Soft magnetic ferrite material with high magnetic permeability and method for preparing soft magnetic ferrite material

Abstract

The invention discloses a soft magnetic ferrite material with high magnetic permeability. The soft magnetic ferrite material comprises main components and auxiliary components. The main components comprise, by weight, 50.8-53.8 mol% of iron oxide, 25.2-27.2 mol% of manganese oxide and the balance zinc oxide; the auxiliary components comprise at least five of TiO2, CaCO3, Bi2O3, Co2O3, Li2O, ZrO2 and WO3. The soft magnetic ferrite material with the high magnetic permeability has the advantages that the initial magnetic permeability of the soft magnetic ferrite material is higher than 7000 (25 DEG C), variation of the initial magnetic permeability is lower than 13% in the range from -55 DEG C to 85 DEG C, the initial magnetic permeability is higher than 6000 in the range from 10 kHz to 400 kHz, the cutoff frequencies are higher than 5 MHz, the hysteresis constant eta B is lower than 0.2*10<-6> / mT; (in the temperature range of -55 DEG C to 85 DEG C, B1=1.5 mT and B2=3mT), the hysteresisconstant eta B is lower than 0.18*10<-6> / mT at 25 DEG C; ( B1=1.5 mT and B2=3 mT); the soft magnetic ferrite material can be widely applied to communication transformers and network transformers withrequirements on low signal transmission distortion and high high-frequency anti-jamming capacity.

Description

technical field [0001] The invention relates to a soft ferrite material and a preparation method thereof, in particular to a high magnetic permeability soft ferrite material and a preparation method thereof. Background technique [0002] High magnetic permeability MnZn ferrite materials are mainly used in electronic circuit broadband transformers, pulse and coupling transformers in the fields of integrated services digital network (ISDN), local area network (LAN), wide area network (WAN), background lighting, etc., to resist electromagnetic waves filters etc. [0003] With the development of network technology, xDSL communication technology has been widely used, and the outdoor facilities of modern communication equipment, such as repeaters, amplifiers, microwave relay stations, submarine cables, optical cable deionized underwater equipment, etc., not only require high temperature resistance , It is also required to withstand the severe cold, and the communication equipment...

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Problems solved by technology

For example, the patent document CN101183586A of Dong Magnetic Corporation discloses a high magnetic permeability, low THD soft magnetic ferrite material and its preparation method. The magnetic core prepared by using this method has a magnetic permeability of 7000-13000 at room temperature and has η B -6 / mT characteristics, this material has better low THD performance, but it does not reflect the high magnetic permeability characteristics in a wide range; Manganese zinc ferrite with wide temperature and low distortion and its preparation method. The magnetic core prepared by the method has a magnetic permeability of 5000-10000 and a relative loss factor of -6 , hysteresis coefficient η B -6 / mT(-40℃), η B -6 / mT(25℃), η B -6 / mT(85℃), this material focuses on low specific loss and wide temperature low THD characteristics

This material has good low THD performance over a wide temperature range, but it does not exhibit high magnetic permeability characteristics in a wide range, nor does it exhibit a wide frequency range; A manganese zinc ferrite material with wide temperature and high initial magnetic permeability and its preparation method. The material is also widely used in the field of communication. The material has an initial magnetic permeability greater than 5000 between -60°C and 130°C. Although the material has the characteristics of wide temperature and high magnetic permeability, it does not have the characteristics of low THD; for example, the patent document CN101894650A of Tiantong Company discloses a soft ferrite with wide temperature, high magnetic permeability and low distortion, which has magnetic permeability The rate is 6000 and the magnetic permeability is greater than 5000 at -55°C ~ 85°C, and it also has η B -6 / mT(25℃), relative loss factor tanδ / μi-6 , the Curie temperature is greater than 125°C, this material has the characteristics of wide temperature and high magnetic permeability, but its η B bigger

[0006] It can be seen that it is not yet mature in terms of compatibility with wide temperature, high magnetic permeability characteristics and low THD characteristics, let alone improving frequency characteristics and increasing cut-off frequency

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