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Soft magnetic ferrite material and preparation process thereof

A technology of soft magnetic ferrite and magnetic flux density, applied in the direction of magnetism of inorganic materials, can solve the problems of limiting the miniaturization of electronic devices, low saturation magnetic flux density, high magnetic loss, etc., to achieve mass production and improve resistivity , low cost effect

Active Publication Date: 2011-09-21
WUXI SPINEL MAGNETICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are many shortcomings in the existing soft magnetic ferrite materials: low frequency, low saturation magnetic flux density, high magnetic loss, which limit the development of miniaturization and light weight of electronic devices

Method used

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  • Soft magnetic ferrite material and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A soft ferrite material, the composition and molar ratio are: 55mol Fe 2 o 3 , 39mol Mn 3 o 4 , 6mol ZnO, 0.15mol SnO 2 , a total of 0.1 to 0.15mol of Nb 2 o 5 , V 2 o 5 .

[0037] The preparation method of above-mentioned soft magnetic ferrite material is as follows:

[0038] 1) the main material Fe 2 o 3 , Mn 3 o 4 , ZnO and additive SnO 2 Carry out wet mixing for the first time according to the molar ratio;

[0039] 2) The above-mentioned mixed materials are granulated with a spray dryer, and then pre-fired in a rotary kiln through a rotary kiln. The magnetization of the fired material is well controlled at 3A*m 2 Within / kg;

[0040] 3) Carry out the second wet sand milling of the pre-burned material: add the additive 2Nb according to the above ratio 2 o 3 , V 2 o 5 ; The average particle size after wet pulverization is 0.9-1.0 microns, so that the sintered Bs has room for improvement;

[0041] 4) Add PVA glue with a concentration of 8% to 12% t...

Embodiment 2

[0044] A soft magnetic ferrite material, the composition and molar ratio are: 52mol Fe 2 o 3 , 40mol of Mn 3 o 4 , 8mol of ZnO, 0.1mol of CaCO 3 , a total of 0.12mol of CaCO 3 、 Ta 2 o 5 , SnO 2 , 0.006mol of ZrO 2 .

[0045] The preparation method of above-mentioned soft magnetic ferrite material is as follows:

[0046] 1) the main material Fe 2 o 3 , Mn 3 o 4 , ZnO and additive CaCO3 The first wet mixing is carried out according to the molar ratio.

[0047] 2) The above-mentioned mixed materials are granulated with a spray dryer, and then pre-fired in a rotary kiln through a rotary kiln. The magnetization of the fired material is well controlled at 3A*m 2 / kg or less.

[0048] 3) Carry out the second wet sand milling of the pre-burned material: add the additive CaCO according to the above ratio 3 、 Ta 2 o 5 , SnO 2 and ZrO 2 , the ZrO 2 The addition of Bs can further reduce the loss of materials and increase the saturation magnetic flux density; the ave...

Embodiment 3

[0052] A soft magnetic ferrite material, the composition and molar ratio are: 53mol Fe 2 O, 40mol of Mn 3 o 4 , 7mol of ZnO, 0.1mol of V 2 o 5 , a total of 0.13mol of Ta 2 o 5 , SnO 2 , V 2 o 5 , 0.025mol of ZrO 2 .

[0053] The preparation method of above-mentioned soft magnetic ferrite material is as follows:

[0054] 1) the main material Fe 2 o 3 , Mn 3 o 4 , ZnO and additive V 2 o 5 The first wet mixing is carried out according to the molar ratio.

[0055] 2) The above-mentioned mixed materials are granulated with a spray dryer, and then pre-fired in a rotary kiln through a rotary kiln. The magnetization of the fired material is well controlled at 3A*m 2 / kg or less.

[0056] 3) The pre-burned material is subjected to the second wet sand milling: add the additive Ta according to the above ratio 2 o 5 , SnO 2 , V 2 o 5 and ZrO 2 , the ZrO 2 The addition of Bs can further reduce the loss of materials and increase the saturation magnetic flux density...

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Abstract

The invention discloses a soft magnetic ferrite material and a preparation process thereof. The soft magnetic ferrite material comprises the following components: 52 to 55 mol of Fe2O3, 39 to 42 mol of Mn3O4, 5-8 mol of ZnO, 0.1 to 0.6 mol of additive 1, 0.1 to 0.2 mol of additive 2 and 0.006 to 0.06 mol of ZrO2, wherein the additive 1 is one or more of SnO2, CaCO3 and V2O5; and the additive 2 isone or more of Nb2O5, K2CO3, CaCO3, Ta2O5, SnO2 and V2O5. The soft magnetic ferrite material prepared by the process overcomes defects of the prior art and has the advantages of high frequency, high saturation magnetic flux density and low magnetic loss.

Description

technical field [0001] The invention relates to a material and a preparation process thereof, in particular to a soft ferrite material and a preparation process thereof. Background technique [0002] With the development of electronic information technology products, electronic devices tend to be miniaturized, light-weight and high-frequency operating frequency, the driving frequency of the power transformer has risen from about 25KHZ to 100-500KHZ range, (such as the transformer used in the car start system and Transformers for LED lighting, etc.) This puts forward higher requirements for the performance of soft magnetic MnZn power ferrite cores. Common such as TDK's PC40, PC44, FDK's 6H20, 6H40, Siemens' N72, Philips 3C85, 3F3, the typical index is 0.05KHz / 1194A / m at room temperature Bs at 490~510mT, high temperature Bs at 390~410mT, 100KHZ / 200mT loss requirement is 400mW / cm 3 about. However, there are many shortcomings in the existing soft ferrite materials: low frequ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/34C04B35/26C04B35/622
Inventor 赵新江
Owner WUXI SPINEL MAGNETICS
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