Cobalt-base block amorphous soft magnetic alloy with high amorphous forming ability and preparation method thereof

Abstract

The invention provides a cobalt-base block amorphous soft magnetic alloy with high amorphous forming ability and a preparation method thereof. The molecular formula of the amorphous soft magnetic alloy is CoaFebNicBdSieNb5, in which a, b, c, d and e are atomic percents, wherein a is larger than or equal to 25 and smaller than or equal to 60, b is larger than or equal to 10 and smaller than or equal to 28, c is larger than or equal to 2 and smaller than or equal to 10, d is larger than 0, e is larger than 0, d+e is larger than or equal to 14 and smaller than or equal to 39, and a+b+c+d+e+5 is equal to 100. Compared with the prior art, the alloy material has the advantages of high amorphous forming ability, excellent soft magnetic property and mechanical property, the reduced glass transition temperature of the alloy material reaches 0.5-0.7, the coercive force of the alloy material reaches below 1.5A / m, the rupture strength of the alloy material is larger than 4200MPa, and the alloy material can be prepared into amorphous bars with the diameters of 1mm-7mm due to the high amorphous forming ability; therefore, the alloy material can be widely applied in the fields of transformers, magnetic sensors and the like, and has good application prospect.

Description

technical field [0001] The invention relates to the technical field of amorphous alloys, in particular to a cobalt-based bulk amorphous soft magnetic alloy with high amorphous forming ability and a preparation method thereof. Background technique [0002] Amorphous metal alloys are a type of alloy with short-range order and long-range disorder structure characteristics. Compared with crystalline alloys, they have excellent mechanical properties, good processing performance, and better resistance to corrosion by various media. As well as physical properties such as excellent magnetic properties and unique expansion characteristics, it has shown important application value in aerospace devices, precision machinery, power electronics and other fields, and has broad application prospects. [0003] Since 1960, Duwez et al reported the rapid cooling of Au by spray gun 75 Si 25 Since amorphous alloys, people have obtained amorphous alloys in many metal alloy systems by using liqu...

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Problems solved by technology

However, due to the low amorphous formation ability of cobalt-based amorphous alloys, it can only be prepared by inner circle water spinning, which limits the large-scale preparation of high-quality amorphous wires, thus improving the amorphous formation of cobalt-based amorphous alloys. ability becomes more important

[0006] In 2001, Shen Baolong and others prepared a bulk amorphous alloy with a supercooled liquid phase region of 70K and excellent soft magnetic properties by adding Ta element on the basis of Co-Fe-B alloy. The saturation magnetic induction is 0.5T, the effective permeability at 1kHz is 40000, the coercive force of the ring sample is 0.25A / m, and the maximum permeability is 5.5×10 5 , however, the critical dimension of its amorphous rod is only 2mm, and the ability to form amorphous is still weak

In 2006, Shen Baolong and others successfully developed the molecular formula [(Co 1-x Fe x ) 0.75 B 0.2 Si 0.05 ]Nb 4 (x=0.1-0.4) bulk amorphous alloy material with excellent soft magnetic properties, its critical size reaches 4mm, saturation magnetic induction is 0.71-0.97T, coercive force is 0.7-1.8A / m, under 1kHz The effective magnetic permeability is 1.48-3.25×10 4 , but the alloy components with strong amorphous forming ability in this system have relatively poor soft magnetic properties, while the alloy components with excellent soft magnetic properties have poor amorphous forming ability

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