Wide temperature ultra-low loss MnZn soft magnetic ferrite material and preparing method thereof

A soft ferrite, ultra-low technology, applied in the direction of magnetism of inorganic materials

Inactive Publication Date: 2010-05-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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[0005] At present, there are no similar reports in China

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  • Wide temperature ultra-low loss MnZn soft magnetic ferrite material and preparing method thereof
  • Wide temperature ultra-low loss MnZn soft magnetic ferrite material and preparing method thereof
  • Wide temperature ultra-low loss MnZn soft magnetic ferrite material and preparing method thereof

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Embodiment Construction

[0020] The loss of ferrite mainly includes hysteresis loss, eddy current loss and residual loss. When the frequency is lower than 500kHz, hysteresis loss and eddy current loss dominate the total loss, and the remaining loss is negligible. In a wide temperature range, hysteresis loss dominates at low temperature, while eddy current loss dominates at high temperature. Therefore, reducing the hysteresis loss at low temperature and the eddy current loss at high temperature as much as possible is the key to the preparation of wide temperature ultra-low loss ferrite materials. The hysteresis loss is mainly related to the initial permeability of the material, the greater the initial permeability, the lower the hysteresis loss. For MnZn ferrite, the most effective way to increase the initial permeability is to reduce the magnetocrystalline anisotropy constant. Fe 2+ and Co 2+ Has a positive magnetocrystalline anisotropy constant, so an appropriate amount of Fe 2+ and Co 2+ It ca...

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Abstract

The present invention relates to wide-temperature ultra-low-loss MnZn soft magnetic ferrite material and method for manufacturing, and belongs to electronic material technology field. The main constituent is calculated by oxide with molar percentage: 65-75mol%Fe2O3, 13-20mol%ZnO, 0.0001-0.5mol%TiO2, allowance being Mn3O4; weight percentage ofdoping agent: 0.01-0.1wt%CaO, 0.01-0.09wt%Nb2O5, 0.01-0.1wt%V2O5, 0.001-0.1wt%ZrO2, and 0.05-1wt%Co2O3. Grain of wide-temperature ultra-low-loss MnZn soft magnetic ferrite material of the invention is uniform and dense, and average grain dimension is about 12-18Mum.

Description

Technical field: [0001] The invention belongs to the technical field of electronic materials. Background technique [0002] MnZn ferrite material is currently the largest and most widely used soft ferrite material. And with the rapid development of the electronic information industry, MnZn ferrite is widely used in various electronic components, such as power transformers, choke coils, pulse broadband transformers, magnetic deflection devices and sensors. Generally, according to different application occasions, MnZn ferrite can be roughly divided into two categories: high-conductivity ferrite mainly used for signal transmission and conversion, and power ferrite mainly used for power transmission and conversion. [0003] MnZn power ferrite is mainly used in various switching power supply transformers and power inductance devices, so MnZn power ferrite materials are required to have: (1) high saturation magnetic induction (B s ) and high permeability (μ) to improve power con...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/34C04B35/26C04B35/64
Inventor 兰中文余忠李乐中姬海宁孙科蒋晓娜
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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