Method for manufacturing ferromagnetic core containing silicon dioxide

A technology of silicon dioxide and production method, which is applied in the direction of inductance/transformer/magnet manufacturing, inorganic material magnetism, electrical components, etc., to achieve the effects of uniform crystal grains, low porosity, and stable electromagnetic properties

Active Publication Date: 2013-09-11
TIANCHANG CITY ZHAOTIAN MAGNETOELECTRICITY TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Now the electronic communication industry needs ferrite cores with low core loss and high magnetic permeability to meet the miniaturization a

Method used

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Embodiment 1

[0013] Embodiment 1: the manufacture method of the ferromagnetic core containing silicon dioxide, comprises the following steps:

[0014] (1) Pre-fired mixture: The molarity of the mixture A is Fe 2 o 3 70mol, MnO 22mol, ZnO 4mol, aluminum nitride 0.18mol, copper 0.18mol, boron 0.04mol, aluminum 0.35 mol, silicon dioxide 0.17 mol, titanium dioxide 0.20 mol, tin 0.07 mol; Components in the following proportions by weight: 55ppm MoO 3 , 110ppm V 2 o 5 、85ppm Bi 2 o 3 , 32ppm boron oxide, 70ppm zirconia, 22ppm barium oxide, 320ppm Ti, and 200ppm Ni; accurately weigh mixture A and mixture B respectively, and mix them separately in a mixing tank, stirring and mixing at 3500-4200 rpm for 3 hours After that, they are sent to the rotary kiln for pre-burning respectively, the temperature is controlled at 360-450° C., and the pre-burning time is 2.5 hours to obtain pre-fired mixture A and mixture B;

[0015] (2) Grinding: Send the mixture A and B pre-fired in step (1) to the gri...

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PUM

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Abstract

The invention discloses a method for manufacturing a ferromagnetic core containing silicon dioxide. The method include steps of performing pre-sintering on a mixture A comprising Fe<2>O<3>, MoO, ZnO, aluminum nitride, copper, boron, aluminum, the silicon dioxide, titanium dioxide and tin and a mixture B comprising MoO<3>, V<2>O<5>, Bi<2>O<3>, boron dioxide, zirconium dioxide, barium dioxide, Ti and Ni; then sequentially performing grinding, mixing and pulping, powder spray-drying, green body pressing and sintering processes on the mixture A and the mixture B to obtain the ferromagnetic core. The method has the advantages that owing to an optimized formulation design and the sintering process, the initial permeability of a product manufactured by the method is 15000, cracking of the sintered product is little, the qualified rate of the product reaches 95% at least, the product is high in grain boundary resistivity and low in porosity, crystal grains of the product are large and uniform, the impendence characteristic of the product in a high-frequency range is excellent, various electromagnetic properties of the product are stable, and the ferromagnetic core product is applicable to various electronic fields.

Description

technical field [0001] The invention relates to the field of manufacturing oxide magnetic materials, in particular to a method for manufacturing a ferromagnetic core containing silicon dioxide. Background technique [0002] With the development of communication technology and digitalization of electronic products, new requirements are put forward for soft ferrite and components. High-performance and high-permeability magnetic cores are widely used in various basic materials for telecommunications and information, such as common-mode filters, Saturated inductors, current transformers, leakage protectors, insulation transformers, signal and pulse transformers and other fields have been widely used. Now the electronic communication industry needs ferrite cores with low core loss and high magnetic permeability to meet the miniaturization and high efficiency requirements of current electrical equipment. The existing magnetic cores are difficult to meet the above requirements. C...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/11C04B35/64
Inventor 徐杰杨从会黄国祥刘京州曾性儒张忠仁王玉志
Owner TIANCHANG CITY ZHAOTIAN MAGNETOELECTRICITY TECH
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