Porous fibrous carbon/magnetic electromagnetic wave absorbing material and preparation method thereof
A technology of porous fibers and absorbing materials, applied in shielding materials, magnetic field/electric field shielding, electrical components, etc., can solve the problems of single electromagnetic wave loss mechanism, difficult molding, heavy product quality, etc., achieve weight reduction and improve interface polarization , Enhance the effect of electromagnetic wave loss
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Embodiment 1
[0037] A porous fibrous carbon / magnetic and electromagnetic wave absorbing material, based on activated carbon fibers, there are a large number of pores on the surface of the fibers, and the magnetic loss material Fe is loaded on the surface and inside of the fibers 3 o 4 .
[0038] A kind of preparation method of porous fibrous carbon / magnetic electromagnetic wave absorbing material, concrete steps are as follows:
[0039] (1) The polyacrylonitrile (PAN)-based pre-oxidized silk felt was washed with deionized water, dried, and then treated with plasma at room temperature for 20 s to prepare a surface-etched PAN-based pre-oxidized silk felt (S1).
[0040] (2) Soak S1 in a phosphoric acid solution with a concentration of 20% for 20 hours, and dry the soaked S1 to prepare a PAN-based pre-oxygenated silk felt containing phosphoric acid (S2).
[0041] (3) Under the protection of nitrogen, S2 was activated at 300° C. for 5 h, then washed with deionized water and dried for later us...
Embodiment 2
[0047] A kind of porous fibrous carbon / magnetic electromagnetic wave absorbing material, concrete steps are as follows:
[0048] (1) The PAN-based pre-oxidized silk felt was washed with deionized water, dried, and then plasma-treated at room temperature for 100 s to prepare a surface-etched PAN-based pre-oxidized silk felt (S1).
[0049] (2) Soak S1 in a phosphoric acid solution with a concentration of 30% for 5 hours, and dry the soaked S1 to prepare a PAN-based pre-oxidized silk felt containing phosphoric acid (S2).
[0050] (3) Under the protection of nitrogen, activate S2 at 600° C. for 1 h, then wash and dry it with deionized water for later use, and prepare activated carbon fiber felt (S3).
[0051] (4) Further expand the pores of S3, and activate the S3 by injecting water vapor at 1000° C. for 1 min to prepare the activated carbon fiber mat (S4) after the pores were expanded.
[0052] (5) S4 was subjected to plasma treatment at room temperature for 50 s, and then ferri...
Embodiment 3
[0055] A kind of porous fibrous carbon / magnetic electromagnetic wave absorbing material, concrete steps are as follows:
[0056] (1) The PAN-based pre-oxidized silk felt was washed with deionized water, dried, and then treated with plasma at room temperature for 60 s to prepare a surface-etched PAN-based pre-oxidized silk felt (S1).
[0057] (2) Soak S1 in a phosphoric acid solution with a concentration of 30% for 12 hours, and dry the soaked S1 to prepare a PAN-based pre-oxygenated silk felt containing phosphoric acid (S2).
[0058] (3) Under the protection of nitrogen, S2 was activated at 550° C. for 2 h, then washed with deionized water and dried for later use to prepare an activated carbon fiber felt (S3).
[0059] (4) S3 was further expanded, and S3 was activated by injecting water vapor at 950° C. for 2 minutes to prepare an expanded activated carbon fiber felt ( S4 ).
[0060] (5) Prepare 1mol / L ferric chloride solution, soak S4 in the ferric chloride solution for 2h, ...
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