High saturation induction density iron-based nanocrystalline magnetically soft alloy material and preparation method thereof

Abstract

The invention relates to a high saturation induction density iron-based nanocrystalline magnetically soft alloy material and a preparation method thereof. According to the scheme provided by the invention, the alloy material consists of the following chemical components in percentage by atom: 72.5-76.5 percent of Fe, 9-12 percent of Si, 9-9.6 percent of B, 0.8-1.2 percent of Cu, 0.3-0.5 percent of Co, 1.5-2 percent of Mo, 0.8-1.5 percent of Cr, 1-2 percent of P, 0.002-0.06 percent of Y and other inevitable impurities. The preparation method of the alloy material comprises the following steps of: preparing the chemical components according to the percentage by atom, mixing uniformly, and smelting and casting in vacuum to obtain a master alloy ingot; remelting the master alloy ingot, and spraying into an amorphous belt material with a single roll melt-spinning method; and performing thermal treatment to obtain the high saturation induction density iron-based nanocrystalline magnetically soft alloy material. The method has the characteristics of low production cost and easiness in realizing a thermal treatment process; and the product has high saturation induction density, low coercive force and a wide application range, and is particularly suitable for the fields of transformers and mutual inductors.

Description

technical field [0001] The invention belongs to the technical field of iron-based nanocrystalline soft magnetic alloys, in particular to an iron-based nanocrystalline soft magnetic alloy material with high saturation magnetic induction and a preparation method thereof. Background technique [0002] Iron-based nanocrystalline soft magnetic alloy material is a new type of soft magnetic material developed in the late 1980s. This material has aroused great interest of material scientists for its special comprehensive soft magnetic properties. In 1988, Japanese scholar Yoshizawa et al added a small amount of Cu (where Cu does not exceed 1at%) and M (M=Nb, Ta, Mo, W, etc.) After the annealing treatment at the initial crystallization temperature, a certain volume fraction of nanocrystalline grains precipitates in the alloy matrix, and the grain size is about 10nm, which can be called "the third-generation soft magnetic material". In its patent (Zhao 64-31922) technology, nanocryst...

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Problems solved by technology

However, the alloy has strict requirements on raw material composition control, and the purity of each raw material must be greater than 99%, and the preparation conditions are strict. The smelting and strip making processes must be carried out under the protection of inert gas. At the same time, the heat treatment process requires strict requirements. The time is only 2-4 minutes, which is difficult to achieve in industrial production, so it also greatly limits its application

[0007] Although amorphous / nanocrystalline alloys have many excellent soft magnetic properties compared with other soft magnetic materials, they also have many defects that limit their promotion and application.

The problems are mainly manifested in the following aspects: ①Compared with silicon steel, the saturation magnetic induction is lower, which limits the application of amorphous alloys in transformers; ②General amorphous / nanocrystalline alloys contain a large amount of metal Nb, The cost of metal Nb accounts for 60~70% of the total cost of alloy raw materials, which increases the cost; ③The annealing temperature range is relatively narrow, and the heat treatment process is demanding