Preparation method of low-loss amorphous magnetic powder core

A magnetic powder core and low-loss technology, which is applied in the field of preparation of low-loss amorphous magnetic powder cores, can solve problems such as unclear loss, and achieve good DC superposition performance, low loss, and low magnetic loss.

Active Publication Date: 2015-04-29
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The DC superposition performance of the amorphous magnetic powder cores prepared with the above patent properties is concentrated at about 65% under the condition of 100Oe magnetic field strength, and the loss is not clear under the condition of 100K / 100mT

Method used

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  • Preparation method of low-loss amorphous magnetic powder core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The Fe-based amorphous strip prepared by the single-roll quick quenching method is subjected to an embrittlement heat treatment. Preferably, the Fe-based amorphous strip is an Fe-Si-B-C amorphous alloy, wherein the atomic mole percentage is: Si (1.5-3.5 at %), B (12-16 at %), C (1-2 at %), and the rest is Fe; the Fe-based amorphous strip is crushed mechanically and jet-milled to obtain Fe-based amorphous soft magnetic alloy powder ; Take 70 grams of amorphous soft magnetic alloy powder with a particle size of 100-200 mesh, 130 grams of 200-300 mesh, stir and mix; add phosphoric acid, nitric acid and chromic acid with a molar ratio of 1:0.8:0.5 and a mass fraction of 0.15% Mix the aqueous solution, stir continuously during the reaction, and react at 150°C for 1 hour; after the reaction is completed, add 0.3% mica powder and stir evenly, then add the mixed aqueous solution of water glass and potassium water glass and stir evenly, at 150°C Keep warm for 1 hour. Then add 2...

Embodiment 2

[0032] The preparation method of the amorphous magnetic powder core is the same as in Example 1, except that the mass fraction of the three acids in the formula is reduced to 0.1%, and the additions in the mixed acid solution are changed to 0.2% mica powder and 0.1% alumina powder after the reaction is completed. At the same time, in order to increase the median value of the inductance, the annealing temperature after molding is increased to 500±5°C. It can be seen from Table 1 that the power loss of this amorphous magnetic powder core is 482mW / cm 3 ; DC superposition performance is 65%.

Embodiment 3

[0034] The preparation method of the amorphous magnetic powder core is the same as in Example 1, except that the particle size distribution of the amorphous soft magnetic alloy powder in the formula is changed to 85 grams of 100-200 mesh magnetic powder, 115 grams of 200-300 mesh magnetic powder, stirred and mixed; , nitric acid and chromic acid mixed aqueous solution, at 120 ℃ for 0.5 hours. It can be seen from Table 1 that the power loss of this amorphous magnetic powder core is 495mW / cm 3 ; DC superposition performance is 70%.

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Abstract

The invention discloses a preparation method of a low-loss amorphous magnetic powder core, and aims to provide a preparation method of the low-loss amorphous magnetic powder core with low magnetic loss and good direct current bias. The amorphous magnetic powder core with magnetic conductivity between 60-90 and higher strength is prepared by adding a proper high-temperature resistant insulating material, selecting a proper insulating coating method, and using compression moulding and high temperature annealing technologies. The preparation method has the following beneficial effects that the magnetic loss is low, the loss is lower than 500mW / cm<3> under the condition of 100K / 100mT; the direct current bias is good, the direct current bias is between 65-70% under the condition that the magnetic field intensity is 100Oe.

Description

technical field [0001] The invention relates to the related technical field of amorphous magnetic powder core soft magnetic materials, in particular to a method for preparing a low-loss amorphous magnetic powder core. Background technique [0002] With the miniaturization development trend of electronic products, the miniaturization and high current of the power supply require the magnetic core material to have a high saturation magnetic flux density (Bs). The market demand drives the development of high Bs amorphous metal soft magnetic products. In the high-speed quenching preparation technology of amorphous metal magnetic powder, it has moved from the laboratory to practical application, which provides a solid foundation for the industrial production of amorphous metal soft magnetic products. At the same time, the amorphous metal soft magnetic material has the unique advantages of low loss and high DC bias, and has become an ideal material for industrial and civil high-fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/153H01F1/24B22F1/00
Inventor 吕世雅金天明
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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