Sendust electromagnetic wave absorbent and preparation method thereof
An electromagnetic wave and absorber technology, which is applied in the field of iron-silicon-aluminum electromagnetic wave absorber and its preparation, can solve the problems of improvement, unfavorable wave absorption performance, difficulty in satisfying free space impedance matching conditions, etc., and achieves the effect of good absorption effect.
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[0022] A preparation method of sendust electromagnetic wave absorber, comprising:
[0023] Doping manganese-zinc ferrite into sendust powder, then ball-milling the doped mixture according to the material-ball ratio of 1:14-16, ball-milling for 5-50 hours, and drying to obtain sendust electromagnetic wave absorber. Manganese-zinc ferrite accounts for 0.5-5 at% of the iron-silicon-aluminum electromagnetic wave absorber, and the ratio of manganese-zinc ferrite is: 52-55 at% Fe 2 o 3 , 33-36at% MnO, 10-14at% ZnO.
[0024] specifically:
[0025] S1. Vacuum melting iron, silicon and aluminum into alloy ingots.
[0026] High-purity iron rods, silicon particles and aluminum ingots with a purity greater than 99.9% are used to prepare raw materials according to the proportions of 72.5-75.5at% Fe, 15-17.5at% Si, and 9.5-11.5at% Al, respectively, in a vacuum induction melting furnace Smelting alloys. The vacuum degree before smelting is less than 0.1Pa, and the vacuum degree is contr...
Embodiment 1
[0040] This embodiment provides a sendust electromagnetic wave absorber and a preparation method thereof.
[0041] A preparation method of sendust electromagnetic wave absorber, comprising:
[0042] High-purity iron rods, silicon particles and aluminum ingots with a purity greater than 99.9% are used to prepare raw materials at the ratio of 72.5at% Fe, 17.5at% Si, and 10at% Al respectively, and the alloy is melted in a vacuum induction melting furnace. The vacuum degree before smelting is less than 0.1Pa, and the vacuum degree is controlled to 1Pa during the capacity process to ensure that the vacuum requirement for raw materials in smelting is met. After smelting to obtain the melt, melt the melt for 2 minutes and pour it into ingots for crushing.
[0043] The alloy ingot obtained in S1 is preliminarily broken into particles with a particle size of about 100 μm in a crusher.
[0044] use and Three kinds of stainless steel balls are mixed, the alloy particles are place...
Embodiment 2- Embodiment 5
[0049] Example 2-Example 5 are basically the same as Example 1, except that the milling time of the manganese-zinc-ferrite and the sendust powder made by S5 in the ball mill is 15h, 25h, 35h, and 45h, respectively.
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