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Preparation method of a low-loss heat-free aging iron powder core

An iron powder core, thermal aging technology, applied in the direction of inorganic material magnetism, etc., can solve the problems of rising, iron powder core thermal aging, magnetic core loss, shortened device life, etc., to achieve no thermal aging, low iron powder core loss, insulation, etc. good effect

Active Publication Date: 2016-04-20
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, it does not give how to solve the problem that the thermal aging of the iron powder core and the increase in core loss lead to a significant shortening of the device life

Method used

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  • Preparation method of a low-loss heat-free aging iron powder core

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Experimental program
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Effect test

Embodiment 1

[0027] (1) Select reduced iron powder (commercially available) with a purity of more than 99.0% as the raw material iron powder; the particle size distribution of the raw material iron powder is 200-300 mesh iron powder accounts for 1-10% of the weight, and the iron powder is greater than 300 mesh and less than or equal to 400 mesh It accounts for 5-40%, and the rest is more than 400 mesh iron powder.

[0028] (2) Preparation of mixed aqueous solution of phosphoric acid and chromic acid: dilute phosphoric acid (analytical pure) with water to form a phosphoric acid aqueous solution with a mass concentration of 5%, dilute chromic acid (analytical pure) with water to form a chromic acid aqueous solution with a mass concentration of 2%, and then Phosphoric acid aqueous solution mixed with chromic acid aqueous solution;

[0029] Stir and react the raw iron powder in the mixed aqueous solution of phosphoric acid and chromic acid for 4 hours, then heat up to 120°C and fry the raw iro...

Embodiment 2

[0036] The difference between this embodiment and embodiment 1 is that the inorganic insulating agent is 2% silicon dioxide + 1% kaolin. The test results are shown in Table 1. It can be seen from Table 1 that the power loss of 100kHz and 100mT is at 1710mw / cm 3 , baked at 200°C, the loss is 1703mw / cm after 10,000 hours 3 , The loss is 40.5% of the comparative example, and there is no heat aging phenomenon.

Embodiment 3

[0038] The difference between this embodiment and Embodiment 1 is that the inorganic insulating agent is 2.5% kaolin. The test results are shown in Table 1. It can be seen from Table 1 that the power loss is 1954mw / cm at 100kHz and 100mT 3 , the loss after baking at 200℃ for 10000 hours is 1965mw / cm 3 , The loss is 46.7% of the comparative example, and there is no obvious thermal aging phenomenon.

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Abstract

The invention discloses a method for preparing a low-loss heat-free aging iron powder core. By adding a high-temperature-resistant inorganic insulating agent and a high-temperature-resistant binder, in conjunction with a suitable insulating coating method, and through compression molding and high-temperature annealing processes, the The iron powder core magnetic core maintains the original magnetic properties at 200°C and 10,000 hours, and has no thermal aging phenomenon, which solves the thermal aging problem of ordinary iron powder cores. At the same time, the core loss is about 50% of ordinary iron powder cores. In the case of 100kHz and 100mT, the core loss is around 2000mw / cm3.

Description

Technical field [0001] The present invention involves a preparation method of a soft magnetic material for iron powder core, which specializes in a preparation method of low loss and non -heat -aging iron powder core. Background technique [0002] The soft magnet powder core material has the characteristics of high saturated magnetic flux density, excellent DC superposition performance, low price and other characteristics. It is widely used in electronic devices such as switching power supply, output inductors, online noise filters, PFC inductors, choice circles, UPS power supply and other electronic devicesEssenceThe preparation method of traditional iron powder core materials is to cover the insulation of insulation materials such as phosphate, and then add epoxy resin and other adhesives. After the powder is prepared, the powder is suppressed for molding.In this way, the iron powder core products produced are high, and there is a serious problem of heat aging at the same time....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/26B22F1/00B22F1/02C21D1/26
Inventor 金天明过江群童轶龙
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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