Preparation method of amorphous nanocrystalline alloy with high magnetic permeability

Abstract

The invention discloses a preparation method of an amorphous nanocrystalline alloy with high magnetic permeability. The preparation method comprises the following steps that the weighting is carried out according to the content of the various elements in the amorphous nanocrystalline alloy component expression, the amorphous nanocrystalline alloy component expression is FeaCobSicBdCueMfM'g, wherein M is at least one of V, Ta and Nb, M' is at least one of Ti, Zr, Hf, Ni, Ge, Cr, Mn, W, Zn, Sn, Sb, Mo, Y and Al; a, b, c, d, e, f and g represent the atomic percent content of the corresponding element; a, b, c, d, e, f and g satisfy the conditions that a is less than or equal to 82 and greater than or equal to 74, b is less than or equal to 5 and greater than 0.01, c is less than or equal to 15 and greater than or equal to 5, d is less than or equal to 13 and greater than or equal to 4, e is less than or equal to 1.5 and greater than or equal to 0.2, f is less than or equal to 4 and greater than or equal to 1, and g is less than or equal to 1 and greater than or equal to 0 and a + b + c + d + e + f + g is equal to 100. The mother alloy is smelted, the amorphous alloy strip is prepared,and the amorphous alloy strip is subjected to magnetic field heat treatment to obtain the nanocrystalline alloy material. The nanocrystalline alloy material has an effective permeability of 100 kHz or less and has the effective permeability of 35,000kHz or above, and meanwhile, the nanocrystalline alloy material has a saturation magnetic induction intensity advantage of 1.35 T or above.

Description

technical field [0001] The invention relates to a soft magnetic material in the field of magnetic functional materials, especially a soft magnetic material with high magnetic permeability at high frequency (effective magnetic permeability of more than 35000 at a frequency of 100kHz, and a saturation magnetic induction of more than 1.35T at the same time) A method for preparing an amorphous nanocrystalline alloy. Background technique [0002] Amorphous nanocrystalline soft magnetic alloy is a new type of soft magnetic material. Power electronics such as transformers, motors, transformers, filter inductors, inverters, and wireless charging modules are manufactured using amorphous nanocrystalline alloys as core materials. Components, compared with similar components made of traditional soft magnetic materials, have the advantages of smaller volume, higher efficiency, higher precision and higher quality, so they have been widely used in automobiles, frequency conversion applianc...

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Problems solved by technology

However, the Fe content of this series of nanocrystalline alloys is low, and the atomic percentage is only 67%-74.2%. Although the saturation magnetic induction value is not given in the patent specification, according to the positive correlation between the saturation magnetic induction intensity and the Fe content in the field of nanocrystalline alloys Based on technical experience, the saturation magnetic induction of most components in this series of alloys is lower than that of commercial FINEMET alloys (Fe content is about 73.5at%), that is, lower than 1.25T, which is not conducive to the miniaturization of electronic components.

[0009] It can be seen that there is a serious shortage of new soft magnetic materials with higher magnetic permeability and higher saturation magnetic induction at high frequencies, especially in the frequency band above 100kHz, which are required by current power electronic components. The development of high frequency and miniaturization has caused obstacles

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