Formula and process of Li-Ti-Zn soft magnetic ferrite material with high frequency and high resistivity

Abstract

The invention discloses a formula and process of a Li-Ti-Zn soft magnetic ferrite material with high frequency and high resistivity, relating to the physical technical field of soft magnetic ferrites. According to the formula, the Li-Ti-Zn soft magnetic ferrite material comprises 50-65mol% of Fe2O3, 1-4mol% of MnO, 10-20mol% of ZnO, 1-4mol% of TiO2, 0.1-0.5mol% of Co2O3, 15-28mol% of Li2CO3 and 0.2-0.8mol% of Bi2O3. The design originality of the formula is as follows: NiO in a nickel-zinc ferrite is replaced with LiCO3 on the premise that the performance of a product is unchanged, so that the production cost is greatly reduced, and the favorable economic benefit and social value are achieved.

Description

Technical field: [0001] The invention relates to the technical field of soft ferrite physics, in particular to a high-frequency high-resistivity Li-Ti-Zn soft ferrite material formula and process. Background technique: [0002] High-performance soft ferrite technology is a relatively mature technology. MnZn ferrite materials are usually used as inductance below 1MHZ, transformers, and oscillating coil cores, accounting for 20% of the soft ferrite market, and it is also a soft magnet with a relatively low price. Oxygen materials, but the MnZn ferrite technology has the following defects: the high frequency of use is limited to below 1MHZ, and the resistivity is low, the Curie temperature is less than 300 ℃, the equipment investment is high, and the process is difficult; while NiZn soft ferrite, the resistance The rate can reach 10 6 , low high-frequency loss, high Curie temperature (less than 500°C), simpler production equipment than MnZn, sintered in air, magnetic permeabil...

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Problems solved by technology

[0002] High-performance soft ferrite technology is a relatively mature technology. MnZn ferrite materials are usually used as inductance below 1MHZ, transformers, and oscillating coil cores, accounting for 20% of the soft ferrite market, and it is also a soft magnet with a relatively low price. Oxygen materials, but the MnZn ferrite technology has the following defects: the high frequency of use is limited to below 1MHZ, and the resistivity is low, the Curie temperature is less than 300 ℃, the equipment investment is high, and the process is difficult; while NiZn soft ferrite, the resistance The rate can reach 10 6 , low high-frequency loss, high Curie temperature (less than 500°C), simpler production equipment than MnZn, sintered in air, magnetic permeability 8-3000, especially widely used, second only to MnZn materials, but NiZn ferrite It is a porous material, easy to be affected by moisture, and uses noble metal oxide material NiO, which has high manufacturing cost; MnZn ferrite material can partially replace NiZn ferrite, and is used in the 10-100MHz frequency band. The process is basically the same as NiZn. So far, Ferrite materials are limited to the application of deflection cores, and EMI / RFI cores. They are cheap, have poor filtering performance, and their electromagnetic properties are not as good as NiZn; LiZn soft ferrite has high Curie temperature, high resistivity, and low sintering temperature. The equipment is relatively simple, energy-saving, and can replace expensive NiZn ferrite materials in many fields, but under high temperature conditions, Li is easy to volatilize, and the production process is complex and difficult