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Method for preparing nano soft magnetic manganese-zinc ferrite

A manganese-zinc ferrite and soft magnetic technology, which is applied in the direction of inorganic material magnetism, can solve the problems of low product yield, high cost, high energy consumption, etc., and achieve high product yield, improved magnetic performance, and low production cost. Effect

Inactive Publication Date: 2008-10-01
HEBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for preparing nano-soft magnetic manganese-zinc ferrite, which adopts a low-temperature two-step sintering process, has low sintering temperature, short sintering time, and does not require a high-temperature solid-phase chemical reaction process, thereby overcoming Disadvantages of high energy consumption, high cost and low product yield

Method used

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  • Method for preparing nano soft magnetic manganese-zinc ferrite
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  • Method for preparing nano soft magnetic manganese-zinc ferrite

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The first step is the preparation of manganese-zinc ferrite nano-powder

[0028] First take 30ml FeSO with a concentration of 1mol / L 4 Solution, adjust its pH value to 8.70 with 6M NaOH solution, and then add 1.6ml of H with a mass percentage concentration of 27.5% 2 O 2 , Which is 0.015mol of H 2 O 2 Carry out oxidation, react for 30-40 minutes, then adjust the pH value of the suspension to 13.00 with a NaOH solution with a concentration of 6mol / L, and then the molar ratio is Fe 2+ : Mn 2+ : Zn 2+ =1:0.33:0.17, add 9.9ml of MnSO with a concentration of 1mol / L 4 Solution and 5.1ml ZnSO with a concentration of 1mol / L 4 The resulting suspension is boiled and refluxed for 8 hours to form black manganese-zinc ferrite nanocrystals. Then, 30ml of citric acid with a mass percentage concentration of 4.76% is used for ultrasonic dispersion for 20 minutes. The mass ratio of iron ions is 1:4.4, and then drying and grinding are carried out in an oven ≤50°C to obtain nano-manganese-zinc...

Embodiment 2

[0035] The first step is the preparation of manganese-zinc ferrite nano-powder

[0036] The same as in Example 1.

[0037] The second step is to press into a ring-shaped blank

[0038] The same as in Example 1.

[0039] The third step is to sinter the product

[0040] Put the formed blank prepared in the second step into a tubular resistance furnace, and under the protection of nitrogen, increase the temperature from room temperature to 900°C at a rate of 5°C / min. Then, after 10 minutes of natural cooling, the temperature drops to At 850°C, keep it at this temperature for 2 hours, then cool it naturally to room temperature, and finally obtain a soft magnetic manganese-zinc ferrite sintered body, that is, a nano soft magnetic manganese-zinc ferrite product.

[0041] image 3 This is the scanning electron micrograph of the nano soft magnetic manganese-zinc ferrite product prepared in this example. It can be seen from the figure that the nano soft magnetic manganese-zinc ferrite mat...

Embodiment 3

[0043] The second step is to press into a ring-shaped blank

[0044] The same as in Example 1.

[0045] The third step is to sinter the product

[0046] Put the formed blank prepared in the second step into a tubular resistance furnace, and under the protection of nitrogen, increase the temperature from room temperature to 1100°C at a rate of 5°C / min. Then, after 20 minutes of natural cooling, the temperature drops to At 850°C, keep it at this temperature for 2 hours, then cool it naturally to room temperature, and finally obtain a soft magnetic manganese-zinc ferrite sintered body, that is, a nano soft magnetic manganese-zinc ferrite product.

[0047] Figure 4 This is the scanning electron micrograph of the nano soft magnetic manganese-zinc ferrite product prepared in this example. It can be seen from the figure that the nano-soft magnetic manganese-zinc ferrite material has fewer internal pores, uniform and dense particles, and an average particle size of 3 to 4 μm. This shows...

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Abstract

The invention discloses a preparation method of a nanometer soft magnetic manganese zinc ferrite preparation method, belonging to the ferrite magnetic material technology field. The method comprises: a first step of preparing manganese zinc ferrite nanometer power; a second step of pressing to form a circular blank; a third step of sintering the prepared product, i.e., putting the formed blank in the second step into a tube electric resistance furnace, rising the temperature from the room temperature to 900-1100 DEG C at a speed of 5 DEG C / minute under nitrogen protection, free-cooling the temperature to 850 DEG C, insulating heat under the temperature in two hours, then free-cooling to the room temperature, and finally obtaining the soft magnetic manganese zinc ferrite sinter, i.e., the nanometer soft magnetic manganese zinc ferrite product. The method of the invention adopts a low-temperature two-step sintering process, has low sintering temperature, short sintering time and no high-temperature solid-phase chemical reaction process, thereby realizing energy-saving, consumption reduction, low production cost and high yield.

Description

Technical field [0001] The technical scheme of the present invention belongs to the technical field of ferrite magnetic materials, and specifically relates to a preparation method of nano soft magnetic manganese-zinc ferrite. Background technique [0002] As the overall electronic system develops towards integrated intelligence, planar mounting, small size and light weight, its power supply is required to develop towards high frequency. The key to achieving high frequency power supply is to use high frequency and low loss power ferrite. Because manganese-zinc ferrite has high magnetic permeability, high density, high saturation magnetic induction, high Curie temperature and high resistivity characteristics, it is a high-frequency low-loss power ferrite, so it Become an ideal material for making high-frequency power supplies. [0003] The sintering process is the key to the preparation of high-performance soft magnetic manganese-zinc ferrite. To obtain high-performance high-freque...

Claims

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Application Information

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IPC IPC(8): H01F1/36C04B35/26C04B35/622
Inventor 王新魏雨康志龙姜延飞刘春静郝顺利王永明崔银芳
Owner HEBEI UNIV OF TECH
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