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Wide temperature rang, low temperature coefficient, high magnetic permeability NiZn ferrite material and its preparing method

A technology of ferrite material and low temperature coefficient, which is applied in the field of NiZn ferrite material and its preparation, can solve the problems of reducing pre-sintering and sintering temperature, large energy consumption, and increasing steel ball loss, etc., to achieve lower sintering temperature, Effect of low temperature coefficient and cost reduction

Active Publication Date: 2006-11-08
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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Problems solved by technology

[0006] The present invention is also aimed at the high sintering temperature and high energy consumption for manufacturing NiZn ferrite materials, which is not conducive to environmental protection and causes the grains of ferrite to grow abnormally, and the grains become uneven, resulting in loss and deterioration of the temperature coefficient. The disadvantage is to provide a production process of NiZn ferrite that reduces the pre-sintering and sintering temperature by adjusting the composition formula and process parameters
[0007] The present invention also solves the problem that the hardness of the pre-sintered material increases due to the high sintering temperature in the prior art, which makes the pre-sintered material difficult to crush in the secondary crushing process, increases the loss of steel balls in the ball milling process, and is easy to carry The problem of entering a large amount of impurities

Method used

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  • Wide temperature rang, low temperature coefficient, high magnetic permeability NiZn ferrite material and its preparing method

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Effect test

Embodiment 1

[0036] 1. the selection of raw material: the raw material of the Ni-Zn ferrite material of the low-temperature sintering provided by the invention selects industrial pure Fe 2 o 3 , ZnO, NiO and CuO.

[0037] 2. Composition design and weighing: Weigh 49mol% Fe according to molar percentage 2 o 3 , 31 mol% ZnO, 9 mol% NiO and 11 mol% CuO.

[0038] 3. Mixing of raw materials: Put the weighed raw materials into a ball mill, add an equal weight of deionized water, and ball mill for 7 hours, so that the average particle size of the raw materials is 1.0 μm.

[0039] 4. Pre-burning: Dry the mixed and ground raw materials and put them into the furnace for pre-burning. The pre-firing temperature is 750°C, the pre-firing time is 4 hours, the atmosphere is air, and it is cooled with the furnace after pre-firing.

[0040] 5. Secondary ball milling: add the auxiliary component Cr into the calcined material 2 o 3 0.2 wt%, MoO 3 0.05% by weight of equal weight of deionized water was ...

Embodiment 2

[0044] 1. the selection of raw material: the raw material of the Ni-Zn ferrite material of the low-temperature sintering provided by the invention selects industrial pure Fe 2 o 3 , ZnO, NiO and CuO.

[0045] 2. Composition design and weighing: Weigh 49mol% Fe according to molar percentage 2 o 3 , 30mol% ZnO, 11mol% NiO and 10mol% CuO.

[0046] 3. Mixing of raw materials: Put the weighed raw materials into a ball mill, add an equal weight of deionized water, and ball mill for 6 hours, so that the average particle size of the raw materials is 1.2 μm.

[0047] 4. Pre-burning: Dry the mixed and ground raw materials and put them into the furnace for pre-burning. The pre-firing temperature is 790°C, the pre-firing time is 2 hours, the atmosphere is air, and it is cooled with the furnace after pre-firing.

[0048] 5. Secondary ball milling: add the auxiliary component Cr into the calcined material 2 o 3 0.1wt%, MoO 3 0.03wt%, WO 3 0.04wt% deionized water of equal weight was...

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Abstract

The present invention relates to akind of low temperature sintered NiZn ferrite. The low temperature sintered NiZn ferrite has Fe2O3 40-50 mol%, NiO 5-10 mol%, ZnO 25-40 mol% and CuO 5-15 mol% as main components and one or several of Cr2O3, MoO3, WO3, SnO2 and V2O5 as supplementary material. The present invention has low sintering temperature and low power consumption, and the material has the features of high magnetic permeability, low specific loss and low temperature coefficient in wide temperature range, etc.

Description

technical field [0001] The invention relates to a NiZn ferrite material with a low temperature coefficient and an initial magnetic permeability of more than 1500 in the temperature range of -40°C to 85°C and a preparation method thereof. Background technique [0002] An important application of high permeability NiZn material is to prepare radio frequency broadband devices. The application of radio frequency broadband devices in television, communication, radar, instrumentation and automatic control is very common. Especially in recent years, with the continuous popularization of digital TV network and gradually replacing the existing cable TV network, a large number of new radio frequency broadband components are required in the process of network transformation. This provides a large market for RF broadband components. An important development direction of RF broadband devices is to have a wider operating frequency and be able to adapt to different working environments, ...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
Inventor 何时金包大新张涛葛蕴刚
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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