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Low-loss MnZn ferrite material sintering method

A technology of ferrite material and sintering method, which is applied in the direction of inorganic material magnetism, 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: 2014-12-31
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 , 12 mol % ZnO, 35.4 mol % MnO consisting of 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 powder after pre-sintering, auxiliary components are added to the above-mentioned pre-sintered materials. 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, add PVA, spray granulation, and shape into a standard annular magnetic core of Φ25 for sintering. During the sintering process, in the first heating stage, this stage is first raised from room temperature to 700 °C, the heating rate is 2 °C / min, and the heating is carried out in the atmosphere; then from 700 °C to 1200 °C, the heating rate is 1.0 ℃ / min, the oxygen partial pressure in this heating stage is maintained at 0.5%; in the second heating stage, this stage is increased from 1200 °C to 1300 °C, the heating rate is...

Embodiment 2

[0026] will consist of 52.8mol% Fe 2 O 3 , 11 mol% of ZnO, and 36.2 mol% of MnO as 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 powder after pre-sintering, auxiliary components are added to the above-mentioned pre-sintered materials. 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, add PVA, spray granulation, and shape into a standard annular magnetic core of Φ25 for sintering. In the sintering process, in the first heating stage, the temperature is raised from room temperature to 700 °C, the heating rate is 2 °C / min, and the heating is carried out in the atmosphere; then it is raised from 700 °C to 1200 °C, and the heating rate is 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 increased from 1200 °C to 1300 °C, the heating ...

Embodiment 3

[0032] will consist of 53mol% Fe 2 O 3 , 10 mol % ZnO, 37 mol % MnO consisting of 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-sintered powder, auxiliary components are added to the above-mentioned pre-sintered materials, and 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, add PVA, spray granulation, and shape into a standard annular magnetic core of Φ25 for sintering. In the sintering process, in the first heating stage, the temperature is raised from room temperature to 700 °C, the heating rate is 2 °C / min, and the heating is carried out in the atmosphere; then it is raised from 700 °C to 1200 °C, and the heating rate is 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 increased from 1200 °C to 1310 °C, the heating rat...

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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 for MnZn ferrite materials, in particular to a sintering method for low-loss MnZn ferrite materials. Background technique [0002] With the popularization of portable mobile electronic devices, the rapid development of multimedia communications and digital networks, as well as the needs of electromagnetic compatibility and anti-electromagnetic interference fields, higher and updated requirements are currently placed on power MnZn ferrite materials. With the energy saving of electronic components, it is desired that the loss of power MnZn ferrite be as low as possible. In the preparation of low-loss MnZn ferrite, in addition to selecting the appropriate main formula design and appropriate 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, etc. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/34C04B35/64C04B35/26
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