Mn-Zn soft magnetic ferrite and production method

A soft ferrite, mn-zn technology, applied in inductor/transformer/magnet manufacturing, inorganic material magnetism, electrical components, etc., can solve problems such as low permeability, power consumption, and increased coil copper wire loss, etc. Achieve high saturation magnetic flux density and small permeability change

Inactive Publication Date: 2008-08-13
KUSN NICERA ELECTRICAL APPLIANCE
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  • Application Information

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Problems solved by technology

At the same time, due to the low magnetic permeability, the required inductance value must be achieved by increasing the number of winding turns, and the increase in the number of winding turns increases the copper wire loss of the coil itself to a certain extent, which brings a certain amount of power consumption. The problem

Method used

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  • Mn-Zn soft magnetic ferrite and production method
  • Mn-Zn soft magnetic ferrite and production method
  • Mn-Zn soft magnetic ferrite and production method

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Experimental program
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Effect test

Embodiment 1

[0026] Embodiment 1: a kind of Mn-Zn system soft magnetic ferrite, mainly by Fe 2 o 3 , Mn 3 o 4 and ZnO composition, where Mn 3 o 4 Calculated by MnO, by Fe 2 o 3 : 54.1mol%, MnO: 37.1mol% and ZnO: 8.8mol% are measured and mixed, pre-calcined with a push-type pre-sintered furnace (950 ° C × 2 hours), after 20 minutes of pulverization, and then dopant: SiO 2 : 0.005wt%, CaO: 0.04wt%, Nb 2 o 5 : 0.02wt%, V 2 o 5 : 0.05wt%, dopant wt% refers to Fe 2 o 3 , Mn 3 o 4 and the total weight ratio of ZnO.

[0027] Simultaneously add the CoO of dopant as following table 1 and drop into sand mill (CoOwt% in table 1 refers to relative to Fe 2 o 3 , Mn 3 o 4 and the total weight ratio of ZnO. )

[0028] Add additives according to the following ratio: deionized pure water: 40-50wt%, binder: 0.5-1.5wt%, dispersant: 0.1-0.5wt% and defoamer: within 0.1wt% and the value is greater than zero, carry out For sanding, additive wt% refers to Fe 2 o 3 , Mn 3 o 4 and the tota...

Embodiment 2

[0035] Use high-purity Fe according to the formula in Table 2 below 2 o 3 , Mn 3 o 4 , ZnO for proportioning, pre-sintering conditions still use a push-type pre-sintering furnace at 950°C for 2 hours for pre-sintering, and also use 20 minutes of crushing;

[0036] Add dopant SiO 2 : 0.005wt%), CaO: 0.04wt%, Nb 2 o5 : 0.02wt% and V 2 o 5 : 0.05wt%, dopant wt% refers to Fe 2 o 3 , Mn 3 o 4 and the total weight ratio of ZnO.

[0037] Also add dopant CoO: 0.3wt%, CoOwt% refers to relative to Fe 2 o 3 , Mn 3 o 4 and the total weight ratio of ZnO.

[0038] Add additives: deionized pure water: 40-50wt%, binder: 0.5-1.5wt%, dispersant: 0.1-0.5wt%, and defoamer: within 0.1wt% and the value is greater than zero; sanding, additives wt% refers to Fe 2 o 3 , Mn 3 o 4 and the total weight ratio of ZnO.

[0039] Use a spray granulation tower to dry and granulate at about 100°C. The obtained raw materials were molded and sintered at 1300°C×5 hours while controlling the o...

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Abstract

The present invention discloses a Mn-Zn series ferrite and the preparing technique thereof. The raw material is prepared with the adjusting of the main formula and the adjusting of the kind and dosage of the adulterant (especially CoO is used). When the raw material is provided higher magnetic conductivity and stable magnetic conductivity change rate in broad temperature range, the raw material is provided with high saturation flux density. The range of the main formula of the material is as follows: Fe2O3 for 53.7-54.4mol, MnO for 36-38mol, and ZnO for 8-10mol The invention is mainly characterized in that the adding amount of CoO is 0.05-0.6wt Therefore the invention has the advantages of small initial permeability variation in broad temperature range and high saturation flux density. The technique of the invention is simple and can be actualized with generalization.

Description

technical field [0001] The invention relates to a ferrite sintered product with small change in initial magnetic permeability (μi) and high saturation magnetic flux density in a wide temperature range and a production method, especially a Mn-Zn soft magnetic ferrite and a production method. Suitable for transformers used in communication equipment and filters in digital amplifiers. Background technique [0002] Magnetic cores used in transformers for communications and filters in digital amplifiers require magnetic properties such as high permeability, high saturation flux density, and low loss. In recent years, with the development of miniaturization and high integration of electronic products, the magnetic core (the electrical performance of the magnetic core) is required to have a certain degree of stability in temperature changes caused by self-heating and environmental temperature changes. Compared with high-permeability materials that fluctuate greatly with temperatur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/34H01F41/02C04B35/26C04B35/622
Inventor 昌子裕之曹之凡蔡建华
Owner KUSN NICERA ELECTRICAL APPLIANCE
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