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NiMnZn ferrite material and preparation method thereof

A ferrite material and raw material technology, applied in the direction of inorganic material magnetism, can solve the problem of loss reduction, achieve the effect of reducing volume, realizing light and thin, and realizing energy saving

Active Publication Date: 2011-05-11
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there is nothing about adding Na in the additive 2 Any content of O, and its loss needs to be further reduced

Method used

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  • NiMnZn ferrite material and preparation method thereof
  • NiMnZn ferrite material and preparation method thereof
  • NiMnZn ferrite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]Take by weighing Fe with the main component raw material formula shown in Table 1 2 o 3 , MnO, ZnO, and NiO raw materials were wet mixed, and then pre-fired at 900 ° C for 2 hours. Based on the total weight of the main component raw materials, add 150ppm of SiO to the pre-fired mixture 2 , 900ppm of CaCO 3 , 200ppm ZrO 2 , 200ppm Nb 2 o 5 and 100ppm Na 2 O, where Na 2 O was added in the form of NaCl, and wet sanding treatment was performed to obtain ferrite slurry. Add 1wt% PVA binder calculated by ferrite powder weight to the slurry for spray granulation. at 1 ton / cm 2 Under high pressure, the granulated powder is molded into a standard ring ferrite core for testing. Then the molded body was sintered at 1300°C for 5 hours under the condition of controlled oxygen partial pressure, wherein the heating rate was 4°C / min during the heating stage from 1000°C to 1300°C, and the oxygen partial pressure concentration was 0.1%. Then in balance O 2 -N 2 cooling in an ...

Embodiment 2

[0039] The preparation process of the magnetic core is the same as that of Example 1. The difference is that the formula of the main component raw material is fixed at 53.6mol% Fe 2 o 3 , the MnO of 38.2mol%, the ZnO of 7mol% and the NiO of 1.2mol%; 2 O to Na 2 CO 3 form to join.

[0040] Table 2

[0041]

[0042] As can be seen from Table 2, when the add-on of secondary component raw materials is within the scope of the present invention, the volume power consumption of the magnetic core is low; when the add-on of secondary component raw materials deviates from the scope of the present invention, the volume power consumption of the magnetic core has a tendency to deteriorate.

Embodiment 3

[0044] The composition of the magnetic core is the same as the test number 103#. The preparation process is the same as that of Example 1, except that the heating rate and oxygen partial pressure concentration in the heating section of 1000° C. to 1330° C. are shown in Table 3.

[0045] table 3

[0046]

[0047] It can be seen from Table 3 that when the heating rate is lower than 4°C / min, the high-temperature saturation magnetic flux density of the magnetic core decreases; when the heating rate is higher than 7°C / min, the high-temperature saturation magnetic flux density of the magnetic core decreases and the power consumption increases. High; when the oxygen partial pressure concentration is higher than 0.2%, the high temperature saturation magnetic flux density of the magnetic core decreases.

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Abstract

The invention belongs to the field of soft magnetic materials and in particular discloses a NiMnZn ferrite material which consists of main components and auxiliary components. The NiMnZn ferrite material is characterized in that the main components comprise 53.2-55.7 mol percent of Fe2O3, 2-11 mol percent of ZnO2, 0-2.5 mol percent of NiO (exclusive of 0) and the balance of MnO; and the auxiliary components comprise the following components in terms of the total weight of the raw materials of the main components: 50-200ppm of SiO2, 200-1,500ppm of CaCO3, 250-500ppm of ZrO, 50-500ppm of Nb2O5 and 50-300ppm of Na2O. The invention also provides a preparation method of the NiMnZn ferrite material, wherein in a sintering process, the heating rate in a heating stage of 1,000-1,300 DEG C is 4-7 DEG C / minute, and oxygen partial pressure concentration is below 0.2 percent, the holding temperature is 1,300-1,350 DEG C, and the sintering time is 2-8 hours. The saturation magnetic flux density of a ferrite magnetic core provided by the invention is above 450mT, and the loss below 100 DEG C is below 320KW / m<3>.

Description

technical field [0001] The invention belongs to the field of soft magnetic ferrite materials, in particular to a NiMnZn ferrite material with high temperature, high saturation magnetic flux density and low loss characteristics and a preparation method thereof. Background technique [0002] MnZn ferrite is widely used in electronics and communication fields as power transformer materials. The operating temperature of a traditional switching power supply transformer is generally 60-100°C, and the operating frequency is 10-100kHz. In order to reduce the core loss of ferrite devices in the transformer operating temperature range, various studies have been carried out so far, such as the addition of additives, element substitution, and optimization of process conditions, to reduce the loss of ferrite cores in the transformer operating temperature range, such as Publication numbers are reports of Chinese inventions such as CN1402266A, CN1492453A, CN1896032A, CN1286237A, etc. Wit...

Claims

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Application Information

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IPC IPC(8): H01F1/36C04B35/64
Inventor 颜冲吕东华雷国莉
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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