Magnetically soft alloy strip based on high-plasticity high silicon and manufacturing method of magnetically soft alloy strip

Abstract

The invention relates to a magnetically soft alloy strip based on high-plasticity high silicon. The magnetically soft alloy strip based on the high-plasticity high silicon is characterized in that the component expression of the magnetically soft alloy strip is FexSiaBb, wherein x, a and b are wt%, a is larger than or equal to 4 and smaller than or equal to 8, and b is larger than and equal to 0.001 and smaller than or equal to 2, and x+a+b is equal to 100%. According to the magnetically soft alloy strip based on the high-plasticity high silicon, a multi-slit nozzle and warm roller cooling plane flow casting method is used for manufacturing the strip, the manufactured magnetically soft alloy strip is 5 mm to 200 mm in strip width and 0.02 mm to 0.2 mm in strip thickness, the lamination coefficient is larger than 0.9, and the saturation flux density is larger than 1.8 T. The magnetically soft alloy strip is widely suitable for the fields of electric power, electronics, information, communication and the like.

Description

technical field [0001] The invention belongs to the field of magnetic functional materials, in particular to a soft magnetic alloy strip based on large plasticity and high silicon and a manufacturing method thereof. Background technique [0002] Electrical steel has excellent magnetic properties and is mainly used in the manufacture of transformers, motors and other electrical instruments. It is an indispensable and important magnetic material in the field of electric power and electronics, and it is also one of the metal functional materials with the largest output. Studies have shown that silicon content has a great influence on the performance of electrical steel. With the increase of silicon content, the hysteresis coefficient of electrical steel decreases, the iron loss decreases, and the magnetic permeability increases. When the mass fraction of silicon reaches 6.5wt% , Electrical steel has the best soft magnetic properties. Its magnetic permeability reaches the maxim...

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Problems solved by technology

However, if the silicon content exceeds 4.5 wt%, DO 3 (Fe 3 Si) and B 2 The appearance of (FeSi) ordered phase will cause a sudden change in the mechanical properties of electrical steel, especially the sharp drop in ductility. When the silicon content exceeds 5wt%, the electrical steel becomes brittle and hard, and the alloy elongation rate is close to zero. , which makes the alloy difficult to undergo conventional rolling processes

DO in 6.5wt% Si high silicon electrical steel 3 (Fe 3 Si) and B 2 The existence of (FeSi) ordered phase leads to its brittle and hard texture, extremely poor processability, and it is difficult to prepare by conventional rolling process, thus restricting its production and application.

However, only filamentous samples can be obtained by this method, and strip samples cannot be obtained

[0008] The performance of the fast-condensing strip is significantly affected by process factors such as the material of the cooling roll, the rotating speed, the temperature of the molten steel, the width of the nozzle, and the distance from the cooling roll, and the steel strip is prone to cracks and small pit-like defects when the cooling is uneven. Moreover, the thickness, width, and shape of the silicon steel strip produced are all limited, which limits the industrial application of this technology

These studies are limited to applied basic research, and it is still difficult to carry out large-scale production. The reason is that the thickness and width of the high-silicon steel strip produced by the traditional planar flow casting process are limited, and the strip forming rate is very low.

At present, for the rapid solidification technology, the high-silicon steel thin strip produced by the single-roll stripping method is narrow in width and poor in shape. It is still in the experimental stage, the efficiency is low, and there is still a gap from industrialization.

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