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Mn-Zn ferrite with high saturation flux density and high magnetic conductivity and preparation process thereof

A technology of magnetic induction intensity and high magnetic permeability, which is applied in the field of ferrite, can solve the problems that ferrite cannot meet, and achieve the effect of high magnetic permeability

Active Publication Date: 2014-02-19
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] An invention patent with application number 200310114712.8 discloses a Mn-Zn ferrite containing iron oxide as Fe 2 o 3 Converted to 51-54 mol%, zinc oxide converted to ZnO is 14-21 mol%, and the rest is the main component of manganese oxide. The ferrite disclosed in this patent cannot meet the current high Bs requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Mixing: Weigh the main components and auxiliary components according to the proportion of raw materials:

[0030] The main component and content are: Fe 2 o 3: 53mol%, ZnO: 21mol%, MnO: 26mol%; the auxiliary components and their content are based on the total weight of the main components: CaO: 100ppm, Bi 2 o 3 : 600ppm, SnO 2 : 200ppm, MoO 3 : 400ppm, In 2 o 3 : 400ppm, SiO 2 : 100ppm;

[0031] Use a V-shaped mixer for dry strong mixing, and the mixing time is 0.5 hours;

[0032] (2) Vibration grinding: The raw materials mixed in step (1) are vibrated and ground with a vibrating mill, and the vibration grinding time is 0.5 hours;

[0033] (3) Pre-burning: Use an air kiln to directly pre-fire the powder obtained by vibration grinding at a temperature of 900°C for 3 hours;

[0034] (4) Ball milling: use a ball mill to mill the calcined product, and the ball milling time is 2 hours; where material: ball: water = 1: 0.8: 0.55; the average particle size of the...

Embodiment 2

[0041] (1) Mixing: Weigh the raw materials of main components and auxiliary components in proportion,

[0042] The main component and content are: Fe 2 o 3 : 52mol%, ZnO: 18mol%, MnO: 30mol%; the auxiliary components and their content are based on the total weight of the main components: CaO: 400ppm, Bi 2 o 3 : 300ppm, SnO 2 : 400ppm, MoO 3 : 200ppm, In 2 o 3 : 800ppm, SiO 2 : 50ppm, La 2 o 3 200ppm;

[0043] Dry strong mixing with a V-shaped mixer, and the mixing time is 1 hour;

[0044] (2) Vibration grinding: Vibrate the raw materials mixed in step (1) with a vibrating mill for 0.8 hours;

[0045] (3) Pre-burning: Use an air kiln to directly pre-fire the powder obtained by vibrating grinding, the pre-burning temperature is 1000 ° C, and the time is 5 hours;

[0046] (4) Ball milling: use a ball mill to mill the calcined product, the ball milling time is 4 hours, and the volume ratio of material: ball: water is 1:0.8:0.65; the average particle size of the powder ...

Embodiment 3

[0053] (1) Mixing: Weigh the raw materials of main components and auxiliary components in proportion,

[0054] The main component and content are: Fe 2 o 3 : 54mol%, ZnO: 19mol%, MnO: 27mol%; the auxiliary components and their content are based on the total weight of the main components: CaO: 300ppm, Bi 2 o 3 : 100ppm, SnO 2 : 100ppm, MoO 3 : 800ppm, In 2 o 3 : 200ppm, SiO 2 : 200ppm, Gd 2 o 3 50ppm;

[0055] Use a V-type mixer for dry strong mixing, and the mixing time is 0.7 hours;

[0056] (2) Vibration grinding: Vibrate and grind the raw materials mixed in step (1) with a vibrating mill for 0.4 hours;

[0057] (3) Pre-burning: use an air kiln to directly pre-fire the powder obtained by vibrating grinding, the pre-burning temperature is 1100 ° C, and the time is 1 hour;

[0058] (4) Ball milling: use a ball mill to mill the calcined product, the ball milling time is 0.5 hours, and the volume ratio of material: ball: water is 1:1.2:0.65; the average particle size...

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Abstract

The invention relates to ferrite and particularly relates to Mn-Zn ferrite with high saturation flux density and high magnetic conductivity and a preparation process thereof. The ferrite consists of main components and auxiliary components, wherein the main components include 52-54mol% of iron oxide calculated by Fe2O3, 18-21mol% of zinc oxide calculated by ZnO and the balance of manganese oxide calculated by MnO; relative to the main components, the auxiliary components include 100-500ppm of Ca calculated by CaO, 300-1000ppm of Bi calculated by Bi2O3, 100-400ppm of Sn calculated by SnO2 and 200-800ppm of Mo calculated by MoO3. The final ferrite product is finally obtained by the steps of mixing, vibrative grinding, presintering, ball milling, pelleting forming and sintering. According to the ferrite product, the saturation flux density Bs is improved to above 470mT on the basis that the 12000+ / -30% of magnetic conductivity is ensured.

Description

technical field [0001] The invention relates to a ferrite, in particular to a Mn-Zn ferrite with high saturation magnetic induction and high permeability characteristics and a preparation process thereof. Background technique [0002] At present, industries such as digital technology and optical fiber communication require a large amount of soft magnetic ferrite with high magnetic permeability for the application of inductors, filters, choke coils, broadband and pulse transformers. Soft ferrite is based on Fe 2 o 3 Ferrimagnetic oxide as the main component is produced by powder metallurgy. There are several types such as Mn-Zn, Cu-Zn, Ni-Zn, etc. Among them, the output and consumption of Mn-Zn ferrite are the largest, and the resistivity of Mn-Zn ferrite is low, which is 1-10 ohm / meter, generally in Use at frequencies below 100kHZ. The resistivity of Cu-Zn and Ni-Zn ferrite is 102-104 ohm / meter, and the loss in the radio frequency band of 100kHz-10 MHz is small, and it i...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
Inventor 金鑫
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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