Manganese zinc ferrite material for eddy current type approach switch, film-coated magnetic core and preparing method of manganese zinc ferrite material

Abstract

The invention relates to a manganese zinc ferrite material for an eddy current type approach switch, a film-coated magnetic core and a preparing method of the manganese zinc ferrite material. The principal component of the manganese zinc ferrite material contains: 51.5-53 mol% of Fe2O3, 24.0-25.0 mol% of Mn3O4 and 20.50-22.5 mol% of ZnO; and the accessory component of the manganese zinc ferrite material contains:0.50-1.00 wt% of nanometer TiO2, 0.30-0.50 wt% of nanometer SiO2, 1.00-1.50 wt% of nanometer CaO, 0.05-0.35 wt% of nanometer Co2O3 and 0.05-0.10 wt% of nanometer SnO2. The manganese zinc ferrite material is made in the oxide method, formed in mold pressing mode, sintered and grinded and then subjected to film coating on the outer surface of the magnetic core, a transition layer is made of chrome, and a target layer is made of palladium. Resistivity of the manganese zinc ferrite material in 1 MHz is that rho>=10 ohmm, relative temperature thermal index of the manganese zinc ferrite material in the temperature range of -55 DEG C to 25 DEG C is that alpha muir<=(0.3-1.2)*10-6/ DEG C, and relative temperature thermal index of the manganese zinc ferrite material in the temperature range of 25 DEG C to 100 DEG C is that alpha muir<=(0.4-1.6)*10-6/ DEG C. The magnetic core with the film-coated outer surface has excellent electromagnetic shielding performance, and meets requirements of the eddy current type approach switch for the ferrite material of being high in resistivity, small in specific temperature coefficient and strong in anti-jamming capability.

Description

Technical field [0001] The present invention is the field of soft magnet oxygen technology, which involves a high resistivity (ρ ≥10Ω · m) in 1MHz; within a wider temperature range, it has a small initial magnetic guidance ratio than the temperature coefficient than the temperature coefficient(-Within the temperature range of -55 ~ 25 ℃, α μir = 0.3 × 10 -6 ~ 1.2 × 10 -6 / ℃, within the temperature range of 25 ~ 100 ℃, α μir = 0.4 × 10 -6 ~ 1.6 × 10 -6 / ℃).Meet the requirements of the vortex close to the sensor's high resistivity, small ratio, and strong anti -interference capacity for iron oxygen materials, especially suitable for the needs of the military industry. Background technique [0002] Electric vortex flow is close to the switch, commonly known as inductance close to the switch. It uses the energy coupling between the magnetic field to achieve the detection of the measurement of the measurement.The advantages of long life, fast response, and small volume are widely used...

AI Technical Summary

Problems solved by technology

[0005] As we all know, the ferrite core confines most of the magnetic field in the working area, but some of the magnetic field is still scattered in the air, resulting in a limited improvement in the sensing distance and sensitivity of the proximity switch coil, and the scattered magnetic field will interfere with the surrounding electromagnetic environment. , which will affect the sensitivity of the proximity switch

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