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Method for manufacturing low-loss manganese-zinc ferrite

A technology of manganese zinc ferrite and manufacturing method, which is applied in the field of magnetic materials and can solve the problems of large power loss and the like

Inactive Publication Date: 2015-01-28
WUXI SPINEL MAGNETICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the problem of large power loss of existing MnZn ferrite at extreme temperatures, especially at ultra-low temperatures, and provide a method for manufacturing low-loss MnZn ferrite

Method used

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  • Method for manufacturing low-loss manganese-zinc ferrite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The main ingredient is Fe 2 o 3 , Mn 3 o 4 And ZnO composition, according to 53mol% Fe 2 o 3 , 37mol% Mn 3 o 4 , and the balance is ZnO, and the main ingredients are weighed.

[0019] The above main materials and Co 3 o 4 (2000ppm) and Ni 2 o 3 (100ppm) into the sand mill for a sanding time of 30 minutes.

[0020] The material after primary sand grinding is dried by a spray dryer to obtain granules, and the granules are pre-fired in a rotary kiln by passing through at a temperature of 850°C.

[0021] The pre-fired particles are then subjected to secondary sand grinding, and at the same time, Ta 2 o 5 (500ppm), SiO 2 (100ppm), CaCO 3 (400ppm) and ZrO 2 (200ppm), the average particle size after sanding is controlled at about 0.7-0.9 microns.

[0022] Add 10wt% of the PVA solution with a concentration of 7-9wt% to the material after the second sanding, stir for 2 hours, spray granulate to make 40-160 mesh particles, and adjust the humidity of the particles...

Embodiment 2

[0027] The main ingredient is Fe 2 o 3 , Mn 3 o 4 And ZnO composition, according to 55mol% Fe 2 o 3 , 38mol% Mn 3 o 4 , and the balance is ZnO, and the main ingredients are weighed.

[0028] The above main materials and Co 3 o 4 (300ppm), SnO 2 (1000ppm) and Ni 2 o 3 (1200ppm) into the sand mill for a sanding time of 30 minutes.

[0029] The material after primary sand grinding is dried by a spray dryer to obtain granules, and the granules are pre-fired in a rotary kiln by passing through at a temperature of 980°C.

[0030] The pre-fired particles are then subjected to secondary sand grinding, and at the same time, Ta 2 o 5 (400ppm), SiO 2 (200ppm) and ZrO 2 (100ppm), the average particle size after sanding is controlled at about 0.7-0.9 microns.

[0031] Add 10wt% of the PVA solution with a concentration of 7-9wt% to the material after the second sanding, stir for 2 hours, spray granulate to make 40-160 mesh particles, and adjust the humidity of the particles...

Embodiment 3

[0034] The main ingredient is Fe 2 o 3 , Mn 3 o 4 And ZnO composition, according to 53mol% Fe 2 o 3 , 40mol% Mn 3 o 4 , and the balance is ZnO, and the main ingredients are weighed.

[0035] The above main materials and Co 3 o 4 (2000ppm) and TiO 2 (1000ppm) into the sand mill for a sanding time of 30 minutes.

[0036] The material after primary sand grinding is dried by a spray dryer to obtain granules, and the granules are pre-fired in a rotary kiln in a pass-through method at a temperature of 950 °C.

[0037] The pre-fired particles are then subjected to secondary sand grinding, and at the same time, Ta 2 o 5 (200ppm), SiO 2 (500ppm) and V 2 o 5 (100ppm), the average particle size after sanding is controlled at about 0.7-0.9 microns.

[0038] Add 10wt% of the PVA solution with a concentration of 7-9wt% to the material after the second sanding, stir for 2 hours, spray granulate to make 40-160 mesh particles, and adjust the humidity of the particles (moisture ...

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Abstract

The invention discloses a method for manufacturing low-loss manganese-zinc ferrite. The main ingredients of the manganese-zinc ferrite comprise the following components: 52-55mol% of iron oxide, 37-43mol% of manganese tetroxide and the balance of zinc oxide. The method comprises the following steps: carrying out primary sanding on the main ingredients, blending Co3O4 and at least one of TiO2, Ni2O3 and SnO2, wherein the total blending amount is 1000-5000ppm; pre-sintering at a temperature of 850-980 DEG C; after the pre-sintering is completed, carrying out secondary sanding and blending Ta2O5, SiO2 and at least one of Nb2O5, ZrO2, CaCO3 and V2O5, wherein the total blending amount is 700-1200ppm; granulating, molding; and sintering at a temperature of 1150-1250 DEG C and oxygen partial pressure of 3-6%. Compared with a conventional magnetic core, the manganese-zinc ferrite magnetic core obtained by the method has the characteristics of wide temperature range and low power loss, especially at a low temperature.

Description

technical field [0001] The invention belongs to the field of magnetic materials, and in particular relates to a method for manufacturing low-loss manganese-zinc ferrite. Background technique [0002] With the continuous advancement of power electronics technology, the electronic machine system is developing in the direction of small and lightweight, multi-functional, surface mount, integrated digital and intelligent, and the requirements for green and high-efficiency in general applications are becoming more and more High, and more importantly, in order to adapt to the application of different environments around the world, the power supply is required not only to adapt to high temperature environments, but also to adapt to ultra-low temperature environments, so that the requirements for magnetic materials are getting higher and higher, requiring magnetic materials It has superior low loss performance not only at high temperature, but also at room temperature and even at ult...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
CPCC04B35/2658C04B2235/3208C04B2235/3239C04B2235/3244C04B2235/3251C04B2235/3418C04B2235/656
Inventor 赵新江
Owner WUXI SPINEL MAGNETICS
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