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Preparation method of low-loss nano crystal soft magnetic alloy

A nanocrystalline soft magnetic, low loss technology, applied in the direction of inductance/transformer/magnet manufacturing, magnetic objects, manufacturing tools, etc., can solve the problem that heat treatment conditions are not easy to control and operate, it is difficult to achieve comprehensive soft magnetic properties, high saturation magnetic Insensitivity and other issues to achieve the effect of broadening the product market and application prospects, increasing the nucleation rate and reducing the heating rate

Active Publication Date: 2019-01-18
NINGBO INNOVATION CENT FOR APPLIED MAGNETICS CO LTD +2
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the coercive force in this patent is relatively high, and the heating rate during the heat treatment is 50°C / s, the heating rate is high, the combined duration of heating and holding is low, and the heat treatment conditions are not easy to control and operate
[0009] The above-mentioned patents have improved the soft magnetic properties of nanocrystalline alloy materials to varying degrees by optimizing the heat treatment process, but there are still two significant disadvantages: (1) The heat treatment process is demanding on the process, which greatly limits its application in the industry. (2) In terms of soft magnetic properties, it is difficult to achieve excellent and stable comprehensive soft magnetic properties, that is, to achieve high saturation magnetic induction and low high-frequency loss at the same time

Method used

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  • Preparation method of low-loss nano crystal soft magnetic alloy
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Examples

Experimental program
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Effect test

Embodiment 1

[0048] In this example, Fe 76 Si 13 B 8 Nb 2 Cu 1 The preparation method of nanocrystalline soft magnetic alloy comprises the following steps:

[0049] (1) Dosing according to the alloy composition. After the master alloy is smelted, the quenched alloy strip is obtained by single-roll quenching technology, and the copper roll speed is 30m / s.

[0050] Adopt D8Advance type polycrystalline X-ray diffractometer (XRD) to detect the microstructure of this quenched strip material, the result is as follows figure 2 as shown, figure 2 It shows that the as-quenched strip has a broadened diffuse diffraction peak, indicating that the alloy as-quenched strip has an amorphous structure.

[0051] (2) Using NETZSCH DSC404C differential scanning calorimeter (DSC) to measure the crystallization temperature of the alloy strip at a heating rate of 0.67 °C / s, the results are as follows image 3 shown. As can be seen from the figure, the initial crystallization temperature of the first cr...

Embodiment 2

[0064] In this example, Fe 75.5 Si 13 B 8 Nb 2 Cu 1 (MoCTi) 0.5 The preparation method of nanocrystalline soft magnetic alloy comprises the following steps:

[0065] (1) Dosing according to the alloy composition. After the master alloy is smelted, the quenched alloy strip is obtained by single-roll quenching technology, and the copper roll speed is 30m / s.

[0066] Adopt D8Advance type polycrystalline X-ray diffractometer (XRD) to detect the microstructure of this quenched strip material, the result is as follows figure 2 as shown, figure 2 It shows that the as-quenched strip has a broadened diffuse diffraction peak, indicating that the alloy as-quenched strip has an amorphous structure.

[0067] (2) Using NETZSCH DSC404C differential scanning calorimeter (DSC) to measure the crystallization temperature of the alloy strip at a heating rate of 0.67 °C / s, the results are as follows image 3 shown. As can be seen from the figure, the initial crystallization temperature ...

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Abstract

The invention provides a preparation method of low-loss nano crystal soft magnetic alloy. In the method of the invention, when crystallization heat treatment is performed on a strip obtained in a quenching technology, a heat treatment process is divided into four steps: step I, applying a magnetic field for thermal insulation in a copper cluster precipitation temperature zone along a length direction of an alloy strip; step II, performing thermal insulation in an optimum potential heat release temperature zone under a magnetic-field-free condition; step III, applying the magnetic field for thermal insulation in an optimum crystallization and growth temperature zone of alpha-Fe-phase nano crystal grains; and finally, applying the magnetic field for thermal insulation at a temperature less than the copper cluster precipitation temperature along a width direction of the strip. Compared with an existing heat treatment method, the method can reduce the high-frequency loss of the nano crystal soft magnetic alloy and can improve the comprehensive performance of the nano crystal soft magnetic alloy.

Description

technical field [0001] The invention belongs to the technical field of nanocrystalline soft magnetic alloy materials, in particular to a method for preparing low-loss nanocrystalline alloys. Background technique [0002] With the emergence of the energy crisis and the development of science and technology, the world is paying attention to energy saving and low-carbon environmental protection. Therefore, electronic devices are developing in the direction of miniaturization, high efficiency, high frequency and low energy consumption, which requires soft magnetic alloy materials It has the properties of high saturation magnetic induction, low high frequency loss, high magnetic permeability and good frequency characteristics. [0003] Compared with traditional soft magnetic materials, nanocrystalline soft magnetic alloy is a new type of soft magnetic alloy material with nanoscale α-Fe phase that is uniformly precipitated and dispersed on the amorphous matrix through crystallizat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/12C22C38/16C22C38/32C22C38/14C22C38/06C21D9/52C21D1/04H01F1/147H01F41/02
CPCC21D1/04C21D9/52C22C38/002C22C38/02C22C38/06C22C38/12C22C38/14C22C38/16C22C38/32H01F1/14775H01F41/02
Inventor 贺爱娜董亚强黎嘉威肖恢芸李润伟
Owner NINGBO INNOVATION CENT FOR APPLIED MAGNETICS CO LTD
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