The purpose of the present invention is to provide a method for producing boron nitride nanotubes, said method reducing the ratio of by-products having less reinforcing effects such as boron nitride fullerenes and boron nitride thin pieces, while enhancing the yield at the same time, without requiring a thermal oxidation treatment.?The present invention provides a method for producing boron nitride nanotubes, said method being characterized by comprising: a step for obtaining a suspension by mixing a starting material that contains boron nitride nanotubes, a nonionic polymer dispersant having an sp3-bonded CH group, and an organic solvent; and a step for obtaining a dispersion liquid containing boron nitride nanotubes by subjecting the thus-obtained suspension to centrifugal separation, thereby removing by-products contained in the starting material.
Provided is an Fe-based amorphous alloy ribbon having reduced core loss under conditions of a magnetic flux density of 1.45 T. One embodiment of the present disclosure is an Fe-based amorphous alloy ribbon. At least one surface of this Fe-based amorphous alloy ribbon has multiple laser irradiation marks that are linear and consecutive. The linear laser irradiation marks are disposed along the direction perpendicular to the casting direction of the Fe-based amorphous alloy ribbon. The linear laser irradiation marks have surface irregularities and when the irregularities are evaluated in the casting direction, the difference HL between the highest point and the lowest point in the direction of thickness of the Fe-based amoprhous alloy ribbon is 0.25 to 2.0 µm.
B21C 51/00 - Dispositifs de mesure, de calibrage, d'indication, de comptage ou de marquage, spécialement conçus pour être utilisés dans la production ou la manipulation des matériaux concernés par les sous-classes
C21D 9/52 - Traitement thermique, p. ex. recuit, durcissement, trempe ou revenu, adapté à des objets particuliersFours à cet effet pour fils métalliquesTraitement thermique, p. ex. recuit, durcissement, trempe ou revenu, adapté à des objets particuliersFours à cet effet pour bandes métalliques
C22C 45/02 - Alliages amorphes avec le fer comme constituant majeur
H01F 1/153 - Alliages métalliques amorphes, p. ex. métaux vitreux
H01F 27/245 - Noyaux magnétiques fabriqués à partir de tôles, p. ex. à grains orientés
H01F 41/02 - Appareils ou procédés spécialement adaptés à la fabrication ou à l'assemblage des aimants, des inductances ou des transformateursAppareils ou procédés spécialement adaptés à la fabrication des matériaux caractérisés par leurs propriétés magnétiques pour la fabrication de noyaux, bobines ou aimants
3.
FE-BASED AMORPHOUS ALLOY RIBBON, PRODUCTION METHOD THEREOF, IRON CORE, AND TRANSFORMER
Provided is an Fe-based amorphous alloy ribbon having reduced iron loss in magnetic flux density conditions of 1.45 T, little deformation, and high productivity. This Fe-based amorphous alloy ribbon has a first surface and a second surface. The Fe-based amorphous alloy ribbon has a plurality of continuous linear laser irradiation marks on at least the first surface. The linear laser irradiation marks are provided in a direction orthogonal to the casting direction of the Fe-based amorphous alloy ribbon. The linear laser irradiation marks have uneven surface and, when the unevenness is evaluated from the casting direction, the height difference HL × width WA is 6.0180 µm2, as calculated from the height difference HL between the highest point and the lowest point in the thickness direction of the Fe-based amorphous alloy ribbon and the width WA, which is the length of the linear laser irradiation marks, in the casting direction, on the first surface.
B21C 51/00 - Dispositifs de mesure, de calibrage, d'indication, de comptage ou de marquage, spécialement conçus pour être utilisés dans la production ou la manipulation des matériaux concernés par les sous-classes
C21D 9/52 - Traitement thermique, p. ex. recuit, durcissement, trempe ou revenu, adapté à des objets particuliersFours à cet effet pour fils métalliquesTraitement thermique, p. ex. recuit, durcissement, trempe ou revenu, adapté à des objets particuliersFours à cet effet pour bandes métalliques
C22C 45/02 - Alliages amorphes avec le fer comme constituant majeur
H01F 1/153 - Alliages métalliques amorphes, p. ex. métaux vitreux
H01F 27/245 - Noyaux magnétiques fabriqués à partir de tôles, p. ex. à grains orientés
H01F 41/02 - Appareils ou procédés spécialement adaptés à la fabrication ou à l'assemblage des aimants, des inductances ou des transformateursAppareils ou procédés spécialement adaptés à la fabrication des matériaux caractérisés par leurs propriétés magnétiques pour la fabrication de noyaux, bobines ou aimants
4.
FE-BASED AMORPHOUS ALLOY RIBBON AND METHOD FOR PRODUCING SAME, IRON CORE, AND TRANSFORMER
One aspect of this invention provides an Fe-based amorphous alloy ribbon comprising a free solidification surface and a rolled surface, having a plurality of rows of laser irradiation marks, each comprising a plurality of laser irradiation marks, on the free solidification surface and/or the rolled surface. Of the plurality of rows of laser irradiation marks provided in the casting direction of the Fe-based amorphous alloy ribbon, the line interval, which is the interval between center lines in the central part in the width direction which intersects with the casting direction, between adjoining rows of laser irradiation marks, falls within the range of 10 mm to 60 mm, inclusive, and the spot interval, which is the interval between center points of a plurality of laser irradiation marks in each of the plurality of rows of laser irradiation marks falls within the range of 0.10 mm to 0.50 mm, inclusive. The numerical density D of laser irradiation marks (=(1/d1)×(1/d2), where d1 is the line interval and d2 is the spot interval) falls within the range of 0.05 marks/mm2 to 0.50 marks/mm2, inclusive.
brevets
