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A method for manufacturing a ferromagnetic core containing modified aluminum nitride

A production method, aluminum nitride technology, applied in the direction of inductor/transformer/magnet manufacturing, inorganic material magnetism, electrical components, etc., to achieve the effect of high grain boundary resistivity, excellent impedance characteristics, large and uniform grains

Active Publication Date: 2016-07-06
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 and high efficiency requirements of current electrical equipment, and the existing magnetic cores are difficult to meet the above requirements

Method used

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Embodiment 1

[0014] Embodiment 1: the manufacture method of the ferromagnetic core containing modified aluminum nitride, comprises the following steps:

[0015] (1) Pre-fired mixture: The molarity of the mixture A is Fe 2 o 3 78mol, MnO16mol, ceramic powder 0.15mol, boron 0.07mol, titanium 0.05mol, aluminum hydroxide 0.30mol, modified aluminum nitride 0.17mol and bentonite 0.45mol; Mixture B is equivalent to the following ratio of the total weight of Mixture A Composition: 720ppmSiO 2 , 118ppmNb 2 o 5 , 155ppm yttrium oxide, 115ppm tantalum oxide, 260ppmAl, 155ppm tin, 380ppm vanadium, and 260ppm rubidium; respectively accurately weigh mixture A and mixture B, and mix them separately in a mixing tank. The mixing time is 2-3 hours at 4200 rpm. Hours later, they are then sent to a rotary kiln for pre-burning, the temperature is controlled at 400°C, and the pre-burning time is 2-3 hours to obtain pre-fired mixture A and mixture B;

[0016] The preparation method of the modified aluminum ...

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Abstract

The invention discloses a method for manufacturing a ferromagnetic core containing modified aluminum nitride. The method includes steps of performing pre-sintering on a mixture A comprising Fe<2>O<3>, MoO, ceramic powder, boron, titanium, aluminum hydroxide, the modified aluminum nitride and bentonite and a mixture B comprising SiO<2>, Nb<2>O<5>, yttrium oxide, tantalum oxide, Al, tin, vanadium and rubidium; 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 total weight of the mixture B is equivalent to that of the mixture A. 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 20000, cracking of the sintered product is little, the qualified rate of the product reaches 94.5% 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 modified aluminum nitride. 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 require...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02H01F1/33C04B35/64
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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