Millimeter-wave electromagnetic wave absorbing material, preparation method and application thereof
A technology of absorbing materials and electromagnetic waves, which is applied in the field of materials, can solve the problems of complex preparation of millimeter wave absorbing materials, narrow absorption bandwidth, and low efficiency, and achieve excellent magnetoelectric properties, simple preparation methods, and easy operation
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Embodiment 1
[0039] In this embodiment, the iron-based rare earth intermetallic compound magnetic powder is Ce 2 Fe 17 , the carbon material is graphene, and the polymer binder is polyurethane.
[0040] Weigh Ce and Fe elements according to the alloy ratio, and obtain metal powder with a particle size of less than 5 μm through smelting, rapid quenching, and ball milling processes, and its composition is Ce 2 Fe 17 , with an average particle size of about 3.5 μm.
[0041] Polyurethane (PU) was dissolved in cyclohexanone, mixed into a magnetic powder adhesive slurry according to the weight ratio of polyurethane and metal powder at a ratio of 1:2.3, and Ce with a thickness of 1 mm was prepared by casting and hot pressing. 2 Fe 17The composite material was then cut into ring-shaped samples, and its magnetoelectric properties were analyzed using a vector network analyzer.
[0042] With the above process conditions, a graphene composite material with a thickness of 1mm was prepared, wherein...
Embodiment 2
[0047] In this embodiment, the iron-based rare earth intermetallic compound magnetic powder is Y 2 co 7 Fe 10 , the carbon material is graphite, and the polymer binder is epoxy resin.
[0048] Weigh Y, Fe, and Co elements according to the alloy ratio, and obtain metal powder with a particle size of less than 5 μm through smelting, rapid quenching, and ball milling processes, and its composition is Y 2 co 7 Fe 10 , with an average particle size of about 3.5 μm.
[0049] Dissolve the epoxy resin in acetone, mix the epoxy resin and the metal powder into a magnetic powder adhesive slurry according to the weight ratio of 1:1.72, and prepare a Y with a thickness of 1 mm by casting and hot pressing. 2 co 7 Fe 10 The composite material was then cut into ring-shaped samples, and its magnetoelectric properties were analyzed using a vector network analyzer.
[0050] With the above process conditions, a graphite composite material with a thickness of 1mm was prepared, wherein the ...
Embodiment 3～10
[0055] The preparation process of embodiment 3~10 is the same as embodiment 1, and composite material performance parameter is as shown in the following table:
[0056]
[0057]
[0058] It can be seen from the above table that after compounding different rare earth iron-based intermetallic compound absorbers with corresponding carbon materials, the peak absorption intensity of the obtained absorbing materials in the millimeter wave band is better than -20dB, and the effective bandwidth of absorbing less than -10dB exceeds 10GHz, and the absorbing materials The overall thickness is less than 1mm.
[0059] The electromagnetic wave absorbing materials prepared above all have the advantages of simple preparation, light weight, broadband and high efficiency. It can be widely used in military radar systems, radio astronomy and space, automotive radar, millimeter-wave imaging for medical applications, and short-distance wireless high-speed transmission.
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Abstract
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