Method for preparing MnZn ferrite with adding silane coupling agent

A silane coupling agent and ferrite technology, which is applied in the field of ferrite magnetic materials, can solve the problems of uneven microstructure, uneven distribution, and low molding density of sintered bodies, so as to reduce loss, particle agglomeration, and The effect of reunion

Active Publication Date: 2012-01-11
HEBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for adding silane to the problems of low molding density and uneven distribution, resulting in uneven microstructure and poor performance of the sintered body when preparing MnZn ferrite with nano-powders. Coupling agent prepares the method for MnZn ferrite

Method used

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  • Method for preparing MnZn ferrite with adding silane coupling agent
  • Method for preparing MnZn ferrite with adding silane coupling agent
  • Method for preparing MnZn ferrite with adding silane coupling agent

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Embodiment 1: the concrete steps of this embodiment are as follows:

[0029] The first step is to prepare MnZn ferrite nanopowder

[0030] MnZn ferrite nano-powder is prepared according to the method disclosed in patent CN101276668A, except that in this example, after the black manganese-zinc ferrite nano-crystal is prepared, it is directly dried in an oven at 80°C to obtain a powder with an average particle size of 26nm. MnZn ferrite nanopowder, and its nominal chemical formula is Mn 0.65 Zn 0.35 Fe 2 o 4 .

[0031] The second step is to introduce the silane coupling agent

[0032] Weigh 15 grams of MnZn ferrite nanopowder, add 0.021 gram of vinyltriethoxysilane coupling agent (the mass of silicon element is 0.02% of the powder) into the powder, and carry out uniform stirring and mixing. Laser particle size analysis of the powder before and after adding the silane coupling agent, the results are as follows figure 1 , figure 2 shown. Depend on figure 1 It can...

Embodiment 2

[0038] The first step is to prepare MnZn ferrite nanopowder

[0039] MnZn ferrite nano-powder is prepared according to the method disclosed in patent CN101276668A, except that in this embodiment, after the black manganese-zinc ferrite nano-crystal is prepared, it is directly dried in an oven at 80°C to obtain a powder with an average particle diameter of 23nm. MnZn ferrite nanopowder, and its nominal chemical formula is Mn 0.5 Zn 0.5 Fe 2 o 4 .

[0040] The second step is to introduce the silane coupling agent

[0041] Weigh 15 grams of MnZn ferrite nanopowder, add 0.008 gram of vinyltrimethoxysilane coupling agent (silicon element mass is 0.01% of the powder) to the powder, stir and mix evenly, and carry out Press into tablets, and then use a mortar to grind into powder.

[0042] The third step, add binder and shape

[0043] Add polyethylene glycol (PEG) into the powder obtained in the second step in an amount of 3% of the mass of the powder, put it into a mortar and m...

Embodiment 3

[0047] The first step is to prepare MnZn ferrite nanopowder

[0048] MnZn ferrite nano-powder is prepared according to the method disclosed in patent CN101276668A, except that in this embodiment, after the black manganese-zinc ferrite nano-crystal is prepared, it is directly dried in an oven at 80°C to obtain a powder with an average particle diameter of 25nm. MnZn ferrite nanopowder, and its nominal chemical formula is Mn 0.6 Zn 0.4 Fe 2 o 4 .

[0049] The second step, doping and introducing silane coupling agent

[0050] Weigh 5 grams of MnZn ferrite nano-powder, add 0.001 gram of CaO white powder, and put them into a ball mill jar at a speed of 300 rad / min, and ball mill for 6 hours. Then add 0.009 g of vinyltrichlorosilane coupling agent (the mass of silicon element is 0.03% of the powder) into the powder. Then put into the ball mill jar, the rotating speed is 100rad / min, ball mill for 0.5 hour.

[0051] The third step, add binder and shape

[0052] Add polyvinyl b...

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Abstract

The invention relates to a method for preparing MnZn ferrite with adding a silane coupling agent. The method comprises the following steps: 1, adding ferrite nanopowder to the silane coupling agent, and mixing with stirring, wherein the chemical formula of the ferrite nanopowder is Mn1-xZnxFe2O4, and x is equal to or more than 0.34 and equal to or less than 0.62; 2, adding an organic binder to the powder obtained in step 1, putting to a mortar, and uniformly mixing to obtain powder; 3, preparing an annular biscuit by carrying out dry press molding on the powder obtained in step 2 at 200MPa; and 4, and sintering to obtain products. According to the invention, the microstructure of the MnZn ferrite is improved, the density and the magnetic property of the MnZn ferrite are improved, the density of a sintered body (the MnZn ferrite) is 4.83g/cm<3>, the saturated magnetic induction intension Ms of the sintered body is 92.18emu/g, and the residual magnetization Mr of the sintered body is 10.68emu/g, and the coercive force Hc is 60.650e; in addition, a doping link in the molding process is omitted, so the molding process is simplified, and resources are saved.

Description

technical field [0001] The invention relates to a method for preparing MnZn ferrite by adding a silane coupling agent, belonging to the technical field of ferrite magnetic materials. Background technique [0002] With the development trend of high frequency, miniaturization and thinning of power electronic devices, higher requirements are put forward for MnZn ferrite. High-performance MnZn ferrite should have a uniform, fine, and dense microstructure, and doping substances need to be added to make it gather at the grain boundary to increase grain boundary resistance and reduce loss. [0003] In recent years, with the rapid development of nanotechnology, the preparation technology of MnZn ferrite nanopowder has also been developed rapidly. Using nano-powder as raw material, forming and sintering to prepare high-frequency and low-loss MnZn ferrite with ideal microstructure has become a new research hotspot. [0004] Compared with ordinary ferrite powders, MnZn ferrite nanopo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 王新王桂新彭会芬姜延飞未波波张玉孟吴红霞
Owner HEBEI UNIV OF TECH
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