Ni-free MnZn ferrite magnetic core with double characteristics and manufacture method

A ferrite magnetic and dual-characteristic technology, applied in the field of MnZn soft magnetic ferrite materials and manufacturing, can solve the problems of high price and high production cost of ferrite materials, and achieve the effect of excellent product performance and cost reduction

Active Publication Date: 2014-01-08
江门安磁电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The inventor's published invention patent CN102682946A is currently the only technical solution that takes into account the dual characteristics of high temperature, high Bs and wide temperature and low loss, but it needs to add the oxide of the second auxiliary component Ni. Oxygen materials are expensive to produce

Method used

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  • Ni-free MnZn ferrite magnetic core with double characteristics and manufacture method
  • Ni-free MnZn ferrite magnetic core with double characteristics and manufacture method
  • Ni-free MnZn ferrite magnetic core with double characteristics and manufacture method

Examples

Experimental program
Comparison scheme
Effect test

example 1-9

[0038] 1) Using commercially available Fe 2 o 3 , Mn 3 o 4 , ZnO as the main material, according to the amount shown in Table 1 Fe 2 o 3 , MnO (raw material is Mn 3 o 4 ), ZnO and Co based on the main material 2500ppm 2 o 3 Put it in a sand mill, add 90wt% water of the total weight of the powder to the previously weighed powder, stir and grind to mix evenly; after spray drying, heat up to 900°C at a speed of 250°C / h Burn for 2h;

[0039] 2) Based on the total weight of the pre-fired powder, add additives: 1500ppm of Co 2 o 3 , 80ppm SiO 2 , 500ppm of CaCO 3 , 200ppm MoO 3 , 600ppm TiO 2 and 67wt% deionized water, 1.0wt% dispersant, and 0.8wt% defoamer for secondary grinding until the particle size of the powder is D50=0.92 μm, D90<2.3 μm;

[0040] 3) Based on the total weight of the powder after ball milling, add 7.5wt% polyvinyl alcohol solution to the powder, mix and granulate evenly, and use a 30-ton dry powder press to press the granules into a green sample;...

example 10～15

[0054] 1) as Fe 2 o 3 53.4mol%, MnO 40.3mol%, ZnO 6.3mol% as the main component formula to weigh Fe 2 o 3 , Mn 3 o 4 , ZnO raw materials are placed in a sand mill, the first auxiliary material and 90wt% water based on the total weight of the powder are added to the powder weighed above, stirred and ground to mix evenly, the amount of auxiliary materials added is shown in Table 2 ; After spray drying, heat up at a rate of 280°C / h to 1000°C for 1.5h;

[0055] 2) Based on the total weight of the pre-calcined powder, add the remaining auxiliary materials according to the addition amount shown in Table 2, and then add 65wt% deionized water, 1.2wt% dispersant, and 0.9wt% defoamer together Carry out secondary grinding until the particle size of the powder is D50=0.85μm, D90<2.1μm;

[0056] 3) Based on the total weight of the powder after ball milling, add 7.9wt% polyvinyl alcohol solution to the powder, mix and granulate evenly, and use a 45-ton dry powder press to press the g...

example 16～18

[0068] The raw material composition, powder preparation, and molding process are the same as in Example 11, except that the sintering temperature, holding time, and oxygen partial pressure are shown in Table 4.

[0069] Use HP4294A impedance analyzer (Agilent Technology 4294A) and special fixture (Agilent Technology 16047E) to measure the normal temperature inductance L of the sample magnetic ring under 10kHz weak field, and calculate the initial magnetic permeability of the material; use the SY-8258 B-H tester in Test the Bs of the sample magnetic ring at 50Hz, 1200A / m, and 100°C; use the Model 2335 Watt Meter to test the power loss of the sample magnetic ring at 100kHz, 200mT, and different temperature conditions. The results are listed in Table 4.

[0070] Table 4

[0071]

[0072] The sintering temperature and holding time are the most critical sections of the ferrite sintering temperature curve, which directly affect whether the solid-state reaction inside the material...

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Abstract

The invention provides a Ni-free MnZn ferrite magnetic core with double characteristics and a manufacture method thereof, wherein the double characteristics mean high temperature and high Bs, and wide temperature and low loss. The ferrite magnetic core comprises main components and auxiliary components. The main components comprise: 53 mol%-54 mol% of Fe2O3, 39 mol%-42 mol% of MnO and 4 mol%-7 mol% of ZnO; and the auxiliary components comprise: Co2O3 or CoO or Co3O4 as a first auxiliary component, SiO2 and CaCO3 as a second auxiliary, and a third auxiliary component which is one or more selected from MoO3, TiO2, SnO2, Nb2O5, V2O5, Sm2O3 and ZrO2. The provided MnZn ferrite magnetic core with double characteristics has unit volume loss Pcv (100kHz, 200mT) less than 350 kW / m<3> at the temperature of 25 DEG C to 120 DEG C, lowest loss of 300 kW / m<3> at the temperature of about 90 DEG C, and saturation magnetic flux density up to 450 mT at the temperature of 100 DEG C.

Description

technical field [0001] The invention relates to a MnZn soft ferrite material and a manufacturing method, in particular to a Ni-free MnZn soft ferrite core with dual characteristics of high temperature, high Bs and wide temperature and low loss, and a manufacturing method. Background technique [0002] Soft magnetic ferrite is a kind of magnetic material with the most varieties, the most widely used and the largest consumption, and it is an important basic functional material in the electronic information industry. In the production and use of soft magnetic ferrite, MnZn ferrite is dominant, and the output of MnZn ferrite accounts for about 70% of the total output of soft ferrite. It is currently the most concerned and active soft magnetic material. field. In recent years, the development of MnZn ferrite materials has shifted from the in-depth improvement of a single performance to the horizontal expansion of multiple indicators at the same time. For example, power ferrite ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/38C04B35/622
Inventor 黄爱萍谭福清豆小明汪南东
Owner 江门安磁电子有限公司
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