Method for manufacturing ferromagnetic core loaded with boric oxide
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A production method, boron oxide technology, applied in the direction of inductance/transformer/magnet manufacturing, inorganic material magnetism, electrical components, etc., to achieve the effects of less cracking, high grain boundary resistivity, and stable electromagnetic properties
Active Publication Date: 2013-09-11
TIANCHANG CITY ZHAOTIAN MAGNETOELECTRICITY TECH
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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
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Embodiment 1
[0013] Embodiment 1: the manufacture method of the ferromagnetic core of loading boron oxide, comprises the following steps:
[0014] (1) Pre-fired mixture: the molar amount of mixture A is Fe 3 o 4 75mol, 26mol of manganese oxide, 0.50mol of boron oxide, 0.22mol of zirconium fluoride, 0.14mol of nickel oxide, 0.35mol of borax, 0.52mol of iron oxide powder and 0.65mol of aluminum powder; Proportional components: 53ppm Tantalum, 165ppm Titanium, 350ppm Tungsten, 80ppm MoO 3 , 180ppm Nb 2 o 5 , 450ppm magnesium carbonate, 335ppm lanthanum oxide and 500ppm barium carbonate; Accurately weigh mixture A and mixture B respectively, use mixing tank to mix separately, stir and mix at 5000 rpm after 3.0 hours, and then send them into the rotary kiln Pre-burning, control the temperature at 420°C, and the pre-burning time is 2-3 hours to obtain the pre-fired mixture A and mixture B;
[0015] (2) Grinding: The mixtures A and B pre-fired in step (1) are sent to the grinding tank for g...
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Abstract
The invention discloses a method for manufacturing a ferromagnetic core loaded with boric oxide. The method includes steps of performing pre-sintering on a mixture A comprising Fe<3>O<4>, manganese oxide, the boric oxide, zirconium fluoride, nickel oxide, borax, ferric oxide powder and aluminum powder and a mixture B comprising tantalum, titanium, tungsten, MoO<3>, Nb<2>O<5>, magnesium carbonate, lanthanum oxide and barium carbonate; 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 12500, cracking of the sintered product is little, the qualified rate of the product reaches 93.0% 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 loaded with boron oxide. 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. Cont...
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Patent Type & Authority Applications(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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