Iron-based amorphous alloys with high saturation magnetic induction and strong amorphous-forming ability

Abstract

The invention relates to a Fe-based amorphous alloy. The percentage content of Fe atoms in the Fe-based amorphous alloy ranges from 81.8 to 84.3, and the Fe-based amorphous alloy has a saturation magnetic induction intensity being larger than or equal to 1.61 T, and / or a coercive force being less than or equal to 5 A / m. The formula of the Fe-based amorphous alloy is FeSiB<c>P<d>C<e>M<f>, wherein M is one or more inevitable impurity elements in the raw materials; a, b, c, d, e and f respectively represent the atom percentage contents of all the corresponding components; and the sum of a, b, c, d, e and f is 100. The Fe-based amorphous alloy has the advantages of high saturation magnetic induction intensity and other good magnetic properties on the premise of meeting the requirement of strong amorphous forming ability for preparation of wide-width strips through planar flow casting and rapid quenching. The maximal thickness of an alloy wide-width strip sample reaches 81 [mu]m. In addition, the alloy does not contain nonmagnetic metallic elements, is suitable for being produced by industrial-purity raw materials, is simple in preparation method, and has the advantage of low manufacturing cost. The alloy strip sample has very good ductility before and after heat treatment, and can be folded by 180 degrees without fracture when reaching the optimal magnetic property.

Description

technical field [0001] The invention belongs to the field of amorphous soft magnetic alloys in functional materials, in particular to iron-based amorphous soft magnetic alloy materials with high saturation magnetic induction. Background technique [0002] Since its appearance in 1967, amorphous soft magnetic alloys have attracted great attention immediately, and have become one of the hotspots in material research in recent decades. The formation process of the amorphous soft magnetic alloy is to rapidly cool the molten metal liquid by the method of rapid quenching, so that the atoms have no time to move and rearrange and are frozen, and the disordered arrangement structure of the molten state is maintained. Due to the irregular arrangement of atoms, no periodicity, and the existence of no grain boundaries, there are few pinning points or pinning lines of magnetic domains, and the magnetic crystal anisotropy is very small, so it shows good soft magnetic properties: coercive ...

AI Technical Summary

Problems solved by technology

[0008] U.S. Patent No. 4,226,619 discloses an amorphous Fe-B-C alloy whose saturation magnetic induction exceeds 1.7T. The typical composition is Fe 86 B 7 C 7 The saturation magnetic induction of the alloy reaches 1.74T, but due to the low amorphous forming ability, the high coercive force of the alloy, and the high brittleness of the quenched strip, it cannot be practically popularized and applied.

[0009] Hitachi Metals discloses a Fe-Si-B-C alloy in the CN1721563A patent, its saturation magnetic induction reaches 1.64T, but its preparation process uses a carburizing process, which greatly increases the complexity of the process

[0010] In the patent CN1356403A, Nippon Steel Corporation announced a Fe-Si-B-C-P amorphous alloy with high iron content. The iron content is between 82-90%, and its saturation magnetic induction reaches 1.75T. However, due to excessive pursuit of saturation magnetic induction , ignoring the limitation of amorphous forming ability, the design of alloy composition is unreasonable

Its typical high iron content components such as Fe 86.7 Si 2.3 B 8.9 C 0.8 P 1.1 The amorphous formation ability of etc. is too low, and the completely amorphous sample cannot be prepared by the conventional rapid quenching process, and the magnetic properties are poor.

Its typical low iron content components such as Fe 82.4 Si 2.3 B 8.8 C 0.5 P 5.8 The content of P element in the alloy is high, and the saturation magnetic induction is low

In addition, the saturation magnetic induction value of the example in this patent is significantly higher than the normal value, indicating that the alloy has limited amorphous formation ability and the sample is not completely amorphous.

[0011] Nippon Steel Corporation discloses another Fe-Si-B-C-P amorphous alloy with low iron content in the patent CN101589169A, the iron content of the alloy is between 78-86%, but the P content of the alloy 6-20% is significantly reduced The saturation magnetic induction of the alloy, in addition, too high P content and C content have greatly increased the difficulty of alloy melting and the requirements of the strip making process

[0012] Antai Technology Co., Ltd. announced a high saturation magnetic induction amorphous alloy in the patent CN101840764A. Its preferred component silicon content is higher, exceeding 5%, and its ability to form amorphous is low. In addition, in the examples of this patent, there are similar components with different The saturation magnetic induction values ​​of the alloys vary greatly, indicating that the alloys of this composition have poor repeatability in the preparation process, resulting in large differences in the proportion of amorphous states in different alloy samples with similar compositions.

[0013] U.S. Patents US5958153A and US5626690 disclose a kind of (FeSiBC) with high amorphous forming ability 100-x P x Alloy, its critical thickness is between 40-90μm, but the iron content of the alloy is low, and the saturation magnetic induction is low

[0014] In summary, the current market lacks iron-based amorphous soft magnetic alloys and their products with high saturation magnetic induction and strong amorphous forming ability, and needs to develop high saturation magnetic induction, strong amorphous forming ability, low production cost and Iron-based amorphous soft magnetic alloy with excellent magnetic properties

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