# US 12,002,607 B2 · Fe-based amorphous alloy ribbon and method for producing same, iron core, and transformer > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,002,607 B2 - Document ID: US12002607B2 - Status: Granted - Kind: B2 - Application number: 17/043,477 - Filed: 2019-03-29 - Published: 2021-02-25 - Granted: 2024-06-04 - Earliest claimed: 2018-03-30 - Assignees: Proterial, Ltd. - Applicants: Proterial, Ltd. - Inventors: Hajime Itagaki; Motoki Ohta; Morifumi Kuroki; Makoto Sasaki - Web page: https://patentgrep.com/patent/US12002607B2 ## CPC - H01F 1/15308: {based on Fe/Ni (H01F1/15325 takes precedence)} - C22C 45/02: with iron as the major constituent - H01F 1/15341: {Preparation processes therefor} - H01F 27/25: made from strips or ribbons (H01F27/26 takes precedence) - H01F 41/0226: {from amorphous ribbons} - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - C22C: ALLOYS (treatment of alloys C21D, C22F) ## Abstract One aspect of the invention provides an Fe-based amorphous alloy ribbon having a free solidified surface and a roll contact surface, in which the Fe-based amorphous alloy ribbon has plural laser irradiation mark rows each formed from plural laser irradiation marks on at least one surface of the free solidified surface or the roll contact surface, a line interval is from 10 mm to 60 mm, which is a centerline interval in a middle section in a width direction, between mutually adjacent laser irradiation mark rows, a spot interval is from 0.10 mm to 0.50 mm, which is an interval between center points of the plural laser irradiation marks in each of the plural laser irradiation mark rows, and the number density D (=(1/d1)×(1/d2), d1: line interval, d2: spot interval) of the laser irradiation marks is from 0.05 marks/mm2 to 0.50 marks/mm2. ## Claims ### Claim 1 An Fe-based amorphous alloy ribbon having a free solidified surface and a roll contact surface, wherein the Fe-based amorphous alloy ribbon has a plurality of laser irradiation mark rows each configured from a plurality of laser irradiation marks on at least one surface of the free solidified surface or the roll contact surface; and wherein the Fe-based amorphous alloy ribbon has: a line interval of from 30 mm to 60 mm, the line interval being defined as a centerline interval in a middle section in a width direction, between mutually adjacent laser irradiation mark rows of a plurality of such laser irradiation mark rows arranged in a casting direction of the Fe-based amorphous alloy ribbon, the width direction being orthogonal to the casting direction, a spot interval of from 0.10 mm to 0.50 mm, the spot interval being defined as an interval between center points of the plurality of laser irradiation marks in each of the plurality of laser irradiation mark rows, and a number density D of the laser irradiation marks of from 0.05 marks/mm2 to 0.50 marks/mm2, provided that the line interval is d1 (mm), the spot interval is d2 (mm), and the number density D of the laser irradiation marks is D=(1/d1)×(1/d2), and wherein the Fe-based amorphous alloy ribbon has an iron loss, under conditions of a frequency of 60 Hz and a magnetic flux density of 1.45 T, of 0.160 W/kg or less, and an exciting power, under conditions of a frequency of 60 Hz and a magnetic flux density of 1.45 T, of 0.200 VA/kg or less. ### Claim 2 (depends on 1) The Fe-based amorphous alloy ribbon according to claim 1, wherein a proportion of a length in the width direction of the laser irradiation mark rows in an entire length in the width direction of the Fe-based amorphous alloy ribbon is in a range of from 10% to 50% in each direction from the center in the width direction toward both ends in the width direction. ### Claim 3 (depends on 1) The Fe-based amorphous alloy ribbon according to claim 1, wherein the laser irradiation mark rows are formed at least in six middle regions in the width direction that are regions other than two regions at both ends of eight regions obtained by equally dividing the Fe-based amorphous alloy ribbon into eight parts in the width direction. ### Claim 4 (depends on 1) The Fe-based amorphous alloy ribbon according to claim 1, wherein the free solidified surface has a maximum cross-sectional height Rt of 3.0 μm or less. ### Claim 5 (depends on 1) The Fe-based amorphous alloy ribbon according to claim 1, consisting of Fe, Si, B, and impurities, wherein a content of Fe is 78 atom % or more, a content of B is 11 atom % or more, and a total content of B and Si is from 17 atom % to 22 atom % when a total content of Fe, Si, and B is 100 atom %. ### Claim 6 (depends on 1) The Fe-based amorphous alloy ribbon according to claim 1, having a thickness of from 20 μm to 35 μm. ### Claim 7 (depends on 1) The Fe-based amorphous alloy ribbon according to claim 1, consisting of Fe, Si, B, and impurities, wherein a content of Fe is 80 atom % or more, a content of B is 12 atom % or more, and a total content of B and Si is from 17 atom % to 20 atom % when a total content of Fe, Si, and B is 100 atom %. ### Claim 8 (depends on 1) The Fe-based amorphous alloy ribbon according to claim 1, having a magnetic flux density B0.1, under conditions of a frequency of 60 Hz and a magnetic field of 7.9557 A/m, of 1.52 T or more. ### Claim 9 (depends on 1) The Fe-based amorphous alloy ribbon according to claim 1, for use at an operating magnetic flux density Bm, wherein a ratio of operating magnetic flux density Bm/saturated magnetic flux density Bs, is from 0.88 to 0.94. ### Claim 10 (depends on 1) The Fe-based amorphous alloy ribbon according to claim 1, wherein each laser irradiation mark has a flat shape in a planar view, in which a ratio t1/T of a maximum depth t1 of a depressed portion of the laser irradiation mark to a thickness T of the Fe-based amorphous alloy ribbon is less than 0.025. ### Claim 11 (depends on 1) A method of producing the Fe-based amorphous alloy ribbon according to claim 1, comprising preparing a material ribbon comprising an Fe-based amorphous alloy and having a free solidified surface and a roll contact surface, and forming a plurality of laser irradiation mark rows each configured from a plurality of laser irradiation marks on at least one surface of the free solidified surface or the roll contact surface of the material ribbon, by laser processing, thereby obtaining the Fe-based amorphous alloy ribbon. ### Claim 12 (depends on 11) The method of producing an Fe-based amorphous alloy ribbon according to claim 11, wherein the laser irradiation marks are formed using a laser with a pulse energy of from 0.4 mJ to 2.5 mJ. ### Claim 13 (depends on 11) The method of producing an Fe-based amorphous alloy ribbon according to claim 11, wherein the laser irradiation marks are formed using a laser with a pulse width of laser for forming the laser irradiation marks of 50 nsec or more. ### Claim 14 (depends on 1) An iron core, comprising a layered Fe-based amorphous alloy ribbon that includes a plurality of the Fe-based amorphous alloy ribbons according to claim 1, and that is bent and wound in an overlapping manner, wherein the iron core has an iron loss, under conditions of a frequency of 60 Hz and a magnetic flux density of 1.45 T, of 0.250 W/kg or less. ### Claim 15 (depends on 1) A transformer, comprising an iron core that includes the Fe-based amorphous alloy ribbon according to claim 1, and a coil wound around the iron core, wherein the iron core is formed by layering the Fe-based amorphous alloy ribbon and bending and winding the layered Fe-based amorphous alloy ribbon in an overlapping manner, and has an iron loss of 0.250 W/kg or less, under conditions of a frequency of 60 Hz and a magnetic flux density of 1.45 T.