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Method for manufacturing intermediate-frequency low-loss MnZn ferrite magnetic core

A ferrite core and manufacturing method technology, applied in the direction of inductance/transformer/magnet manufacturing, inorganic material magnetism, electrical components, etc., can solve the problems of difficult uniform dispersion of nano-additives, easy agglomeration of nano-materials, high sintering temperature, etc., to achieve High saturation magnetic flux density, good powder activity, and low pre-burning temperature

Active Publication Date: 2010-10-13
江门江益磁材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the manganese-zinc ferrite core of the invention has excellent performances of high frequency, high saturation magnetic flux density and low loss, its production cost is high due to the use of nano-scale oxides as additives, and because nano-materials are easy to agglomerate , the nano-additives are not easy to disperse evenly during the production process
[0006] Therefore, it can be seen that the existing MnZn power ferrite materials, such as the manufacturing method of MnZn ferrite cores, have the disadvantages of high sintering temperature and high energy consumption, which lead to high manufacturing costs

Method used

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  • Method for manufacturing intermediate-frequency low-loss MnZn ferrite magnetic core
  • Method for manufacturing intermediate-frequency low-loss MnZn ferrite magnetic core
  • Method for manufacturing intermediate-frequency low-loss MnZn ferrite magnetic core

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Embodiment 1

[0032] Weigh the main component: 67wt% Fe with a purity of 99.3% or more 2 o 3 , 24wt% Mn 3 o 4 (Mn content is 71.1%), the purity of 9wt% is ZnO more than 99.7%, takes by weighing low-temperature flux simultaneously: CuO based on the CuO of 0.2wt% of main component gross weight; Add 80wt% water of the total weight of the powder to the material, stir and grind to mix evenly; after spray drying, pre-calcine at 800°C for 2 hours; based on the total weight of the pre-calcined powder, add additives: 0.04wt% CaCO 3 , 0.003wt% SiO 2 , 0.02wt% Nb 2 o 5 , 0.01wt% ZrO 2 And then add low temperature flux: 0.06wt% TiO 2, then add 60wt% of deionized water, 1wt% of dispersant, and 1wt% of defoamer for secondary grinding until the average particle size is 1.0±0.2μm; after drying, based on the total amount of ground powder Weight, in this powder, add the aqueous solution granulation of the polyvinyl alcohol of 8wt% (above each material can be purchased from the market); Green sample...

Embodiment 2

[0040] Weigh the main component: 70wt% Fe with a purity of 99.3% or more 2 o 3 , 23wt% Mn 3 o 4 (Mn content is 71.1%), the purity of 7wt% is 99.7% ZnO, weighs low-temperature flux simultaneously: based on the SnO of 0.25wt% of main component gross weight 2 and 0.25wt% TiO 2 ; In the sand mill, add 90wt% water of the total weight of the powder to the powder weighed above, stir and grind and mix evenly; after spray drying, pre-calcine at 780 ° C for 3 hours; based on the pre-calcined The total weight of the powder, adding additives: 0.05wt% CaCO 3 , 0.004wt% SiO 2 , 0.03wt% Nb 2 o 5 , 0.02wt% ZrO 2 And then add low temperature flux: 0.09wt% SnO 2 , and then add 70wt% deionized water, 1wt% dispersant, and 1wt% defoamer for secondary grinding, until the average particle size is 1.0±0.2μm; after drying, based on the total amount of ground powder Weight, in this powder, add the aqueous solution granulation of the polyvinyl alcohol of 8wt% (above each material can be purcha...

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Abstract

The invention provides a method for manufacturing an intermediate-frequency low-loss MnZn ferrite magnetic core. The method comprises the following steps of: A, preparing materials; B, grinding and mixing; C, pre-sintering; D, performing secondary grinding; E, pelleting; F, molding; and G, sintering. By adding a low-temperature fluxing agent, the solid-phase reaction is accelerated, so that the pre-sintering temperature is reduced, and the energy can be greatly saved on the basis of achieving the same effect of the solid-phase reaction. In addition, due to low pre-sintering temperature and better activity of the powder, the reaction can be carried out at low temperature. Therefore, the sintering temperature is reduced, and the energy is also saved. Meanwhile, the manufactured MnZn ferrite magnetic core has the advantages of lower loss and higher saturation magnetic flux density.

Description

technical field [0001] The invention relates to a method for manufacturing a MnZn ferrite core, in particular to a method for manufacturing an intermediate frequency low-loss MnZn ferrite core. Background technique [0002] Since the advent of power ferrite (LPL) materials, MnZn ferrite core materials have been receiving attention and have been widely used in the field of switching power supply transformers. With the continuous improvement of the manufacturing process, the development trend of ferrite materials, especially its high frequency and low loss, is very rapid. For example, Japan's TDK company has developed a loss-free ferrite with a working frequency of 100kHz-500kHz by using a spray roasting powder making process. PC40 (H7C4) and PC44 materials have dropped sharply, and Philips has launched 3F4 with a working frequency of 2MHz, and even 3F5 materials with a working frequency of 4MHz. Although the high-frequency development of MnZn ferrite materials is very rapid,...

Claims

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Application Information

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IPC IPC(8): H01F1/34H01F41/02B22F9/04B22F3/12C04B35/26C04B35/645
Inventor 汪南东谭福清黄爱萍豆小明王家永冯则坤
Owner 江门江益磁材有限公司
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