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Process for preparing high frequency low loss MnZn ferrite material

A ferrite material, low loss technology, applied in the field of materials

Inactive Publication Date: 2007-07-25
UNIV OF ELECTRONICS SCI & TECH OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, most domestic enterprises produce power ferrite materials equivalent to PW1~PW3, and only a few enterprises can mass produce PW4 power ferrite materials (such as PC50), while PW5MnZn power ferrite materials working at 1~3MHz There have been reports abroad (such as the 3F4 material of Ferroxcube company in the Netherlands), but no similar reports have been seen in China

Method used

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  • Process for preparing high frequency low loss MnZn ferrite material

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Embodiment 1

[0035] 1) Using 53.5mol% Fe 2 o 3 , 6.5mol% ZnO, 40mol% MnCO 3 ; Mill the above powder in a ball mill for 4 hours to make the powder evenly mixed;

[0036] 2) Pre-burning: Pre-burning the ball abrasive obtained in step 1) in a furnace at 950°C for 1.5 hours;

[0037] 3) Doping: Add the following additives to the powder obtained in step 2) by mass ratio: 0.3wt% CaO, 0.4wt% TiO 2 , 0.1wt% SnO 2 , 0.025wt% Nb 2 o 5 , 0.05wt% K 2 CO 3 ; The material powder is ball milled in a planetary ball mill for 16 hours, and the ball milling medium is a superhard zirconium ball;

[0038] 4) molding: adding 10wt% organic binder to the powder obtained in step 3) according to the mass ratio, mixing evenly, and after granulating, the granular powder is pressed into a blank on a press;

[0039] 5) Atmosphere sintering: the blank obtained in step 4) is sintered at 1240° C. for 3 hours in an atmosphere sintering furnace with an oxygen partial pressure of 4% in an equilibrium atmosphere.

...

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Abstract

The method includes following steps: (1) ball milling 51-55mol% Fe2O3,5-10mol%ZnO,35-44mol% MnCO3 to mixing them uniformly; (2) preburning power materials obtaining from (1) under 1000 deg.C; (3) adding additives according to following mass ratios to the power materials obtaining from (2): 0.01-0.4wt% CaO, 0.01-0.5wt% TiO2, 0.01-0.3wt% SnO2, 0.01-0.2wt% Nb2O5, 0.01-0.2wt% K2CO3, ball milling powder materials again to let grain size of powder materials after ball milling reach to sub micro level; (4) molding step; (5) sintering. Since increased quantity of doping additives is adopted, the invention increases resistivity of crystal boundary of material, lowers eddy current loss under high frequency so as to reach purpose of reducing high frequency loss.

Description

technical field [0001] The invention belongs to material technology, in particular to the preparation technology of high-frequency low-loss MnZn ferrite material. Background technique [0002] With the rapid development of the electronic information industry, the application range of MnZn ferrite is increasing day by day. Since MnZn ferrite has a high saturation magnetic flux density (B s ), high permeability (μ), high resistivity (ρ), low loss (P L ) and other characteristics, so it is widely used in various electronic components, such as power transformers, choke coils, pulse broadband transformers, magnetic deflection devices and sensors, etc. Ferrite cores made of MnZn ferrite with high saturation magnetic flux density, high resistivity and low loss have become indispensable basic components for computers, communications, color TVs, video recorders, office automation and other electronic equipment. [0003] Generally, according to different application occasions, MnZn...

Claims

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Application Information

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IPC IPC(8): H01F1/10C04B35/26C04B35/622
Inventor 余忠兰中文孙科陈盛明
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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