MnZn power ferrite for MHz-level switching mode power supply and preparation method of MnZn power ferrite

Abstract

The invention relates to a MnZn power ferrite for a MHz-level switching mode power supply and a preparation method of the MnZn power ferrite and relates to the electronic material technology. The ferrite is prepared from a main material and a dopant. The main material comprises in molar percentage of oxide as follows: 52mol%-56mol% of Fe2O3, 5mol%-11mol% of ZnO and 33mol%-43mol% of MnO; the dopantcomprises in molar percentage of oxide as follows: 0.05wt%-0.1wt% of CaCO3, 0.1wt%-0.3wt% of TiO2, 0.1wt%-0.3wt% of Co2O3, 0.01wt%-0.1wt% of SnO2 and 0.01wt%-0.1wt% of V2O5. The loss of the materialat high MHz frequency is effectively reduced, and the power loss is lower in the wideband range of 0.5-3 MHz and in the temperature range of 25-100 DEG C. Meanwhile, the preparation method has the advantages of being low in sintering temperature, energy-saving and environmentally friendly.

Description

technical field [0001] The invention relates to electronic material technology, in particular to MnZn power ferrite material. Background technique [0002] Soft magnetic ferrite is an important basic material for electronic devices. Magnetic cores made of soft magnetic materials are mainly used in the manufacture of electronic transformers, inductors and filters. Among them, the MnZn power ferrite material has high saturation magnetic induction (Bs), high initial permeability (μ i ) and low loss (P L ) and other advantages, are widely used in switching power supply transformers. At present, the switching power supply is developing in the direction of high frequency, miniaturization and high efficiency, and with the gradual increase of the application frequency of the switching power supply, the loss of transformers, inductors, etc. is increasing, especially when the frequency reaches MHz, the loss is even more sharp Increase, heat generation increases, which hinders the d...

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Problems solved by technology

The patent (application publication number CN102311263A) discloses "High-frequency, low-loss, high-Bs ferrite material for LED lighting and switching power supply transformers and its preparation method", its μ i =1800±25%, Bs=510mT(25℃), power consumption at 100℃, 500kHz50mT is less than 80mW / cm 3 ;Curie temperature Tc=260℃, resistivity ρ=6.5Ω˙m, sintering temperature is 1300~1350℃, the loss of this material is high, and the sintering temperature is high

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