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Preparation method of low-loss high-superposition sendust material with magnetic conductivity mu equal to 26

A technology of sendust and low loss, which is applied in the field of preparation of low loss and high stacked sendust materials, and can solve the problem of low DC superposition performance

Inactive Publication Date: 2015-04-08
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the material itself, the DC superposition performance of the sendust material is the lowest among all alloy magnetic powder cores, so sendust materials are rarely used in high DC and AC bias fields. With the development of the power supply industry, cheap and very suitable for high frequency and high power sendust materials will be more competitive in the market if they can rely on technological improvements to improve their superposition performance

Method used

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  • Preparation method of low-loss high-superposition sendust material with magnetic conductivity mu equal to 26

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Select 1 kg of 200-mesh sendust powder to a temperature-controllable stirring pot, add 200 ml of 30% phosphoric acid aqueous solution, the amount of phosphoric acid added accounts for 6% of the sendust powder by weight, and after stirring continuously for 1 hour, the temperature of the stirring pot rises to 120 ° C. Roast until dry; after sieving, put the powder into an annealing furnace protected by nitrogen and anneal at high temperature for 2 hours; then add 50g of high-temperature binder water glass (that is, account for 5% of the sendust powder by weight), and continue stirring until dry ; Add 3g of zinc stearate lubricating powder, stir evenly, and mix the powder with 18T / cm 3 Pressure pressed into standard magnetic rings of OD27.0, ID14.8, HT11.0; annealing treatment is carried out under the protection of nitrogen at 720±5°C, the oxygen content is controlled at 20ppm during annealing treatment, and the heat treatment time is 180 minutes; Resin paint spraying.

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Embodiment 2

[0031] The preparation process of the magnetic core is the same as in Example 1, except that the amount of phosphoric acid in the formula is reduced to 4% by weight of sendust powder, and 2% of mica powder is added. In order to achieve the median value of inductance, the secondary annealing temperature after compression molding needs to be increased , the test results are shown in Table 1. It can be seen from Table 1 that the loss value of power loss at 100kHz and 100mT is 602mW / cm3; the superposition performance is 100Oe: 78.5%; 50Oe: 90.2%.

Embodiment 3

[0033] The preparation process of the magnetic core is the same as in Example 1, except that 5% high-temperature binder water glass is changed to 5% SiO in the formula 2 sol, the test results are shown in Table 1. It can be seen from Table 1 that the loss value of power loss at 100kHz and 100mT is 723mW / cm3; the superposition performance is 100Oe: 74.5%; 50Oe: 89.2%.

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Abstract

The invention discloses a preparation method of a low-loss high-superposition sendust material with magnetic conductivity mu equal to 26. The method comprises the steps of performing batching, phosphatization and primary annealing, adding an appropriate high-temperature resistant insulating material, performing compression molding and secondary annealing, and then performing appropriate insulating coating. According to the method, the loss of a magnetic core prepared from the sendust material with the magnetic conductivity mu equal to 26 is 500mW / cm3 at 100K / 100mT; and the superposition property is 100Oe:85% and 50Oe:95%. The method has the benefits that the loss of the sendust material is reduced by 100-300mW / cm3 compared with that of other sendust materials of the same kind; and the superposition property is improved by 10% compared with that of the sendust materials of the same kind, reaches an iron silicon level and is approximate to the level of high-flux iron nickel.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a method for preparing a low-loss high-stacked sendust material with a magnetic permeability μ=26. Background technique [0002] Sendust core is a kind of metal soft magnetic powder core produced by powder made of alloy of 5.4% Al, 9.6% Si and 81% Fe. Because the λs and K1 of the material are close to zero, it has low coercivity, high permeability, high saturation magnetization (Bs=10500Gs) and low AC loss. However, due to the material itself, the DC superposition performance of the sendust material is the lowest among all alloy magnetic powder cores, so sendust materials are rarely used in high DC and AC bias fields. With the development of the power supply industry, if the cheap and very suitable for high-frequency and high-power sendust materials can improve their superposition performance by improving the process, they will definitely be more competitive in the ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/147H01F41/02B22F3/02C21D1/26C22C38/06
Inventor 童轶龙
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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