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Magnetism, copper and zinc-iron soft magnetic ferrite material and preparation method thereof

A soft ferrite, magnesium-copper-zinc technology, applied in the field of soft ferrite materials and preparation, can solve the problems of characteristic attenuation, high mechanical strength, and large limitations of magnesium-zinc ferrite, and achieve high DC superposition characteristics, The effect of good mechanical strength, excellent high frequency characteristics

Inactive Publication Date: 2012-07-04
南通鼎源电子磁材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One is the applicable frequency. Generally, magnesium-zinc ferrite is only applicable below 20MHz. Above this frequency, its characteristics attenuate significantly, which is difficult to compare with nickel-zinc
Second, the DC superposition characteristics are low
Third, the mechanical strength is not as high as nickel-zinc ferrite
The above defects lead to excessive limitations in the application of magnesium zinc ferrite

Method used

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  • Magnetism, copper and zinc-iron soft magnetic ferrite material and preparation method thereof
  • Magnetism, copper and zinc-iron soft magnetic ferrite material and preparation method thereof
  • Magnetism, copper and zinc-iron soft magnetic ferrite material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] According to iron oxide: zinc oxide: magnesium oxide: copper oxide = 51.2:10:34.8:4 mol%, the main ingredients are mixed, and the additives are added according to the mass fraction, calcium carbonate 0.4, cobalt oxide 0.35 bismuth oxide 0.06. Mix the prepared materials in a vibration ball mill for 1 hour, pre-fire at 1050 ° C, keep warm for 3 hours, and then vibrate ball mill for 1 hour again after cooling. Add water to the sand mill, the slurry concentration is 65%, sand mill for 2 hours, add PVA solution, defoamer, dispersant, and spray granulate to obtain granules. Press T18*10*5, sinter at 1250°C, and hold for 4 hours. Get the finished magnetic core. Φ0.31 enameled wire 20 turns, test the Q value, and compare it with nickel-zinc ferrite with the same magnetic permeability, it can be seen that the two materials have similar frequency characteristics below 50MHz.

[0024] A is magnesium-zinc material B is a commonly used nickel-zinc material, and the magnetic permea...

Embodiment 2

[0028] According to iron oxide: zinc oxide: magnesium oxide: copper oxide = 48.5:21.6:25.9: 4 mol%, the main ingredients are prepared, and the additives are added according to the mass fraction, vanadium pentoxide 0.2, cobalt oxide 0.35, bismuth oxide 0.12. The manufacturing process of granular material is the same as example 1. Press the I-shaped magnetic core 6*8 with the obtained pellets, sinter at 1250°C, and keep warm for 4 hours. Get the finished magnetic core. Φ0.12 enameled wire, 238.5 turns, 10K, 0.3V for inductance measurement. Comparison with the same core made of NiZn material. It can be seen that the DC superposition characteristics of the magnesium-zinc core and the nickel-zinc core are similar in mechanical strength.

[0029] A is magnesium-zinc material B is a commonly used nickel-zinc material, the magnetic permeability of both materials is 350

[0030]

[0031] A high DC superposition characteristic ΔB(Bs-Br) value is critical. The above-mentioned ma...

Embodiment 3

[0036] According to iron oxide: zinc oxide: magnesium oxide: copper oxide = 49.5:22:25:3.5 mol%, the main ingredients are mixed, and the additives are added according to the mass fraction, vanadium pentoxide 0.2, bismuth oxide 0.15,. The manufacturing process of granular material is the same as example 1. Press the rod-shaped magnetic core 4*15 with the obtained pellets, sinter at 1250°C, and keep the temperature for 4 hours. Get the finished magnetic core. Φ0.8 enameled wire, 13.5 turns, 1K, 1V for inductance measurement. Comparison with the same core made of NiZn material. It can be seen that the DC superposition characteristics of the magnesium-zinc core and the nickel-zinc core are similar in mechanical strength.

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Abstract

The invention discloses a magnetism, copper and zinc-iron soft magnetic ferrite material and a preparation method thereof. Formula of main components by mole percentage comprises ferric oxide, zinc oxide, magnesium oxide and copper oxide. First assistant components of doping agents comprise one of or mixture of several of components of calcium carbonate or cobalt oxide or silicon dioxide. Second assistant components of the doping agents comprise one of or mixture of any two or three of components of vanadium pentoxide or bismuth oxide or lithium carbonate. The preparation method includes primary ball-milling, presintering, secondary ball-milling, forming and sintering. Then a blank part is placed in a sintering furnace for sintering, four-hour heat preservation at temperature of 1250 DEG C is carried out, and a finished magnetic core is obtained. Technical performance of the magnetism, copper and zinc-iron soft magnetic ferrite material is the same as that of nickel zinc ferrite, and rod-shaped, I-shaped and annular-shaped magnetic cores manufactured by the preparation method have large cost advantages.

Description

technical field [0001] The invention relates to the technical field of soft magnetic ferrite material and its preparation. Background technique [0002] Ferrite material, also known as oxide magnetic material, is a composite oxide composed of iron and other metals. Soft ferrite materials mainly include MnZn system, NiZn (NiCuZn) system, and MgZn (MgCuZn ) system. [0003] MnZn-based ferrite has high initial permeability, high saturation magnetic induction, and low loss in the radio intermediate frequency or low frequency range. It is the ferrite material with the best magnetic properties in the frequency range below 1 MHz. Commonly used MnZn series ferrite has an initial permeability μ i =400-20000 and a saturation magnetic induction Bs=400-530mT. [0004] NiZn (NiCuZn) series ferrite can be used at a frequency of 100kHz ~ 100MHz, and can be used up to 300MHz. This kind of material has low magnetic permeability and high resistivity, generally 105 ~ 107 Ω cm. Therefore, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 刘雪军万玉保边历峰
Owner 南通鼎源电子磁材有限公司
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