Method for preparing MnZn ferrite magnetic core by multi-physical field coupling

A ferrite core, multi-physics technology, applied in inductor/transformer/magnet manufacturing, inorganic material magnetism, electrical components, etc., can solve the problem of segregation of manganese-zinc ferrite bulk composition and uneven particle size distribution , affecting the discharge between particles, etc., to achieve the effect of shortening the preparation time, shortening the heating time, and reducing the process

Inactive Publication Date: 2013-03-20
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sintering process is as follows: heat the sample powder to 800°C at an average heating rate of 80°C / min, pressurize to 9KN, keep it warm for 4 minutes, then turn off the power and cool naturally to obtain a block sample with spinel ferrite magnetic material , its density reaches 96.8% of the theoretical density, but the composition of the manganese-zinc-ferrite block sintered by this technology has segregation, and there is a phenomenon of uneven particle size distribution
Since the SPS technology uses the instantaneous high-temperature field generated by pulse energy, discharge pulse pressure and Joule heat to realize the sintering process, it greatly shortens the heating time and sintering time compared with the traditional process of preparing MnZn ferrite, and reduces However, since the SPS technology uses interparticle discharge to generate plasma to realize the sintering process, too large or too small pressure will affect the interparticle discharge. Therefore, it is difficult to control the applied pressure when sintering MnZn ferrite with SPS technology.

Method used

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  • Method for preparing MnZn ferrite magnetic core by multi-physical field coupling
  • Method for preparing MnZn ferrite magnetic core by multi-physical field coupling
  • Method for preparing MnZn ferrite magnetic core by multi-physical field coupling

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Experimental program
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Effect test

Embodiment 1

[0019] The prepared pre-fired MnZn ferrite powder with a particle size of 1 μm was weighed and filled in the mold, fixed with a chuck, and placed in a 10 -2 Under the vacuum condition of Pa, a force of 70Mpa is applied to both ends of the mold, a current is passed through to heat the powder, and the temperature rise rate is controlled at 15°C / s to 900°C, and then cooled to room temperature at 15°C / s, and the magnetic core is taken out. Can. Then the magnetic properties of the sample were measured at 1 MHz with a Lake shore7410 vibrating sample magnetometer, and the results are shown in Table 1.

[0020] Table 1

[0021]

Embodiment 2

[0023] The prepared pre-fired MnZn ferrite powder with a particle size of 1 μm was weighed and filled in the mold, fixed with a chuck, and placed in a 10 -2 Under the vacuum condition of Pa, a force of 70Mpa is applied to both ends of the mold, and a current is applied to heat the powder, and the temperature rise rate is controlled at 15°C / s to 800°C, and then the temperature is lowered to 400°C at 15°C / s, and the heating cycle is 5 times , keep warm at 800°C for 4min, cool to room temperature at 15°C / s, and take out the magnetic core. Then, the magnetic properties of the sample were measured at 1 MHz with a Lake shore7410 vibrating sample magnetometer, and the results are shown in Table 2.

[0024] Table 2

[0025]

Embodiment 3

[0027] The prepared pre-fired MnZn ferrite powder with a particle size of 1 μm was weighed and filled in the mold, fixed with a chuck, and placed in a 10 -2 Under the vacuum condition of Pa, a force of 70Mpa is applied to both ends of the mold, and a current is applied to heat the powder, and the heating rate is controlled to rise to 900°C at 15°C / s, and then to drop to 500°C at 15°C / s, and the heating cycle is 5 times , cool to room temperature at 15°C / s, and take out the magnetic core. Then the magnetic properties of the sample were measured at 1 MHz with a Lake shore7410 vibrating sample magnetometer, and the results are shown in Table 3.

[0028] table 3

[0029]

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Abstract

The invention discloses a method for preparing an MnZn ferrite magnetic core by multi-physical field coupling. The method comprises the following steps of filling MnZn ferrite powder having particle sizes of 0.7 to 2.0 micrometers into a mold, directly powering on the mold with the MnZn ferrite powder to fast heat the mold at a heating rate of 5 to 200 DEG C/s under the pressure of 10<-2> Pa, simultaneously, applying an acting force of 50 to 100MPa to two ends of the mold, heating to a temperature of 600 to 1200 DEG C under the action of a continuous electric field, carrying out heat preservation for 2 to 10min so that the MnZn ferrite powder undergoes a solid-phase reaction in the mold and is molded fast, interrupting power supply, and taking out a sintered body. The method has the advantages that a heating rate is greatly improved so that diffusion between atoms is promoted; and through the pressure on the two ends of the mold, a MnZn ferrite magnetic core solid-phase reaction, compaction molding and compact sintering are carried out simultaneously so that performances of a molded magnetic core are guaranteed.

Description

technical field [0001] The invention belongs to the technical field of sintering and preparing MnZn ferrite cores, in particular to a MnZn ferrite core with high saturation magnetic flux density, high permeability and low loss prepared by rapid sintering under the action of force, heat and electricity. Oxygen core method. Background technique [0002] In today's world, the role of magnetic materials in high-tech applications is becoming more and more obvious. Magnetic components made of magnetic materials have the functions of converting, transmitting, processing information, storing energy, etc., and have been widely used in telecommunications, automatic control, communications, household appliances, biology, medical and health, light industry, mineral processing, physical prospecting, Military and other fields. Soft magnetic material refers to a magnetic material that is easy to magnetize and demagnetize under a weak magnetic field. With the rapid development of the ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622H01F1/34H01F41/02
Inventor 杨屹杨刚尹德强黄坤兰
Owner SICHUAN UNIV
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