A kind of preparation method of iron-nickel-molybdenum magnetic powder core with high magnetic permeability

A high permeability, iron-nickel-molybdenum technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problem of not being able to prepare high-permeability iron-nickel-molybdenum magnetic powder cores, and achieve high permeability and high Effect of Density Permeability

Active Publication Date: 2017-05-03
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention is to overcome the deficiency in the prior art that high-permeability iron-nickel-molybdenum magnetic powder cores cannot be prepared, and provides a method for preparing high-permeability iron-nickel-molybdenum magnetic powder cores with a magnetic permeability of 185 and above

Method used

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  • A kind of preparation method of iron-nickel-molybdenum magnetic powder core with high magnetic permeability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take water atomized iron nickel molybdenum powder 200 mesh - 300 mesh is 100g, more than 300 mesh is 900g, after mixing for 5 minutes evenly put the iron nickel molybdenum powder into the temperature controllable stirring pot; first add 10ml of 0.05% chromic acid aqueous solution, then add Add 10ml of 0.05% phosphoric acid aqueous solution, add 80ml of water, and keep stirring for 30 minutes; then raise the temperature of the stirring pot to 150°C, stir and dry; after drying, add 100ml of potassium water glass aqueous solution with a mass fraction of 0.1%, and continue stirring until Dry until the iron-nickel-molybdenum powder is cooled, add 100ml of acetone solution with a mass fraction of 0.1%, stir for 30 minutes, take out the iron-nickel-molybdenum powder until it is dry; add 0.3% aluminum stearate after the iron-nickel-molybdenum powder is dry As lubricating powder, after stirring evenly, use 18 tons / cm 2 The pressure is pressed into a standard magnetic ring with a...

Embodiment 2

[0028] The preparation method of the iron-nickel-molybdenum magnetic powder core is the same as in Example 1, except that the potassium water glass in the formula of Example 1 is changed into water glass, and all the other technological processes are the same, and the product is prepared, and the test conditions are the same as in Example 1. The test results are shown in Table 1.

Embodiment 3

[0030] The preparation method of the iron-nickel-molybdenum magnetic powder core is the same as in Example 1, except that the aluminum stearate in the formula of Example 1 is changed to zinc stearate as a lubricant, and the rest of the process is the same, and the product is prepared, and the test conditions are the same as in Example 1. . The test results are shown in Table 1.

[0031] Table 1

[0032]

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Abstract

The invention discloses a preparation method of a high-permeability FeNiMo magnetic powder core. The preparation method comprises the following specific operation steps: selecting water-atomized FeNiMo powder; carrying out film forming processing; carrying out insulating processing; after carrying out insulating processing on the FeNiMo powder, adding a high-temperature resistance adhesive to stir and taking out the FeNiMo powder until the FeNiMo powder is air-dried; before forming, adding a lubricant and pressing into a magnetic core after uniformly mixing; carrying out annealing thermal processing on the magnetic core in the N2 atmosphere; spraying epoxy resin paint on the magnetic core. The preparation method has the beneficial effects that by adding a right amount of high-temperature resistance insulating material, selecting a suitable insulating coating method and adopting a pressing forming and high-temperature annealing process, high density and high permeability of the FeNiMo magnetic powder core are realized; the permeability of the FeNiMo magnetic powder core can reach over 185; power loss can reach below 1,000mW / cm<3> under the testing condition of 100K / 100mT.

Description

technical field [0001] The invention relates to the technical field related to the preparation of iron-nickel-molybdenum materials, in particular to a method for preparing a high-permeability iron-nickel-molybdenum magnetic powder core. Background technique [0002] Iron-nickel-molybdenum core, also known as permalloy (MPP), has many excellent magnetic properties, such as high impedance, low hysteresis and low eddy current loss; it still maintains the best inductance stability under the condition of high value current bias , and the inductance offset is extremely small even when the magnetic field strength is as high as 2000 Gauss under AC conditions. Iron-nickel-molybdenum cores are mainly used in power inductor applications, especially output filters for switch-mode power supplies (SMPS); other power applications include differential inductors, boost inductors, and flyback transformers; there are also other professional Applications such as Q low-level filters, load coils...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/147H01F1/24B22F1/02
Inventor 过江群金天明
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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