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High-frequency low-loss MnZn ferrite and preparation method thereof

A low-loss, ferrite technology, applied in the field of magnetic materials, can solve the problems of restricting the development of switching power supplies, low power loss, and large power consumption, and achieve the effects of superior product performance, low power consumption, and reduced high-frequency loss

Inactive Publication Date: 2012-06-20
WUXI SPINEL MAGNETICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the vast majority of MnZn power ferrite materials in my country can only work below 1MHz, and the few ferrites that can work at this frequency have very large power consumption, such as the MnZn ferrite produced by the existing technology. The power consumption of power ferrite is above 300mW / cm3 (1MHz 30mT 100℃), which greatly restricts the development of switching power supply in my country in the direction of high frequency. With the improvement of switching power supply technology and For new product development, there is an urgent need for MnZn ferrite materials that can work at 1-3MHz and have low power loss
[0003] In addition, the sintering temperature of MnZn ferrite in the prior art is generally 1300-1400°C, which consumes a lot of energy and pollutes heavily, and is incompatible with the current low-carbon life

Method used

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  • High-frequency low-loss MnZn ferrite and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] High-frequency low-loss MnZn ferrite, including main and auxiliary materials of the following components:

[0044] Main ingredient: Fe 2 o 3 : 50.2mol%;

[0045] MnO: 42mol%;

[0046] ZnO: balance;

[0047] Excipients: CaCO 3 : 0.25wt%;

[0048] V 2 o 5 : 0.6 wt%;

[0049] Nb 2 o 5 : 0.03wt%.

[0050] The preparation method of high-frequency low-loss MnZn ferrite comprises the following steps:

[0051] (1) Preparation of calcined material;

[0052] (2) Preparation of pellets;

[0053] (3) Low-temperature sintering: Use a press to press the granules into a green body, raise it to 450°C at 0.5°C / min, then rise to 900°C at 3°C / min, then rise to 1100°C at 0.5°C / min, and finally Rise to 1180°C at 1°C / min, hold and sinter at 6% oxygen partial pressure for 5 hours to obtain the required magnetic core.

[0054] The specific parameters of the high-frequency low-loss MnZn ferrite made by the above raw material formula and preparation method are as follows:

[0055...

Embodiment 2

[0067] High-frequency low-loss MnZn ferrite, including main and auxiliary materials of the following components:

[0068] Main ingredient: Fe 2 o 3 : 54mol%;

[0069] MnO: 36mol%;

[0070] ZnO: balance;

[0071] Excipients: CaCO 3 : 0.35 wt%;

[0072] V 2 o 5 : 0.04 wt%;

[0073] Nb 2 o 5 : 0.02wt%.

[0074] TiO 2 : 0.20 wt%;

[0075] CuO: 0.01 wt%.

[0076] The preparation method of high-frequency low-loss MnZn ferrite comprises the following steps:

[0077] (1) Preparation of calcined material;

[0078] (2) Preparation of pellets;

[0079] (3) Low-temperature sintering: Use a press to press the granules into a green body, raise it to 450°C at 1°C / min, then rise to 900°C at 1°C / min, then rise to 1100°C at 1°C / min, and finally Rise to 1250°C at 3°C / min, hold and sinter at 3% oxygen partial pressure for 3 hours to obtain the required magnetic core.

[0080] The performance parameters of high-frequency low-loss MnZn ferrite prepared by the above raw material fo...

Embodiment 3

[0088] High-frequency low-loss MnZn ferrite, including main and auxiliary materials of the following components:

[0089] Main material: Fe 2 o 3 : 53mol%;

[0090] MnO: 39mol%;

[0091] ZnO: balance;

[0092] Excipients: CaCO 3 : 0.3 wt%;

[0093] V 2 o 5 : 0.3wt%;

[0094] Nb 2 o 5 : 0.03wt%;

[0095] TiO 2 : 0.3 wt%;

[0096] CuO: 0.02 wt%.

[0097] The preparation method of high-frequency low-loss MnZn ferrite comprises the following steps:

[0098] (1) Preparation of calcined material;

[0099] (2) Preparation of pellets;

[0100] (3) Low-temperature sintering: Use a press to press the granules into a green body, raise it to 450°C at 1°C / min, then rise to 900°C at 2°C / min, then rise to 1100°C at 1°C / min, and finally Rise to 1225°C at 2°C / min, hold and sinter at 5% oxygen partial pressure for 4 hours to obtain the desired magnetic core.

[0101] Such as figure 1 as shown, figure 1 It is a comparison chart of the present invention and common sintering cu...

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Abstract

The invention discloses a high-frequency low-loss MnZn ferrite, which comprises major materials and auxiliary materials, wherein the major materials include 50.2-54mol% of Fe2O3, 36-42mol% of MnO and the balance ZnO, and the auxiliary materials include 0.25-0.35wt% of CaCO3, 0.04-0.6wt% of V2O5 and 0.02-0.03wt% of Nb2O5. The invention further discloses a preparation method of the high-frequency low-loss MnZn ferrite, which includes preparation of pre-sintering materials, preparation of particles and low-temperature sintering. The high-frequency low-loss MnZn ferrite can be safely and stably used under high-frequency conditions and has quite low power consumption, and the preparation method of the high-frequency low-loss MnZn ferrite has the advantages of energy saving and environment protection.

Description

technical field [0001] The invention relates to a magnetic material, in particular to a high-frequency low-loss MnZn ferrite, including its preparation method. Background technique [0002] MnZn ferrite cores are widely used in basic industries of the national economy such as national defense technology, communications, computers, radars, radio and television, medical and measuring instruments, entertainment consumer electronics, industrial and office automation, automotive electronics, and lighting. At present, the vast majority of MnZn power ferrite materials in my country can only work below 1MHz, and the few ferrites that can work at this frequency have very large power consumption, such as the MnZn ferrite produced by the existing technology. The power consumption of power ferrite is 300mW / cm 3 The above (1MHz 30mT 100°C) has greatly restricted the development of switching power supplies in the direction of high frequency in my country. With the improvement of switching...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
Inventor 黄舰
Owner WUXI SPINEL MAGNETICS