5 atomic %, b is 12 atomic % or less, c is 8 to 18 atomic %, and d is 0.01 to 3 atomic %, the 5 concentration distribution of C measured radially from both surfaces to the inside of said Fe-based amorphous alloy ribbon having a peak within a depth of 2 to 20 nm.

Abstract: A magnetic core provided with a shape for a transformer by a cut-lap or step-lap method, which is constituted by an Fe-based amorphous alloy ribbon having excellent magnetic characteristics, which is represented by the general formula: FeaSibBcMx or FeaSibBcCdMx wherein M is Cr and/or Ni, a is 78 to 86 atomic %, b is 0.001 to 5 atomic %, c is 7 to 20 atomic %, x is 0.01 to 5 atomic %, and d is 0.001 to 4 atomic %, (a+b+c+x) or (a+b+c+d+x) being 100.