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High-permeability, high-frequency, high-impedance and high-Curie-temperature manganese-zinc ferrite material and preparation method thereof

A technology of manganese zinc ferrite and high magnetic permeability, which is applied in the direction of magnetic materials, inductance/transformer/magnet manufacturing, magnetic objects, etc., can solve the problem that the magnetic permeability is lower than 10000, achieve high magnetic permeability, improve Effects of Curie temperature and grain size increase

Inactive Publication Date: 2021-02-05
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another example is that the Chinese patent document CN111056830A discloses a manganese-zinc ferrite material with a wide temperature, high frequency, high impedance and high magnetic permeability. 2 o 3 , Mn 3 o 4 , ZnO as the main component of ferrite, while adding TiO 2 , NiO, MoO 3 , SiO 2 and Bi 2 o 3 As an auxiliary component, the initial magnetic permeability at room temperature can reach more than 12,000, but the Curie temperature is only 137°C
Another example is that the Chinese patent document CN106747396A discloses a high-permeability manganese-zinc ferrite material for automotive electronics and a preparation method thereof. The ferrite material of this invention is composed of a main material and a dopant, and the main material includes: 52 ~53mol%Fe 2 o 3 , 17~20.5mol% ZnO, the rest is MnO, additives are CuO and CaCO of analytically pure grade 3 、 Ta 2 o 5 、In 2 o 3 、 Bi 2 o 3 , the Curie temperature of the ferrite material of the invention reaches 150°C, the magnetic permeability is only about 10,000, and there are cases where the magnetic permeability is lower than 10,000 between the second peak position and the first peak position

Method used

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  • High-permeability, high-frequency, high-impedance and high-Curie-temperature manganese-zinc ferrite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] will be proportioned as Fe 2 o 3 52.80mol%, MnO 26.90mol%, ZnO 20.30mol% (converted to mass percentage as Fe 2 o 3 : 69.48wt%, Mn 3 o 4 : 16.91wt%, ZnO: 13.62wt%) three main raw materials are mixed by ball milling once, then calcined at 850°C, and the auxiliary component CaCO is added to the calcined material 3 200ppm, Bi 2 o 3 400ppm, Co 2 o 3 500ppm, MoO 3 200ppm, mixed through secondary ball milling, drying, granulation, pressing and molding, and finally sintered in a pusher kiln. The sintering process is: heating to 1000°C at a heating rate of 2°C / min, and the sintering atmosphere at this stage is air , and then heated to 1410°C at a heating rate of 0.8°C / min, and held for 6 hours. Slow down to room temperature.

[0039] Using 10 turns of winding, the temperature characteristics of the permeability at a voltage of 0.25v and a frequency of 10KHz are measured on the 3302 instrument, and the frequency characteristics of the permeability and impedance at ...

Embodiment 2

[0041] will be proportioned as Fe 2 o 3 52.00mol%, MnO 27.60mol%, ZnO 20.40mol% (converted to mass percentage as Fe 2 o 3 : 68.80wt%, Mn 3 o 4 : 17.44wt%, ZnO: 13.76wt%) three main raw materials are ball milled and mixed once, and then calcined at 850°C, and the auxiliary component CaCO is added to the calcined material 3 200ppm, Bi 2 o 3 400ppm, Co 2 o 3 500ppm, MoO 3 200ppm, mixed through secondary ball milling, drying, granulation, pressing and molding, and finally sintered in a pusher kiln. The sintering process is: heating to 1000°C at a heating rate of 2°C / min, and the sintering atmosphere at this stage is air , and then heated to 1410°C at a heating rate of 0.8°C / min, and held for 6 hours. Slow down to room temperature.

[0042] Using 10 turns of winding, the temperature characteristics of the permeability at a voltage of 0.25v and a frequency of 10KHz are measured on the 3302 instrument, and the frequency characteristics of the permeability and impedance...

Embodiment 3

[0044] The blank with the same formula as in Example 2 is used for debinding and sintering in a pusher kiln. The sintering process is: heating to 1000°C at a heating rate of 2°C / min, the sintering atmosphere at this stage is air, and then at a temperature of 1.5°C / min The heating rate was heated to 1360°C, and the temperature was maintained for 6 hours. The oxygen partial pressure concentration was controlled at 5vol%. After cooling to 1100°C, the oxygen partial pressure concentration was controlled below 0.03vol%.

[0045] Using 10 turns of winding, the temperature characteristics of the permeability at a voltage of 0.25v and a frequency of 10KHz are measured on the 3302 instrument, and the frequency characteristics of the permeability and impedance at a voltage of 0.25v are measured on the 3302 instrument. The test results are shown in Table 1-3.

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Abstract

The invention belongs to the technical field of soft magnetic ferrite materials, and discloses a high-permeability, high-frequency, high-impedance and high-Curie-temperature manganese-zinc ferrite material and a preparation method thereof. The high-permeability, high-frequency, high-impedance and high-Curie-temperature manganese-zinc ferrite material is composed of a main component and an auxiliary component. The main component is composed of the following raw materials in mole percentage: 52-54 mol% of Fe2O3, 18-22 mol% of ZnO and the balance of MnO. Based on the total amount of the main component, the auxiliary component is composed of the following raw materials: 200-1000 ppm of CaCO3, 200-1000 ppm of Bi2O3, 200-1000 ppm of Co2O3, and 200-1000 ppm of MoO3. The manganese-zinc ferrite material prepared by adopting the formula and the process has the characteristics of high magnetic conductivity, high frequency, high impedance and high Curie temperature: the initial magnetic rate [mu]i(25 DEG C) is more than or equal to 12000, the Tc is more than or equal to 150 DEG C, and the impedance coefficient is more than or equal to 26 ohm / mm within the range of 0.5-1.0 MHz.

Description

technical field [0001] The invention relates to the technical field of soft magnetic ferrite materials, in particular to a high-permeability, high-frequency, high-impedance, high-Curie-temperature manganese-zinc ferrite material and a preparation method thereof. Background technique [0002] With the rapid development and widespread application of electronic technologies such as mobile communications, satellite communications, and computers, an invisible pollution that we cannot perceive has formed around us—electromagnetic interference (EMI) caused by radiation and leakage of electronic products. EMI not only interferes with the electronic equipment itself, thereby affecting the normal operation of the electronic equipment, but also poses a certain threat to human health. Therefore, people use anti-electromagnetic interference materials to eliminate electromagnetic interference caused by electromagnetic radiation and leakage. [0003] As an anti-electromagnetic interference...

Claims

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Application Information

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IPC IPC(8): C04B35/38C04B35/622C04B35/626C04B35/64H01F1/34H01F41/00
CPCC04B35/2633C04B35/265C04B35/622C04B35/6261C04B35/62675C04B35/62695C04B35/64H01F1/344H01F41/00C04B2235/3284C04B2235/3275C04B2235/3262C04B2235/3208C04B2235/3256C04B2235/3298C04B2235/608C04B2235/6583C04B2235/6584C04B2235/6562C04B2235/6565C04B2235/6567C04B35/26C04B2235/3212C04B35/62615C04B35/62625C04B2235/604C04B2235/77
Inventor 朱勇王朝明赵旭
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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