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High frequency low loss ferrite and preparation method

A ferrite, low-loss technology, applied in the field of high-frequency low-loss ferrite and its preparation, to achieve the effects of low heat generation, stable production process and low loss

Inactive Publication Date: 2014-06-04
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the operating frequency of the low-loss magnetic core achieved in the above literature is only around 500kHz

Method used

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  • High frequency low loss ferrite and preparation method
  • High frequency low loss ferrite and preparation method
  • High frequency low loss ferrite and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Fe was weighed according to the main component content shown in Table 1 2 o 3 , MnO, and ZnO raw materials are wet-mixed, fully mixed and pre-fired at 750°C for 2 hours. Add 150ppm of SiO to the pre-fired mixture based on the weight of the main component 2 , 1200ppm of CaCO 3 , 500ppm of Sb 2 o 3 and 300ppm Nb 2 o 5 , wet sanding to obtain a ferrite slurry. Add 1wt% PVA binder calculated by ferrite powder weight to the slurry for spray granulation. at 1 ton / cm 2 The granulated powder is molded into a standard ring ferrite core for testing under high pressure. The molded body was sintered at 1150°C for 5 hours under the condition of controlled oxygen partial pressure, wherein the oxygen partial pressure concentration in the heating stage of 900°C to 1150°C was 0.001%, and then cooled to room temperature under the protection of nitrogen. The final composition of the ferrite core was detected to be consistent with the design composition by an X-ray fluorescence a...

Embodiment 2

[0030] The preparation process of the magnetic core is the same as that of Embodiment 1. Fe in the main ingredient formula 2 o 3 , MnO, ZnO content fixed at 55.5mol% Fe 2 o 3 , 43.5 mol% of MnO and 1.0 mol% of ZnO. The addition amount of auxiliary component is as shown in table 2.

[0031] Table 2

[0032]

[0033] It can be seen from Table 2 that when the content of the secondary components is within the scope of the present invention, the high-frequency volume loss of the magnetic core is low. When the content of the subcomponent deviates from the range of the present invention, the loss tends to increase.

Embodiment 3

[0035] The composition of the magnetic core is the same as that of Test No. 103 in Example 1, and the preparation process is the same as that of Example 1. Only the oxygen partial pressure concentration in the temperature rising section from 900°C to 1150°C is shown in Table 3.

[0036]table 3

[0037]

[0038] It can be seen from Table 3 that when the oxygen partial pressure concentration is higher than 0.5%, the high frequency loss of the magnetic core increases.

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Abstract

The invention discloses high frequency low loss ferrite which comprises a main component and an auxiliary component, and is characterized in that the main component comprises, on a basis of oxide content, 54-57 mol% of Fe2O3, 0-5 mol% of ZnO, and the balance of MnO, and the auxiliary component comprises, on a basis of the total weight of the main component, 50-300 ppm of SiO2, 500-2000 ppm of CaCO3, 100-1000 ppm of Sb2O3, and 100-600 ppm of Nb2O5. The manganese zinc ferrite of the invention can normally work at a frequency of 2 MHz or more, is low in loss, less in heating, and high in efficiency; the production process of the ferrite is stable and low in cost; the prepared product can increase energy transmission density of electronic devices, and realize miniaturization, lightening and thinning of electronic devices.

Description

technical field [0001] The invention belongs to the technical field of soft magnetic ferrite materials, and in particular relates to a high-frequency low-loss ferrite and a preparation method thereof. Background technique [0002] Soft magnetic ferrite is a material with high magnetic permeability, high resistivity and low loss characteristics, so it has been widely used in transformers, inductors, switching power supplies, communication equipment, computer electronic rectifiers and other fields; MnZn ferrite is widely used in the fields of electronics and communication as energy storage and conversion materials. The miniaturization, high speed, and high output power of electronic devices require that MnZn ferrite devices can still work normally at high frequencies. This requires the ferrite core to have low loss, low heat generation and high efficiency at high frequencies. [0003] In order to reduce the loss of MnZn ferrite, researchers have carried out a lot of research...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/36C04B35/38C04B35/622
Inventor 颜冲葛洪良雷国莉
Owner CHINA JILIANG UNIV