Low-loss MnZn ferrite material sintering method

A technology of ferrite material and sintering method, which is applied in the field of sintering of MnZn ferrite materials, can solve the problems of no sintering process research, etc., and achieve the effects of low sintering cost, long service life of kiln, and reduced loss

Active Publication Date: 2014-01-01
苏州天源磁业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Chinese patent applications CN02137639.5, CN200510033612.1, CN200610022471.8, CN200910133729.5, CN201110260074.5, CN201110385076.7 mainly reduce the loss of MnZn ferrite by selecting the main formula composition, additive design and combination, but there is no The sintering process is studied in detail

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] will consist of 52.6mol% Fe 2 o 3 , 12mol% ZnO, 35.4mol% MnO raw materials were mixed in a sand mill for 1 hour, and then pre-fired at 850 °C for 2 hours. Based on the mass of the pre-fired powder, add auxiliary components to the above-mentioned pre-fired material. The added auxiliary components (wt%) are: 0.1wt% CaCO 3 , 0.04wt% Nb 2 o 5 , 0.03wt% V 2 o 5 . Then carry out secondary sand grinding for 2 hours, spray granulation after adding PVA, and shape it into a standard annular magnetic core of Φ25 for sintering. In the sintering process, in the first heating stage, the stage is raised from room temperature to 700°C at a heating rate of 2°C / min, and the heating is carried out in the atmosphere; then from 700°C to 1200°C at a heating rate of 1.0 °C / min, the partial pressure of oxygen in this heating stage is maintained at 0.5%; in the second heating stage, this stage is raised from 1200°C to 1300°C, the heating rate is 5°C / min, and the partial pressure of oxyge...

Embodiment 2

[0026] will consist of 52.8mol% Fe 2 o 3 , 11mol% ZnO, 36.2mol% MnO raw materials were mixed in a sand mill for 1 hour, and then pre-fired at 900 °C for 2 hours. Based on the mass of the pre-fired powder, add auxiliary components to the above-mentioned pre-fired material. The added auxiliary components (wt%) are: 0.12wt% CaCO 3 , 0.02wt% V 2 o 5 , 0.04wt% ZrO 2 . Then carry out secondary sand grinding for 2 hours, spray granulation after adding PVA, and shape it into a standard annular magnetic core of Φ25 for sintering. In the sintering process, in the first heating stage, the stage is raised from room temperature to 700°C at a heating rate of 2°C / min, and the heating is carried out in the atmosphere; then from 700°C to 1200°C at a heating rate of 1.0 °C / min, the partial pressure of oxygen in this heating stage is maintained at 0.5%; in the second heating stage, this stage is raised from 1200°C to 1300°C, the heating rate is 5°C / min, and the partial pressure of oxygen i...

Embodiment 3

[0032] will consist of 53mol% Fe 2 o 3 , 10mol% ZnO, 37mol% MnO raw materials were mixed in a sand mill for 1 hour, and then pre-fired at 950 °C for 2 hours. Based on the mass of the pre-fired powder, add auxiliary components to the above-mentioned pre-fired material. The added auxiliary components (wt%) are: 0.08wt% CaCO 3 , 0.02wt% Nb 2 o 5 , 0.02wt% ZrO 2 . Then carry out secondary sand grinding for 2 hours, spray granulation after adding PVA, and shape it into a standard annular magnetic core of Φ25 for sintering. In the sintering process, in the first heating stage, the stage is raised from room temperature to 700°C at a heating rate of 2°C / min, and the heating is carried out in the atmosphere; then from 700°C to 1200°C at a heating rate of 1.0 °C / min, the oxygen partial pressure in this heating stage is maintained at 0.5%; in the second heating stage, this stage is raised from 1200°C to 1310°C, the heating rate is 5°C / min, and the oxygen partial pressure in the hea...

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Abstract

The invention discloses a low-loss MnZn ferrite material sintering method. The method includes four temperature change stages which mainly induce: a, the first temperature rising stage, b, the second temperature rising stage, c, the temperature maintaining stage and d, the temperature falling stage. According to the method, due to the fact that temperature and oxygen partial pressure are controlled in the whole sintering process of temperature rising, temperature maintaining and temperature falling, loss of MnZn power ferrite can be reduced. The method has the advantages of being low in sintering temperature and low in loss when applied to preparing the MnZn ferrite, and the efficiency of MnZn ferrite elements is greatly improved.

Description

technical field [0001] The invention relates to a sintering method of MnZn ferrite material, in particular to a sintering method of low-loss MnZn ferrite material. Background technique [0002] With the popularity of portable mobile electronic devices, the rapid development of multimedia communications and digital networks, and the needs of electromagnetic compatibility and anti-electromagnetic interference, higher and newer requirements are put forward for power MnZn ferrite materials. With the energy saving of electronic components, it is hoped that the loss of power MnZn ferrite should be as low as possible. For the preparation of low-loss MnZn ferrite, in addition to choosing a suitable main formula design and suitable trace additives, the control of the sintering process is also very important. [0003] Chinese patent applications CN02137639.5, CN200510033612.1, CN200610022471.8, CN200910133729.5, CN201110260074.5, CN201110385076.7 mainly reduce the loss of MnZn ferrit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/64C04B35/26
Inventor 李思秋高庞张建明王育伟张维
Owner 苏州天源磁业股份有限公司
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