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Preparation method for flaky carbonyl iron powder with high magnetic permeability

A technology of carbonyl iron powder and high magnetic permeability, which is applied in the field of preparation of high magnetic permeability flaky carbonyl iron powder, can solve the problems of excessive dielectric properties of iron powder, increased magnetic permeability, and adverse effects on overall performance. Achieve the effects of reducing preparation costs, improving magnetic permeability, and excellent electromagnetic absorption performance

Inactive Publication Date: 2012-12-12
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods can be used in industrial production, but there are problems in the wet ball milling of carbonyl iron; although ball milling can obtain flaky carbonyl iron powder, the iron powder obtained by pure wet ball milling has too high dielectric properties. while making the increase in permeability insignificant and thus adversely affecting the overall performance

Method used

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  • Preparation method for flaky carbonyl iron powder with high magnetic permeability
  • Preparation method for flaky carbonyl iron powder with high magnetic permeability
  • Preparation method for flaky carbonyl iron powder with high magnetic permeability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) One ball mill

[0027] At room temperature, weigh 100 g of dry and clean steel balls with a diameter of 4 mm, 10 g of carbonyl iron powder and 0.01 g of calcium stearate into a 100 ml ball mill jar, and add 40 ml of acetone solution, and use a planetary ball mill For ball milling, the parameters were set as follows: speed 500 rpm; time 8 h.

[0028] 2) Wet powder drying

[0029] The ball-milled iron powder was taken out and washed 3 times with absolute ethanol. At room temperature, blow dry.

[0030] 3) Secondary ball milling

[0031] Add the dried powder and 4 mm steel balls into the ball mill jar according to the original ratio, and continue ball milling at a speed of 500 rpm for 10 min.

[0032] 4) Separation of iron powder and steel ball

[0033] After the second ball milling, the sample is sieved and separated, and the obtained sample is flaky carbonyl iron powder.

[0034]

Embodiment 2

[0036] 1) One ball mill

[0037] At room temperature, weigh 50 g of dry and clean steel balls with a diameter of 6 mm, 75 g of 3 mm steel balls, 7.5 g of carbonyl iron powder and 0.05 g of calcium stearate and place them in a 100 ml ball mill jar, and add 50 ml of ethanol solution, A planetary ball mill was used for ball milling, and the parameters were set as follows: speed 400 rpm; time 6 h.

[0038] 2) Wet powder drying

[0039] The ball-milled iron powder was taken out and washed 3 times with absolute ethanol. Dry in a drying oven at 50°C.

[0040] 3) Secondary ball milling

[0041] Put the dried powder and 6 mm and 3 mm steel balls into the ball mill jar according to the original ratio, and continue ball milling at a speed of 400 rpm for 10 min.

[0042] 4) iron powder is separated from steel ball (same as embodiment 1)

Embodiment 3

[0044] 1) One ball mill

[0045] At room temperature, weigh 50 g of dry and clean steel balls with a diameter of 6 mm, 100 g of 4 mm steel balls, 5 g of carbonyl iron powder and 0.1 g of calcium stearate and place them in a 100 ml ball mill jar, and add 30 ml of n-hexane solution , using a planetary ball mill for ball milling, the parameters are set as follows: speed 600 rpm; time 10 h.

[0046] 2) Wet powder drying

[0047] The ball-milled iron powder was taken out and washed 3 times with absolute ethanol. Dry in a drying oven at 70°C.

[0048] 3) Secondary ball milling

[0049] In this example, secondary ball milling is not used, and the next step is directly entered.

[0050] 4) iron powder is separated from steel ball (same as embodiment 1)

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Abstract

The invention relates to a preparation method for flaky carbonyl iron powder with high magnetic permeability, and belongs to the field of magnetic wave absorbing materials. The method comprises the following steps: 1, carrying out a primary ball milling process: at a room temperature, weighing 100-150 g of steel balls with a diameter of 3-6 mm, 5-10 g of carbonyl iron powder, and 0.01-0.1 g of a surfactant calcium stearate, measuring 30-50 ml of an organic solution, adding the materials and the solution to a 100 ml ball mill tank, and carrying out ball milling in a planetary type ball mill; 2, washing the carbonyl iron powder with the primary ball milling three times by using ethanol, and carrying out blow-drying at a room temperature or carrying out rapid drying at a temperature of 50-70 DEG C; 3, carrying out a secondary ball milling process: mixing the dried carbonyl iron powder and steel balls with a diameter of 3-6 mm according to the ratio of the primary ball milling process described in the step 1, and then carrying out ball milling for 2-10 minutes at a speed of 400-600 rotation / min; and 4, cooling the ball milling tank, and then separating the iron powder and the steel balls to obtain the flaky carbonyl iron powder sample. The process of the preparation method of the present invention is simple. With the preparation method of the present invention, a dielectric property is not changed while high magnetic permeability is provided.

Description

technical field [0001] The invention relates to a preparation method of high-permeability flaky carbonyl iron powder, which belongs to the field of magnetic wave-absorbing materials. Background technique [0002] With the continuous development of absorbing materials, the attention of magnetic absorbing materials is getting higher and higher. Metal micropowder absorbing materials have the advantages of high Curie temperature, good temperature stability, the highest magnetization among magnetic materials, large microwave permeability, and high dielectric constant, so they are widely used in the field of absorbing materials. Metal micropowder absorbing materials have been practically applied. For example, the US F / A-18C / D "Bumblebee" stealth aircraft uses carbonyl iron micro-powder absorbing materials. [0003] The magnetic absorbing material is mainly ferromagnetic resonance absorption, which uses eddy current loss, hysteresis loss and residual loss mechanism to attenuate a...

Claims

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Application Information

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IPC IPC(8): C01G49/16B82Y30/00
Inventor 姬广斌黄琪慧李晓光
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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