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Sintering method of high-magnetic-permeability MnZn ferrite material

A technology of ferrite material and high magnetic permeability, which is applied in the field of sintering of high magnetic permeability MnZn ferrite materials, can solve problems such as sintering process research, achieve improved magnetic permeability, prolong service life, and reduce sintering costs Effect

Inactive Publication Date: 2014-01-22
苏州天源磁业股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese patent applications CN200710071536.2, CN200810037005.6, CN200810123262.1, CN200910133726.1, CN200910194706.5, CN201010150330.0, etc. mainly improve the magnetic permeability of MnZn ferrite by selecting the main formula composition, additive design and combination, but The sintering process was not studied in detail, but the inventors found that the control of the sintering process is very important to improve the magnetic permeability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] will consist of 52mol% Fe 2 o 3 , 23mol% ZnO, 25mol% 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: 0.01wt% CaCO 3 , 0.04wt% Bi 2 o 3 , 0.04wt% MoO 3 . 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, the first heating stage is from room temperature to 700°C, the heating rate is 0.8°C / min, and the heating is carried out in the atmosphere; the second heating stage is from 700°C to 1370°C, the heating rate is 5°C / min, and the partial pressure of oxygen in the heating stage is maintained at 0.7%; at 1370°C for 8 hours, the partial pressure of oxygen is maintained at 100%; finally from 1370°C to room temperature, the cooling rate is...

Embodiment 2

[0027] will consist of 52.5mol% Fe 2 o 3 , 23.5mol% ZnO, 24mol% MnO raw materials were mixed in a sand mill for 1 hour, and then pre-fired at 750 °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: 0.02wt% CaCO 3 , 0.03wt% Bi 2 o 3 , 0.03wt% MoO 3 . 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, the first heating stage is from room temperature to 700°C, the heating rate is 0.8°C / min, and the heating is carried out in the atmosphere; the second heating stage is from 700°C to 1360°C, the heating rate is 6°C / min, and the partial pressure of oxygen in the heating stage is maintained at 0.5%; at 1360°C for 10 hours, the partial pressure of oxygen is maintained at 21%; finally from 1360°C to room temperature, the cooling rat...

Embodiment 3

[0033] will consist of 52.2mol% Fe 2 o 3 , 23.8mol% ZnO, 24mol% MnO raw materials were mixed in a sand mill for 1 hour, and then pre-fired at 800 °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: 0.01wt% CaCO 3 , 0.05wt% Bi 2 o 3 , 0.05wt% MoO 3 . . 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, the first heating stage is from room temperature to 700°C, the heating rate is 0.8°C / min, and the heating is carried out in the atmosphere; the second heating stage is from 700°C to 1360°C, the heating rate is 6°C / min, and the partial pressure of oxygen in the heating stage is maintained at 0.5%; at 1360°C for 10 hours, the partial pressure of oxygen is maintained at 21%; finally from 1360°C to room temperature, the cooling ...

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Abstract

The invention discloses a sintering method of a high-magnetic-permeability MnZn ferrite material, which comprises the following four stages: a. first temperature rise stage; b. second temperature rise stage; c. holding stage; and d. cooling stage. Since the temperature and partial oxygen pressure are controlled in the whole sintering process of temperature rise, holding and cooling, the high-magnetic-permeability MnZn ferrite can be obtained at lower sintering temperature. The sintering method of the high-magnetic-permeability MnZn ferrite has the advantages of low sintering temperature and short sintering period, and greatly lowers the sintering cost of the MnZn ferrite.

Description

[0001] technical field [0002] The invention relates to a sintering method of MnZn ferrite material, in particular to a sintering method of high magnetic permeability MnZn ferrite material. Background technique [0003] 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 high magnetic permeability MnZn ferrite materials. With the miniaturization of electronic components, it is hoped that the higher the permeability of the high permeability MnZn ferrite, the better. The preparation of high magnetic permeability MnZn ferrite, in addition to selecting a suitable main formula design and suitable trace additives, the control of the sintering process is also very important. [0004] Chinese patent applications CN200710071536.2, CN200810037005.6, CN200810123262.1, CN2...

Claims

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Application Information

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IPC IPC(8): C04B35/26
Inventor 高庞李思秋张建明王育伟张维
Owner 苏州天源磁业股份有限公司
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