The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 29, 2015
Filed:
Jan. 20, 2010
Motoki Ohta, Osaka, JP;
Yoshihito Yoshizawa, Osaka, JP;
Motoki Ohta, Osaka, JP;
Yoshihito Yoshizawa, Osaka, JP;
HITACHI METALS, LTD., Tokyo, JP;
Abstract
A method for producing a soft magnetic alloy ribbon having a composition represented by FeABX, wherein A is Cu and/or Au, X is at least one element selected from the group consisting of Si, S, C, P, Al, Ge, Ga and Be, and x, y and z are numbers (by atomic %) meeting the conditions of 0<x≦5, 10≦y≦22, 1≦z≦10, and x+y+z≦25, and comprising a matrix phase in which fine crystal grains having an average diameter of 60 nm or less are dispersed at a volume fraction of 50% or more, part of an oxide film formed on the surface being a layer having a lower B concentration than the average B concentration of the matrix phase; comprising the steps of (1) ejecting an alloy melt having the above composition onto a rotating cooling roll for quenching, to form a primary fine-crystalline alloy ribbon having a matrix phase, in which fine crystal nuclei having an average diameter of 30 nm or less are dispersed at a volume fraction of more than 0% and less than 30% in an amorphous phase; and then (2) annealing the primary fine-crystalline alloy ribbon in an atmosphere having an oxygen concentration of 6-18%.