High-magnetic-saturation-strength iron-based amorphous soft magnetic alloy and preparation method and application thereof

Abstract

The invention relates to an iron-based amorphous soft magnetic alloy, which is composed of FeaSibBcPdCue and trace unavoidable impurities, in which a is 83.2-83.6, b is 2.3-2.5, c is 12.2-12.3, and d is 1.2 ~1.5, e is 0.6~0.7, a+b+c+d+e=100, it has high saturation magnetic induction, low coercive force, high magnetic permeability and excellent corrosion resistance, and it has It has the characteristics of good formability, low production cost and simple process; the saturation magnetic induction intensity of the alloy can reach 1.81T-1.83T after stress relief annealing.

Description

technical field [0001] The invention belongs to the technical field of amorphous alloys, in particular to an iron-based amorphous soft magnetic alloy with high saturation magnetic induction, low coercive force, high magnetic permeability and excellent corrosion resistance and its application. Background technique [0002] Compared with traditional metal soft magnetic materials, iron-based amorphous soft magnetic alloys have excellent comprehensive soft magnetic properties, such as high saturation magnetic induction, high magnetic permeability, low coercive force, low core loss, and low excitation current And good stability, and the molding process is simple, without special processing technology, it is widely used in power electronic devices such as distribution transformers, intermediate frequency power transformers, filter reactors, saturable reactors, motor stators, and magnetic sensors. At present, with the development of high-frequency technology, people put forward hig...

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Problems solved by technology

[0003] Although the iron-based amorphous soft magnetic material has many excellent physical and chemical properties, it still has the following shortcomings compared with the silicon steel sheet widely used at present: (1) Compared with the silicon steel sheet (2.03T), the saturation magnetic induction exists There is a big gap. For example, the grade of iron-based amorphous alloys currently in industrial production is mainly Metglas2605SA1, and the composition is Fe 80 Si 9 B 11 (at%), its B s Only 1.56T (see Chinese patent CN101840764A), which limits the development of industrially produced amorphous transformers towards miniaturization, light weight, and energy saving; (2) The magnetic permeability is not high, and the magnetic permeability increases with the increase of operating frequency The index decreases and the high frequency stability is poor, so that the electronic devices under high frequency operation cannot be widely used, and the high initial permeability can effectively reduce the excitation current and excitation power applied to the soft magnetic material during use, thereby reducing Loss during the use of materials; (3) poor corrosion resistance, easy to rust in air or humid environment, resulting in rust spots, reducing its soft magnetic properties and industrial service life

Described in Chinese patent document CN101206943A a kind of expression is Fe a B b Si c Al d C e In terms of atomic percentage, a is 77-83at%, b is 7-13at%, c is 1-4at%, d is 3-6at%, e is 4-7at%, and its saturation magnetic induction can be Reach 1.380~1.760T; however, the addition of C (melting point 3555°C) element is difficult to alloy during the smelting process, which greatly increases the smelting cost

However, the preparation process of NANOMET alloy is complicated: the amorphous alloy is prepared first, and then undergoes a complex and harsh crystallization annealing process (requiring a heating rate of 400°C / min)

This is difficult to meet its requirements in the existing technology of industrial production

[0011] In summary, although the addition of alloying elements in the FeSiB system is beneficial to improve the glass forming ability and soft magnetic properties of FeSiB amorphous alloys, the magnetic permeability of iron-based amorphous alloys is low and the cost is high, which is difficult to meet the requirements of industrial production.

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