Preparation method of mu90 high-permeability Fe-based amorphous magnetic powder core

A high magnetic permeability and magnetic powder core technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problems that it is difficult to further improve the magnetic permeability of amorphous magnetic powder cores, and achieve excellent DC bias characteristics, high magnetic The effects of conductivity, optimal loss characteristics and bias characteristics

Inactive Publication Date: 2013-07-24
ADVANCED TECHNOLOGY & MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the magnetic permeability of Fe-based amorphous magnetic powder cores currently prepared is mostly μ=60, and it is difficult to further improve the magnetic permeability of amorphous magnetic powder cores, and at the same time obtain better DC bias performance and loss characteristics.

Method used

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  • Preparation method of mu90 high-permeability Fe-based amorphous magnetic powder core
  • Preparation method of mu90 high-permeability Fe-based amorphous magnetic powder core
  • Preparation method of mu90 high-permeability Fe-based amorphous magnetic powder core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The composition is Fe prepared by single-roll rapid quenching method 82 Si 2 B 14 C 2 Fe-based amorphous alloy thin strips, the amorphous alloy thin strips were preheated at 300°C for 1 hour under a nitrogen atmosphere, then combined with mechanical milling and jet milling, and Fe-based amorphous alloys with a certain particle size range were screened. Powder, of which -100 mesh ~ +140 mesh powder accounts for 20%, -140 mesh ~ +200 mesh powder accounts for 80%. The powder is mixed with 10% phosphoric acid alcohol solution, dried at 100°C and mixed with 2% cyanate and 2% SiO 2 Mixing and coating granulation, stirring evenly, adding 0.8% zinc stearate, molding at room temperature, the pressing pressure is 2000MPa, and the holding time is 3s. The molded magnetic powder core was kept at 320°C for 1 hour in air for stress relief annealing, and the surface of the heat-treated magnetic powder core sample was coated with epoxy resin paint. The performance test results of th...

Embodiment 2

[0052] Prepare Fe-based amorphous powder in the same manner as in Example 1, change the particle size ratio to: -100 mesh to +140 mesh powder accounts for 30%, -140 mesh to +200 mesh powder accounts for 70%, and the phosphoric acid alcohol solution The amount of addition is changed to 5%, SiO 2 The addition amount of is changed to 1%, and all the other process conditions are unchanged, the performance of the prepared magnetic powder core is as follows:

[0053] (1) The magnetic permeability μ=97.8 under the condition of 100kHz and 1V;

[0054] (2) The frequency characteristics are shown in Table 3 below:

[0055] table 3

[0056]

[0057] (3) When the magnetic permeability drops to 50%, the DC bias magnetic field is H=102Oe;

[0058] (4) Under the condition of 100kHz and 0.1T, the loss of magnetic powder core P cv =627kW / m 3 ;

Embodiment 3

[0060] Prepare Fe-based amorphous powder in the same manner as in Example 1, change the particle size ratio to: -100 mesh to +140 mesh powder accounts for 10%, -140 mesh to +200 mesh powder accounts for 90%, and the cyanate ester The addition amount of is changed to 3%, and all the other process conditions are unchanged, the performance of the prepared magnetic powder core is as follows:

[0061] (1) The magnetic permeability μ=83.2 under the condition of 100kHz and 1V;

[0062] (2) The frequency characteristics are shown in Table 4 below:

[0063] Table 4

[0064]

[0065] (3) When the magnetic permeability drops to 50%, the DC bias magnetic field is H=110Oe;

[0066] (4) Under the condition of 100kHz and 0.1T, the loss of magnetic powder core P cv =470kW / m 3 .

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Abstract

The invention belongs to the field of Fe-based soft magnetic materials and particularly relates to a preparation method of a mu90 high-permeability Fe-based amorphous magnetic powder core. The preparation method comprises the steps of conducting preheating treatment to Fe-based amorphous ribbon which is prepared by adopting a single-roller rapid quenching method; crushing the amorphous ribbon by adopting a mechanical milling and air-current milling combination method; screening amorphous powder to obtain Fe-based amorphous powder with grain size being less than 100-mesh; conducting passivation and insulation treatment to the screened Fe-based amorphous powder, then mixing the Fe-based amorphous powder with adhesive and conducting coating granulation; molding the granulated coated powder to obtain the Fe-based amorphous magnetic powder core; and conducting stress relief annealing to the molded magnetic powder core. The Fe-based amorphous magnetic powder core which is prepared by adopting the method provided by the invention has high permeability and excellent loss and biasing characteristic.

Description

technical field [0001] The invention belongs to the field of iron-based soft magnetic materials, in particular to a method for preparing a μ90 high-permeability Fe-based amorphous magnetic powder core. Background technique [0002] Fe-based amorphous magnetic powder core is a new type of magnetic core material that has emerged in recent years as power supplies tend to develop towards high frequency, low voltage, and high current. Especially in various PFC power supply circuits, it is required that the inductance can carry high frequency and high current requirements. Therefore, the inductor magnetic core material is required to have a high saturation magnetic inductance Bs so that the work under high current will not cause inductance saturation, and the magnetic core material is also required to have excellent loss characteristics and frequency characteristics to adapt to the high-frequency working state under MHz. [0003] Fe-based amorphous magnetic powder core has excell...

Claims

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Application Information

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IPC IPC(8): H01F1/147H01F1/22C22C45/02B22F1/02
Inventor 卢志超李德仁王湘粤陆曹卫刘天成黄纯波
Owner ADVANCED TECHNOLOGY & MATERIALS CO LTD
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