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Preparation method of high-frequency high-magnetic-permeability low-loss iron nickel molybdenum metal magnetic powder core

A technology with high magnetic permeability and iron-nickel-molybdenum, which is applied in the manufacture of inductors/transformers/magnets, magnetic cores/yokes, and the magnetism of inorganic materials. Low rate loss iron-nickel-molybdenum magnetic powder core, large eddy current loss and other problems, to achieve the effect of simple and easy production process, easy to repeat and control, and low cost

Active Publication Date: 2014-08-20
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the method of the above-mentioned patents, the amount of non-magnetic substances coated with magnetic powder insulation is relatively large, and the high density and high magnetic permeability of the iron-nickel-molybdenum magnetic powder core cannot be realized; on the other hand, each of these methods has the pyrolysis of the insulating agent, and the surface insulation Defects such as material falling off and uneven coating will make the high-frequency magnetic performance of the iron-nickel-molybdenum core poor, and the eddy current loss will be large
Therefore, the above-mentioned methods are difficult to manufacture high-frequency high-permeability low-loss iron-nickel-molybdenum magnetic powder cores

Method used

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  • Preparation method of high-frequency high-magnetic-permeability low-loss iron nickel molybdenum metal magnetic powder core
  • Preparation method of high-frequency high-magnetic-permeability low-loss iron nickel molybdenum metal magnetic powder core
  • Preparation method of high-frequency high-magnetic-permeability low-loss iron nickel molybdenum metal magnetic powder core

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Experimental program
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Effect test

Embodiment 1

[0025] In this embodiment, water-atomized iron-nickel-molybdenum magnetic powder is used, and its component weight ratio is: Fe17wt%, Ni79wt%, Mo2wt%, Cu1wt%, Al, Si2 Under pressure, it is molded into a magnetic core of Φ11.2×Φ5.82×3.96. core at N 2 Under the atmosphere, anneal at 690°C for 1 hour, cool down to 200°C with the furnace, and take out the magnetic core. The surface of the magnetic core is sprayed with epoxy resin paint, the paint thickness is 0.3mm, the drying temperature is 160°C, and the drying time is 15 minutes. After heat treatment at 690°C, the insulating film of the magnetic powder inside the magnetic core is still intact and evenly coated on the surface of the magnetic powder, such as figure 1 shown. The magnetic properties of the iron-nickel-molybdenum core are as follows: magnetic permeability 165 (200KHz, 0.05V), quality factor 25 (200KHz, 0.05V), loss 790mw / cm 3 (100KHz, 100mT, 25°C), loss 763mw / cm 3 (100KHz, 100mT, 100°C), superposition performanc...

Embodiment 2

[0027] In this embodiment, water-atomized iron-nickel-molybdenum magnetic powder is used, and its component weight ratio is: Fe18wt%, Ni77wt%, Mo4wt%, Al, Si2 Under pressure, it is molded into a magnetic core of Φ11.2×Φ5.82×3.96. core at N 2 Under atmosphere, anneal at 610°C for 2 hours, cool down to 200°C with the furnace, and take out the magnetic core. The surface of the magnetic core is sprayed with epoxy resin paint, the paint thickness is 0.3mm, the drying temperature is 120°C, and the drying time is 20 minutes. After heat treatment at 610°C, the insulating film of the magnetic powder inside the magnetic core is still intact and evenly coated on the surface of the magnetic powder, such as figure 2 shown. The magnetic properties of the iron-nickel-molybdenum core are as follows: magnetic permeability 149 (200KHz, 0.05V), quality factor 29 (200KHz, 0.05V), loss 670mw / cm 3(100KHz, 100mT, 25°C), loss 659mw / cm 3 (100KHz, 100mT, 100°C), superposition performance (20Oe, 78...

Embodiment 3

[0029] In this embodiment, gas-atomized iron-nickel-molybdenum magnetic powder is used, and its component weight ratio is: Fe17wt%, Ni78wt%, Mo3wt%, Cu1wt%, Al, Si2 Molded under pressure to make a magnetic core of Φ11.2×Φ5.82×3.96. core at N 2 Under the atmosphere, annealing treatment is carried out at 660°C for 1 hour, then cooled to 200°C with the furnace, and the magnetic core is taken out. The surface of the magnetic core is sprayed with epoxy resin paint, the paint thickness is 0.3mm, the drying temperature is 120°C, and the drying time is 15 minutes. After heat treatment at 660°C, the insulating film of the magnetic powder inside the magnetic core is still intact and evenly coated on the surface of the magnetic powder, such as image 3 shown. The magnetic properties of the iron-nickel-molybdenum core are as follows: magnetic permeability 156 (200KHz, 0.05V), quality factor 26 (200KHz, 0.05V), loss 764mw / cm 3 (100KHz, 100mT, 25°C), loss 756mw / cm 3 (100KHz, 100mT, 100°...

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Abstract

The invention discloses a method for preparing a high-frequency, high-permeability and low-loss iron-nickel-molybdenum metal magnetic powder core. In the traditional method of magnetic powder insulation coating, the amount of non-magnetic substances is relatively large, and the high density and high permeability of the iron-nickel-molybdenum magnetic powder core cannot be realized. The present invention first selects water-atomized iron-nickel-molybdenum magnetic powder or gas-atomized iron-nickel-molybdenum magnetic powder to sieve; secondly, the iron-nickel-molybdenum magnetic powder reacts in chromic acid aqueous solution, and an insulating film is formed on the surface of the magnetic powder, which is dried for 2 hours to make the insulating film Solidify and stabilize on the surface of the magnetic powder; then add zinc stearate as a lubricant to the iron-nickel-molybdenum magnetic powder, and press the mixed magnetic powder into an iron-nickel-molybdenum magnetic powder core and perform annealing heat treatment in an N2 atmosphere; finally, the iron-nickel-molybdenum magnetic core is sprayed with epoxy resin paint . The method can uniformly and firmly form an insulating film with a thickness of hundreds of nanometers on the surface of the iron-nickel-molybdenum magnetic powder, has good insulation coating effect, reduces the use of non-magnetic insulating materials, and achieves the purpose of increasing the density of the magnetic core and increasing the magnetic permeability.

Description

technical field [0001] The invention belongs to the field of metal magnetic materials, and relates to a method for preparing a high-frequency, high-permeability and low-loss iron-nickel-molybdenum metal magnetic powder core. This core is the best material for switching power supply direct current (DC) output filter inductors, most suitable for precision audio tuning circuits, high-Q filters, load coils, radio frequency filters and many other precision instrument applications Such as military products, medical equipment, etc. Background technique [0002] With the development of electronic devices such as various switching power converters, filters, and AC-DC converters towards high frequency, miniaturization, and light weight, the iron-nickel-molybdenum metal powder cores used are required to have high magnetic permeability, low loss and High frequency stability. At present, the comprehensive performance of the domestic iron-nickel-molybdenum metal magnetic powder core is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/14H01F3/08H01F41/02
Inventor 严密张章明何时金包大新
Owner ZHEJIANG UNIV
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