Mn-Zn ferrite with broad temperature, broadband, high curie point and low loss and preparation method thereof

Abstract

The invention discloses a Mn-Zn ferrite with broad temperature, broadband, high curie point and low loss and a preparation method thereof, the composition calculated by content of oxides is as follows: 52-57mol% of Fe2O3, 3-7mol% of ZnO and the balance of MnO; a first auxiliary component comprises 0.01wt%-0.1wt% of CaO and 0.005wt%-0.02wt% of SiO2; a second auxiliary component comprises one or more of V2O5, Nb2O5, Ta2O5, ZrO2, K2O and NiO, and the content is 0-0.2wt% by calculation, and a third auxiliary component comprises 0.04-0.075wt% of SnO2, 0.08-0.15wt% of TiO2 and 0.05-0.5wt% of Co2O3, wherein, the content of TiO2 is twice as much as that of SnO2. Pre-burning under the protection of nitrogen, sintering, the control of cooling atmosphere and the densification process are carried out, thereby leading the Mn-Zn ferrite with broad temperature, broadband and high curie point to not only meet the market demands of magnetic cores of electromagnetic couplers for electrodeless lamps, but also open up a vast world for new applications of a variety of high frequency power ferrite magnetic cores in communication and strong electric fields.

Description

technical field [0001] The invention relates to a manganese-zinc ferrite material with wide temperature and wide frequency, high Curie point and low loss and a preparation method thereof, belonging to the technical field of ferrite magnetic materials. Background technique [0002] In recent years, the world's major ferrite companies have competed to improve the technical performance of manganese-zinc ferrite materials to adapt to the increasingly expanding application fields. Under the demanding requirements of IT industry, power electronics, lighting electronics and other users, a new and complete The concept has gradually dominated the research and development direction of ferrite soft magnetic materials. This means that the material is required to have a higher saturation magnetic flux density Bs, better DC superposition characteristics, and a lower specific loss coefficient tgδ / μ i (including power consumption Pc under high magnetic flux density) and total harmonic dist...

AI Technical Summary

Problems solved by technology

Nickel-zinc material has the characteristics of high frequency and high Curie point, but the ultra-low temperature magnetic permeability is low, so that the coil inductance is insufficient and difficult to start, and the power consumption of the material is large, and the heat of the lamp is too high; although the manganese-zinc material has high magnetic density and low power consumption Advantages, but the Curie point and frequency are difficult to increase, high temperature is easy to stop vibration, and the size of the lamp is large

[0013] Chinese patent application (CN101183582A) discloses a NiMnZn power ferrite material with high saturation flux density and low loss. It obtains saturation flux density Bs 1194A / m, greater than 460mT at 100°C, high frequency power consumption 500kHz50mT less than 150kw / m at 100°C 3 , but there is no mention of wide temperature and broadband characteristics and the height of the Curie point, so its application range is limited and the cost is high

[0015] Another example is the Chinese patent application (CN101004961A) which discloses the preparation method of high-frequency high-power ferrite materials. By effectively changing the doping of grain boundaries and microstructures, the magnetic permeability is about 1000, and the power consumption at 1MHz, 30mT and 100°C is obtained. 250kw / m 3 , Power consumption 350kw / m at 3MHz, 10mT, 100℃ 3 , but there is a lack of low-frequency power consumption data, wide-temperature characteristics and introduction of Curie point, especially avoiding the saturation magnetic flux density Bs value, which seems to be contrary to the high-frequency high-power name.