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Nanocrystalline composite magnetic core and preparation method thereof

A nanocrystalline composite and magnetic core technology, which is applied in the manufacture of inductors/transformers/magnets, the magnetism of inorganic materials, and electrical components, can solve problems such as low transient impedance, easy damage to switching devices, and low magnetic permeability. Solve the transient current distortion, improve the power factor of the power supply, and improve the effect of the initial magnetic permeability

Inactive Publication Date: 2017-03-22
JIANGXI AITE MAGNETS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are mainly two types of problems in the application process of switching power supplies: 1. The efficiency cannot be balanced under different loads: the electrical equipment will not run at full load with rated power for 24 hours, and it will be in standby state for part of the time, while the active PFC design The main design will be made for more than 50% load, resulting in low efficiency of the power supply at light load
2. The active PFC in the intermittent working mode or the alternating large current on the inductive load will cause the switching device to be easily damaged, the switching loss will increase, the reactive power consumption will increase, and the efficiency of the whole machine will be reduced.
The magnetic core in the prior art is made of various soft magnetic alloy powders, so it has countless small air gaps evenly distributed, which determines that it has a strong anti-saturation ability, that is, it can not be saturated under high current. However, due to the distributed air gap, the magnetic permeability is low, generally not more than 200, and the transient impedance is low

Method used

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  • Nanocrystalline composite magnetic core and preparation method thereof

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preparation example Construction

[0028] The present invention also provides a method for preparing the nanocrystalline composite magnetic core described in the above technical solution, comprising the following steps:

[0029] (1) mixing the magnetic nanocrystalline alloy powder with an insulating coating agent to obtain a mixed material;

[0030] (2) Molding the mixed material obtained in the step (1) with the ferrite magnetic core, so that the mixed material is coated on the surface of the ferrite magnetic core to obtain a green body;

[0031] (3) Preheating the green body obtained in the step (2) to obtain a nanocrystalline composite magnetic core precursor;

[0032] (4) Annealing the nanocrystalline composite magnetic core precursor obtained in the step (3) to obtain a nanocrystalline composite magnetic core.

[0033] The invention mixes the magnetic nano crystal alloy powder and the insulating coating agent to obtain the mixed material. In the present invention, the mixing temperature is preferably 15-...

Embodiment 1

[0044] Mix 150-mesh 1K107 magnetic nanocrystalline alloy powder with a weight of 27.9 g, 0.8 g of phosphoric acid, 1 g of sodium silicate and 0.3 g of kaolin at room temperature for 5 min at a rate of 5 to 60 r / min to obtain a mixed material;

[0045] Put 20g of the mixed material into a mold of OD33.02mm×ID19.9mm×HT15mm, then put 3g of nickel-zinc ferrite powder core with the size of OD30mm×ID25mm×HT3mm into the mold, and finally put the remaining 10g of the mixed material into the mold, the pressure reaches 21t / cm 2 Hold for 10s at the same time, and the green body is obtained by ejecting the mold;

[0046] Preheating the green body at 200°C for 50 minutes under a vacuum of 0.08 Pa to obtain a nanocrystalline composite magnetic core precursor;

[0047] Under the same vacuum condition, keep the temperature at 400° C. for 60 minutes, and cool with the furnace to obtain the nanocrystalline composite magnetic core.

Embodiment 2

[0049] Mix 250-mesh 1K107 magnetic nanocrystalline alloy powder with a weight of 29.5g, 0.3g tetraethyl orthosilicate and 0.2g zinc stearate at a rate of 5-60r / min at 80°C for 10min to obtain a mixed material;

[0050] Put 20g of the mixed material into a mold of OD33.02mm×ID19.9mm×HT15mm, then put 3g of MnZn ferrite core with the size of OD30mm×ID25mm×HT3mm into the mold, and finally put the remaining 10g of mixed material into the mold, pressurized 18t / cm 2 Hold for 15s, withdraw from the mold, and obtain the green body;

[0051] In the nitrogen condition with a flow rate of 5L / min, preheat treatment at 250°C for 30min to obtain the nanocrystalline composite magnetic core precursor;

[0052] In the same atmosphere, annealing was performed at 400°C for 80 minutes to obtain a nanocrystalline composite magnetic core.

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Abstract

The invention provides a nanocrystalline composite magnetic core and a preparation method thereof. The nanocrystalline composite magnetic core provided by the invention is obtained by sequential pressing and heat treatment on the following raw materials in percentage by mass: 80%-99% of magnetic nanocrystalline alloy powder, 0.5%-8% of an insulating coating agent and the balance of ferrite magnetic core; and the magnetic nanocrystalline alloy powder coated with the insulating coating agent on the surface coats the surface of the ferrite magnetic core, so that current distortion is reduced by using over-high current unsaturated capacity of the magnetic nanocrystalline alloy powder and combining high permeability of the ferrite magnetic core, the problem of transient current distortion of low-impedance high switching current is solved, the transient loss of high current is reduced, the nanocrystalline composite magnetic core plays a soft landing role in instant on-off of the high current, electric equipment is protected and the power factor of a power supply is improved. An experiment result shows that the initial permeability is improved by the nanocrystalline composite magnetic core provided by the invention, and the permeability of the nanocrystalline composite magnetic core reaches 10,000 and is the initial permeability of the ferrite magnetic core basically when the magnetic field intensity is 0.2(Oe).

Description

technical field [0001] The invention relates to the technical field of electronic components, in particular to a nanocrystalline composite magnetic core and a preparation method thereof. Background technique [0002] The 21st century is an era of informationization. The rapid development of informationization makes people more and more dependent on electronic equipment and products, and these electronic equipment and products are inseparable from power sources. Compared with linear power supplies, switching power supplies have advantages in terms of efficiency, volume and weight, especially high-frequency switching power supplies are becoming lighter, smaller, more efficient and more reliable, which makes high-frequency switching power supplies the most widely used Power supply, its application fields range from household lighting, air conditioners, TVs, computer power supplies, etc. to office printing copiers and so on. With the increasing shortage of energy at home and ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/33H01F1/24H01F41/02
Inventor 毛圣华张勉团皮金斌
Owner JIANGXI AITE MAGNETS
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