Preparation method of ultra-low-loss MnZn power ferrite material

A technology of ferrite material and manufacturing method, which is applied in the manufacturing field of MnZn soft ferrite material, can solve the problems of low efficiency, increased manufacturing cost, complicated process, etc., and achieves low power loss, reduced loss and low cost. Effect

Active Publication Date: 2014-04-02
江门安磁电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method needs to desulfurize the raw materials first, the process is complicated and inefficient, and the desulfurization process increases the manufacturing cost

Method used

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  • Preparation method of ultra-low-loss MnZn power ferrite material
  • Preparation method of ultra-low-loss MnZn power ferrite material
  • Preparation method of ultra-low-loss MnZn power ferrite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-9

[0034] Prepare MnZn power ferrite material according to the following method:

[0035] 1) Using commercially available Fe 2 o 3 (purity ≥ 99.3%), Mn 3 o 4 (Mn content ≥ 71%), ZnO (purity ≥ 99.7%) as the main material, according to the amount shown in Table 1 Fe 2 o 3 , Mn 3 o 4 , ZnO is placed in a sand mill, stirred and ground to mix evenly; after drying, the temperature is raised to 900°C at a speed of 250°C / h and pre-fired for 2 hours;

[0036] 2) Based on the total weight of the pre-burned powder, add additives: Fe 2 o 3 (the amount added is listed in Table 1), 600ppm of Co 2 o 3, 60ppm SiO 2 , 500ppm of CaCO 3 , 600ppm TiO 2 and deionized water, dispersant, and defoamer for secondary grinding, until the particle size of the powder is D50=0.90μm, D90<2.5μm;

[0037] 3) Based on the total weight of the powder after ball milling, add 9.5wt% polyvinyl alcohol solution to the powder, mix and granulate evenly, and use a 45-ton dry powder press to press the granule...

Embodiment 10～15

[0050] 1) Fe 2 o 3 69.0wt%, Mn 3 o 4 24.0wt%, ZnO 7.0wt% as the main component formula to weigh Fe 2 o 3 (purity ≥ 99.3%), Mn 3 o 4 (Mn content ≥ 71%), ZnO (purity ≥ 99.7%) raw materials are placed in a sand mill, stirred and ground to mix and dry evenly, then heat up to 800 ℃ at a speed of 280 ℃ / h and pre-fire for 3 hours;

[0051] 2) Based on the total weight of the calcined powder, add 2wt% Fe 2 o 3 , and add auxiliary ingredients according to the addition amount shown in Table 2, then add deionized water, dispersant, and defoamer to carry out the second grinding, and grind until the particle size of the powder is D50=0.87μm, D90<2.3μm;

[0052] 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 45-ton dry powder press to press the granules into a green compact with a density of 3.0±0.2 g / cm 3 green samples of

[0053] 4) Finally, sinter at a sintering tempera...

Embodiment 16-21

[0064] The ferrite material was prepared according to the same raw material composition and preparation method as in Example 11, except that the values ​​of a and b of the sintering atmosphere are shown in Table 4. The present invention adopts secondary reduction sintering method during sintering, and the cooling process keeps equilibrium oxygen partial pressure, and equilibrium oxygen partial pressure is according to formula log (P (O 2 ))=a–b / T calculation, where a takes a value of 5-9, b takes a value of 11000-15000, and T is the absolute temperature.

[0065] 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 Model 2335 Watt Meter to test the sample magnetic ring The results of power loss under 100kHz, 200mT and different temperature conditions are l...

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Abstract

The invention provides a preparation method of an ultra-low-loss MnZn power ferrite material. The method has ultra-low power consumption and is prepared by the method comprising the following steps of: getting 68 to 72wt% of Fe2O3, 6 to 9wt% of ZnO, and the balance of Mn3O4 in percentage by weight as the raw materials, and then performing batching, grinding for the first time, pre-sintering, grinding for the second time, granulating, molding, sintering and other processes. The manufacture method is innovated in that the bias of the prior art that increase of Fe2O3 leads to obvious lowering of two-peak temperature is removed, and little Fe2O3 is added during grinding for the second time so that the effect of obviously reducing the power consumption and slightly lowering the two-peak temperature is realized, and thus ultra-low loss at the temperature of 100 DEG C can be achieved.

Description

technical field [0001] The invention relates to a manufacturing method of MnZn soft magnetic ferrite material, in particular to a manufacturing method of ultra-low loss MnZn power ferrite material. 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. [0003] For MnZn power ferrite materials, in addition to further reducing the loss of the material, i...

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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