A kind of high-frequency large magnetic field soft ferrite material and preparation method thereof

Abstract

The invention belongs to the technical field of soft ferrite materials, and discloses a preparation method of a high-frequency large magnetic field soft ferrite material, which comprises the following steps: (1) ferric oxide Fe as a raw material 2 O 3 , manganese tetroxide 3 O 4 , Zinc oxide ZnO are accurately weighed in proportion to prepare powder with uniform particle distribution; (2) sinter the powder in air to obtain manganese-zinc ferrite pre-sintered powder; (3) mix the pre-sintered powder with The auxiliary components weighed in proportion are mixed; (4) after adding the mixed pellets into the lubricant, the pellets are pressed into green bodies; (5) the green bodies are placed in a controlled nitrogen atmosphere furnace, and specific sintering is adopted. The curve is sintered. The high-frequency large magnetic field soft ferrite material prepared by the invention not only takes into account the low loss characteristics in the wide frequency range of 1 MHz to 4 MHz, but also has high saturation magnetic flux density.

Description

technical field [0001] The invention belongs to the technical field of soft ferrite materials, in particular to a preparation method of a high-frequency large magnetic field soft ferrite material. Background technique [0002] High-frequency large magnetic field soft ferrite material, mainly developed for high-frequency, lightweight and other circuit modules, can be suitable for promotion and application 1. People's livelihood equipment: high efficiency, small adapters, switching power supplies, etc.; 2. Industrial equipment : DC-DC converters, high-output small switching power supplies, inverters, etc.; 3. Vehicle products (EV, HEV): vehicle chargers, DC-DC converters, etc. With the development of power supply technology and communication technology, the development of power supply in the direction of more energy saving and miniaturization requires higher power loss of materials. [0003] Ferrite cores are basic materials and components in the electronics industry, and are...

AI Technical Summary

Problems solved by technology

[0005] In the industry, in order to reduce high frequency and low loss, scientific and technical personnel have done a lot of research, including main formula, auxiliary components and process methods, etc. For example, the publication number CN200910133729.5 discloses a high frequency and low loss ferrite material. by iron oxide Fe 2 o 3 The amount is limited in the range of 53 ~ 56mol%, manganese carbonate MnCO 3 The amount of ZnO is limited in the range of 34-41mol%, and the amount of zinc oxide ZnO is limited in the range of 6-10mol%, which realizes high-frequency low-loss materials, but the materials shown in this document only realize loss at 500kHz, 50mT, and 100°C 3 , and the lowest loss > 59mW / cm 3

Another example is the publication number CN200710156544.7, which discloses a method for mass production of high-frequency and low-loss MnZn power ferrites, and uses this method to achieve a power loss of 80mW / cm under the conditions of 500kHz, 50mT, and 100°C 3 , and the power loss is 800mW / cm at 1MHz, 30mT, 100℃ 3 , Power loss 260mW / cm at 3MHz, 10mT, 100℃ 3 , it can be seen that there is no high-frequency material applied under the condition of 1MHz ~ 4MHz, or the loss is relatively high