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Ultralow-high-frequency-loss-power MnZn ferrite and preparation method thereof

A high-frequency loss and ferrite technology, which is applied in the advanced preparation and application of high-performance ferrite soft magnetic materials, to achieve the effects of promoting uniformity, improving sintering kinetics, and reducing high-frequency resonance bandwidth

Inactive Publication Date: 2014-06-25
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the semiconductivity of MnZn ferrite can also make the material produce strong eddy current loss at high frequencies

Method used

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  • Ultralow-high-frequency-loss-power MnZn ferrite and preparation method thereof
  • Ultralow-high-frequency-loss-power MnZn ferrite and preparation method thereof
  • Ultralow-high-frequency-loss-power MnZn ferrite and preparation method thereof

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Effect test

Embodiment 1

[0024] Utilize the method provided by the present invention to prepare high-frequency ultra-low loss MnZn power ferrite ring core, the preparation steps are as follows:

[0025] A. With high purity Fe 2 o 3 , MnCO 3 and ZnO as raw materials, according to The metering of the component raw materials was carried out with x=0.76, y=0.14, δ=0.10. First to Fe 2 o 3 , MnCO 3 Raw materials such as ZnO and ZnO are firstly ground separately until the average particle size reaches 0.8 μm, and then a uniformly mixed powder is obtained after 2.5 hours of ball milling. Furthermore, the mixed powder was pressed into a block (10x10x10mm) at 50MPa, and pre-fired in a nitrogen furnace. The pre-fired temperature was 850°C, and the synthesis time was 3.5 hours. The pre-fired product was determined to be a single-phase spinel structure MnZn by XRD. Ferrite;

[0026] B. Grind the pre-calcined material in an ethanol medium and perform secondary wet ball milling, and sort the secondary ball ...

Embodiment 2

[0037] Utilize the method provided by the present invention to prepare high-frequency ultra-low loss MnZn power ferrite ring core, the preparation steps are as follows:

[0038] A. Fe 2 o 3 , MnCO 3 and ZnO as raw materials, according to Dosing of the component raw materials is carried out, where x=0.72, y=0.22, δ=0.06. First to Fe 2 o 3 , MnCO 3 Raw materials such as ZnO and ZnO are firstly ground separately until the average particle size reaches 1.0 μm, and then a uniformly mixed powder is obtained through a ball milling process for 3.5 hours. Furthermore, the mixed powder was pressed into a block (10x10x10mm) at 80MPa, and pre-fired in a nitrogen furnace. The pre-fired temperature was 900°C, and the pre-fired time was 2.5 hours. The calcined product was determined to be a single-phase spinel structure by XRD MnZn ferrite;

[0039] B. Grinding and secondary ball milling the pre-fired synthetic materials, and sorting the secondary ball milling powder particles throu...

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Abstract

The invention relates to an ultralow-high-frequency-loss-power MnZn ferrite and a preparation method thereof. The ultralow-high-frequency-loss-power MnZn ferrite is composed of a spinel-structure main crystal phase and a doping component in the grain boundary and crystal, wherein the chemical composition of the spinel-structure main crystal phase is [MnxZnyFe<2>]Fe2<3>O4. The microstructure is characterized in that the relative density of the sintered body is 99.2-99.6%, the average size of the crystal grains is 2.0 mu m@30mT / 1MHz / 100 DEG C and 145<=P[cv]<=160mW / cm<3>@10mT / 3MHz / 100 DEG C.

Description

Technical field: [0001] The invention belongs to the field of advanced preparation and application of high-performance ferrite soft magnetic materials, and relates to an ultra-low high-frequency loss MnZn power ferrite material with a cut-off frequency up to 4.8 MHz and a preparation method thereof. The ultra-low high-frequency loss power MnZn ferrite material is especially suitable for high-frequency high-power-density modular switching power supplies using zero-current / zero-voltage soft switching technology, and has important application value for the miniaturization and high-density integration of microelectronic devices . Background technique: [0002] MnZn ferrite is a kind of soft magnetic material widely used in modern communication, computer, radio and television, automotive electronics and national defense technology and other fields. In recent years, as microelectronics technology continues to put forward miniaturization and integration requirements for magnetic f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/34C04B35/26C04B35/622
Inventor 曾燕伟殷文慧丁川
Owner NANJING TECH UNIV
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