Low temperature coefficient, low loss and high saturated flux density ferrite material and preparing method

A low temperature coefficient, ferrite material technology, applied in the magnetic direction of inorganic materials, can solve the problems of high design and manufacturing requirements of sintering furnace, deterioration of loss and temperature coefficient, increase of steel ball loss, etc., and achieve wide pre-sintering and sintering temperature The scope, product consistency is good, and the effect of raw material cost reduction

Inactive Publication Date: 2005-03-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At such a high sintering temperature, the grains tend to grow abnormally, and the grains become uneven, resulting in loss and deterioration of the temperature coefficient; and such a high sintering temperature has high requirements for the design and manufacture of the sintering furnace, which consumes a lot of energy. Not conducive to environmental protection and cost reduction
Moreover, due to the high pre-burning temperature, the hardness of the pre-fired material increases, making the pre-fired material difficult to crush during the secondary crushing process, increasing the loss of steel balls in the ball milling process, and easily bringing in a large amount of impurities

Method used

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  • Low temperature coefficient, low loss and high saturated flux density ferrite material and preparing method
  • Low temperature coefficient, low loss and high saturated flux density ferrite material and preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] 1) selection of raw material: the raw material of the low-temperature sintered NiZn ferrite material provided by the invention selects industrially pure Fe 2 o 3 , ZnO, NiO, Mn 3 o 4 and CuO.

[0062] 2) Composition design and weighing: according to Fe 2 o 3 49mol%; ZnO is 26mol%; CuO is 10mol%; MnO is 3mol%; NiO is 12mol% Fe 2 o 3 , ZnO, CuO, Mn 3 o 4 And NiO, where MnO:CuO is 1:3.3.

[0063] 3) Mixing of raw materials: Put the weighed raw materials into a ball mill, add deionized water of equal weight, and ball mill for 5 hours.

[0064] 4) Pre-burning: Dry the mixed and ground raw materials and put them into the furnace for pre-burning. The pre-firing temperature is 780°C, the pre-firing time is 3 hours, the atmosphere is air, and it is cooled with the furnace after pre-firing. After pre-burning, XRD phase analysis was carried out on the pre-fired material, and it was confirmed that only spinel structure existed in the pre-fired material without other impu...

Embodiment 2

[0073] 1) selection of material: the raw material of the low-temperature sintered NiZn ferrite material provided by the invention selects industrially pure Fe 2 o 3 , ZnO, NiO, Mn 3 o 4 and CuO.

[0074] 2) Composition design and weighing: according to Fe 2 o 3 49mol%; ZnO is 23mol%; CuO is 15mol%; MnO is 3mol%; NiO is 10mol% Fe 2 o 3 , ZnO, CuO, Mn 3 o 4 And NiO, where MnO:CuO is 1:5.

[0075] 3) Mixing of raw materials: Put the weighed raw materials into a ball mill, add deionized water of equal weight, and ball mill for 5 hours.

[0076] 4) Pre-burning: Dry the mixed and ground raw materials and put them into the furnace for pre-burning. The pre-firing temperature is 740°C, the pre-firing time is 3 hours, the atmosphere is air, and it is cooled with the furnace after pre-firing. After pre-burning, XRD phase analysis was carried out on the pre-fired material, and it was confirmed that only spinel structure existed in the pre-fired material without other impurity p...

Embodiment 3

[0085] 1) selection of material: the raw material of the low-temperature sintered NiZn ferrite material provided by the invention selects industrially pure Fe 2 o 3 , ZnO, NiO, Mn 3 o 4 and CuO.

[0086] 2) Composition design and weighing: according to Fe 2 o 3 52mol%; ZnO is 35mol%; CuO is 5mol%; MnO is 2mol%; NiO is 18mol% Fe 2 o 3 , ZnO, CuO, Mn 3 o 4 And NiO, where MnO:CuO is 1:2.5.

[0087] 3) Mixing of raw materials: Put the weighed raw materials into a ball mill, add deionized water of equal weight, and ball mill for 5 hours.

[0088] 4) Pre-burning: Dry the mixed and ground raw materials and put them into the furnace for pre-burning. The pre-firing temperature is 800°C, the pre-firing time is 3 hours, the atmosphere is air, and it is cooled with the furnace after pre-firing. After pre-burning, XRD phase analysis was carried out on the pre-fired material, and it was confirmed that only spinel structure existed in the pre-fired material without other impurity ...

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Abstract

The present invention discloses one kind of ferrite material with low temperature coefficient, low loss and high saturated flux density and its preparation process. It is mainly spinel type structure and consists of Fe2O3 45-52 mol%, ZnO 20-35 mol%, CuO 5-15 mol%, MnO 1-3 mol%, and NiO 10-18 mol%. The preparation process includes the following steps: mixing material; pre-sintering; adding impurity; secondary ball milling; forming and sintering. The ferrite material has CuO and Mn3O4 to replace NiO and thus lowered material cost, lower pre-sintering temperature and sintering temperature and thus low power consumption, low requirement in sintering apparatus and low production cost; relatively wide pre-sintering temperature range and sintering temperature range, no need of protecting atmosphere, high technological repeatability and product consistency.

Description

technical field [0001] The invention relates to a ferrite material with low temperature coefficient, low loss and high saturation magnetic flux density and a preparation method thereof. Background technique [0002] NiZn-based ferrite materials with high saturation magnetic flux density and initial permeability greater than 800 are widely used in the field of automotive electronics, such as supply choke coils for power supplies, linearity coils, DC -Main raw materials for DC-DC converter coils, transformer coils, misconvergence correction coils and some surface mount components. Therefore, this material has a huge market prospect. [0003] In order to make the device work better, especially under different climatic conditions, it is required that the main raw material of the device, the NiZn ferrite material, not only has a high saturation magnetic flux density, but also has a wide It has a low temperature coefficient and low loss in the temperature range. [0004] At pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/30C04B35/443C04B35/622H01F1/34
Inventor 严密彭晓领罗伟张文勇
Owner ZHEJIANG UNIV
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