A kind of low-temperature rapid sintering soft ferrite and its preparation method

A soft ferrite and rapid sintering technology, which is applied in the manufacture of inductors/transformers/magnets, the magnetism of inorganic materials, circuits, etc., can solve the problems of long holding time, high sintering temperature, and increased production costs, and achieve regular grains crystallization, good grain uniformity, and the effect of saving production costs

Active Publication Date: 2020-09-25
ZHONGDE ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the production process of manganese zinc ferrite, the sintering temperature is high, generally above 1300°C, even above 1500°C, and the holding time is longer, which increases the production cost, especially in the contemporary energy shortage. The preparation process ensures the electromagnetic properties of MnZn ferrite at the same time, which has become the development trend and demand of MnZn ferrite

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A low-temperature rapid sintering soft ferrite is prepared by the following steps:

[0026] S1. Weigh 60 parts of ferric oxide, 60 parts of zinc oxide, 30 parts of copper oxide, and 20 parts of manganese carbonate in molar parts and mix ball milling until the average particle size is 5 μm to obtain a mixed powder;

[0027] S2. Pre-calcining the mixed powder at a temperature of 1000° C. to obtain a pre-calcined material;

[0028] S3, taking yttrium oxide, aluminum oxide and lithium carbonate as doping materials;

[0029] S4. Add the doping material weighed in S3 to the pre-calcined material and perform secondary ball milling. The secondary ball milling time is 6, dry, add polyvinyl alcohol for granulation to obtain granular material;

[0030] S5. Put the granular material in the air atmosphere, heat up to the sintering temperature, and carry out heat preservation and sintering to obtain the low-loss soft ferrite. The sintering temperature satisfies: T=1454 / [lg(X+2Y+Z)+t...

Embodiment 2

[0032] A low-temperature rapid sintering soft ferrite is prepared by the following steps:

[0033] S1. Weigh 80 parts of ferric oxide, 40 parts of zinc oxide, 50 parts of copper oxide, and 15 parts of manganese carbonate in molar parts and mix ball milling until the average particle size is 30 μm to obtain a mixed powder;

[0034] S2. Pre-burning the mixed powder, the pre-burning temperature is 900°C to obtain the pre-fired material, and the pre-burning time is 20 minutes;

[0035] S3, based on the main material, weigh 0.1wt% yttrium oxide, 0.5wt% aluminum oxide and 0.2wt% lithium carbonate as doping materials;

[0036] S4. Add the doping material weighed in S3 to the pre-calcined material for secondary ball milling. The second ball milling time is 8 hours, dry, add polyvinyl alcohol for granulation to obtain granular material, the total amount of pre-calcined material and doped material The weight ratio with polyvinyl alcohol is 10:2;

[0037] S5. Put the granular material ...

Embodiment 3

[0039] A low-temperature rapid sintering soft ferrite is prepared by the following steps:

[0040] S1. Weigh 65 parts of ferric oxide, 55 parts of zinc oxide, 35 parts of copper oxide, and 19 parts of manganese carbonate in molar parts and mix ball milling until the average particle size is 20 μm to obtain a mixed powder;

[0041] S2. Pre-burning the mixed powder, the pre-burning temperature is 950°C to obtain the pre-fired material, and the pre-burning time is 40 minutes;

[0042] S3, taking the main material as a benchmark, weighing 0.3wt% yttrium oxide, 0.2wt% aluminum oxide and 0.3wt% lithium carbonate as doping materials;

[0043] S4. Add the doping material weighed in S3 to the pre-calcined material for secondary ball milling. The second ball milling time is 8 hours, dry, add polyvinyl alcohol for granulation to obtain granular material, the total amount of pre-calcined material and doped material The weight ratio with polyvinyl alcohol is 10:3;

[0044]S5. Put the gra...

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PUM

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Abstract

The invention discloses low-temperature rapidly sintered soft magnetic ferrite and a preparation method thereof. The preparation method comprises the following steps: S1, weighing the following components in parts by mole: 60-80 parts of ferric oxide, 40-60 parts of zinc oxide, 30-50 parts of copper oxide and 15-20 parts of manganese carbonate, and performing mixing ball-milling till the average particle size is 5-30 [mu]m so as to obtain mixed powder; S2, pre-sintering the mixed powder at 900-1000 DEG C so as to obtain a pre-sintered material; S3, weighing yttrium oxide, aluminum oxide and lithium carbonate as doping materials; S4, adding the doping materials weighed in the step S3 into the pre-sintered material, performing secondary ball-milling for 6-8 hours, drying, adding polyvinyl alcohol, and performing pelletizing so as to obtain a granular material; S5, heating the granular material to sintering temperature in the presence of an air atmosphere, and performing warm-keeping sintering, thereby obtaining the low-temperature rapidly sintered soft magnetic ferrite, wherein the sintering temperature meets the equation that T=1454 / [1g(X+2Y+Z)+t]. Due to mutual cooperation of the main material and the doping materials, a preparation process is optimized, the sintering temperature is reduced, and meanwhile the electromagnetic properties of the ferrite are ensured.

Description

technical field [0001] The invention relates to the technical field of soft ferrite, in particular to a low-temperature rapid sintering soft ferrite and a preparation method thereof. Background technique [0002] Ferrite is generally used as a magnetic medium material in application. It is obtained by composite oxidation of iron and one or more other corresponding metal elements, so it was also called ferrite oxide in the early days. . Since the 1930s, Japan, Germany and other countries have carried out very systematic research and production of ferrite, and the development is very rapid. Now it has been realized in many fields such as radio, communication, radar navigation, space flight, and automatic control. very widely used. [0003] Soft magnetic manganese zinc ferrite has the characteristics of high magnetic permeability, high resistivity, low Curie temperature, low high-frequency loss and high saturation magnetic induction intensity, and is often used in various ele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/64C04B35/626H01F1/36H01F41/00
CPCC04B35/265C04B35/6261C04B35/64C04B2235/3203C04B2235/3217C04B2235/3225C04B2235/6562C04B2235/661C04B2235/77H01F1/36H01F41/00
Inventor 瞿德林王久如王晓祥李丛俊
Owner ZHONGDE ELECTRONICS
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