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High-temperature low-loss MnZn power ferrite and preparation method thereof

A low-loss, ferrite technology, applied in the field of MnZn power ferrite materials, can solve problems such as adverse effects on electromagnetic properties, abnormal grain growth, and inconsistent thinking

Active Publication Date: 2012-09-26
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Another example is the patent application number CN201110008633.3, except for CaCO 3 and SiO 2 In addition to the joint addition of , it is also required to join Y 2 o 3 , which is not only inconsistent with the thinking of the present invention, but also easily causes the growth of abnormal crystal grains, which adversely affects the electromagnetic properties

Method used

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  • High-temperature low-loss MnZn power ferrite and preparation method thereof
  • High-temperature low-loss MnZn power ferrite and preparation method thereof
  • High-temperature low-loss MnZn power ferrite and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Weigh the main component raw materials according to the following main component content: Fe 2 o 3 The content of ZnO is 53mol%, the content of ZnO is 8mol%, and the content of MnO is 39mol%. The three are mixed and crushed; the crushed powder is pre-calcined at a temperature of 900°C for 2 hours; Ingredients (Auxiliary ingredient content by total weight of main ingredient is: CaCO 3 :0.05wt%, ZrO 2 :0.02wt%, Nb 2 o 5 :0.02wt% and Co 2 o 3 : 0.09wt%), carry out secondary sand grinding, the ratio of material ball water is 1:6:1.2 in the second sand grinding, the sand grinding time is 2 hours, and the particle size of sand abrasive is 1.15??m. Put it into the stirring tank, add 8wt% PVA and 1wt% n-octanol defoamer in terms of sand abrasives, after fully stirring, carry out spray granulation, and then press under 5MPa pressure to make the density 3.1g / cm 3 The left and right standard rings are finally sintered in a bell furnace. The sintering temperature is contr...

Embodiment 2

[0048] Weigh the main component raw materials according to the following main component content: Fe 2 o 3 content of 53.3mol%, ZnO content of 8mol%, and MnO content of 38.7mol%. The three are mixed and crushed; the crushed powder is pre-calcined at 900°C for 2 hours; Add auxiliary component raw materials (the content of auxiliary components by the total weight of the main component is: CaCO 3 :0.05wt%, ZrO 2 :0.02wt%, Nb 2 o 5 :0.02wt% and Co 2 o 3 : 0.09wt%), carry out secondary sand grinding, the ratio of material ball water is 1:6:1.2 during the second sand grinding, the sand grinding time is 2 hours, and the particle size of sand abrasive is 1.15??m. Put it into the mixing tank, add 8wt% PVA and 1wt% n-octanol defoamer based on sand abrasives, stir well, spray granulate, and then press under 5MPa pressure to make the density 3.1g / cm2 3 The left and right standard rings are finally sintered in a bell furnace. The sintering temperature is controlled at 1320°C, the si...

Embodiment 3

[0054]Weigh the main component raw materials according to the following main component content: Fe 2 o 3 The content of ZnO is 53.4mol%, the content of ZnO is 8mol%, and the content of MnO is 38.6mol%. The three are mixed and crushed; the crushed powder is pre-calcined at 900°C for 2 hours; Add the auxiliary component raw material weighed in proportion (the content of the auxiliary component by the total weight of the main component is: CaCO 3 :0.05wt%, ZrO 2 :0.02wt%, Nb 2 o 5 :0.02wt% and Co 2 o 3 : 0.1wt%), carry out secondary sand grinding, the ratio of material ball water in the second sand grinding is 1:6:1.2, the sand grinding time is 2 hours, and the particle size of sand abrasive is 1.15??m. Put it into the mixing tank, add 8wt% PVA and 1wt% n-octanol defoamer based on sand abrasives, stir well, spray granulate, and then press under 5MPa pressure to make the density 3.1g / cm2 3 The left and right standard rings are finally sintered in a bell furnace. The sinter...

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Abstract

The invention belongs to the field of MnZn power ferrite materials, and particularly relates to a high-temperature low-loss MnZn power ferrite which comprises major components and minor components, wherein on the basis of oxides, the major components comprise 53-53.5 mol% of Fe2O3, 8-9 mol% of ZnO and the balance of MnO; and on the basis of the total weight of the major component raw materials, the minor components comprise CaCO3, ZrO2, Nb2O5 and Co2O3. The invention also provides a preparation method of the high-temperature low-loss MnZn power ferrite. The material provided by the invention has wide applicable temperature range, and can operate at 90-120 DEG C; and the material provided by the invention can be widely used in the fields of switching supply transformers, LCD (liquid crystal display) illumination and other electronic components, and is suitable for operation at 100 DEG C or above for a long time.

Description

technical field [0001] The invention belongs to the field of MnZn power ferrite materials, and in particular relates to a high-temperature and low-loss MnZn power ferrite capable of realizing low-loss characteristics under high-temperature conditions and a preparation method thereof. Background technique [0002] MnZn power ferrite is an important part of electronic components. At present, mainstream switching power supply transformers all work at about 100°C. The power consumption valley of existing MnZn power ferrite is at 100°C, and the material loss at 120°C bigger. Failure to take into account the loss of 90°C-120°C will easily cause burn-in. Although the Japanese TDK company announced the PC95 material to lower the loss at 25°C-100°C, the application of this material is mainly to reduce the standby loss, and it is not suitable for long-term work at 100°C or higher temperature. [0003] The present invention is suitable for working in the temperature range of 90°C-120...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 吕东华颜冲徐艳
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD