Ceramic whisker/ferromagnetic metal composite wave-absorbing material and preparation method thereof
A composite wave absorbing material and ceramic whisker technology, which is applied in the parts, shielding, instruments and other directions of the instrument, can solve the problems of low wave absorption efficiency, difficult industrial production, complicated preparation process, etc., and achieves the improvement of complex dielectric constant, The effect of improving the complex magnetic permeability and the smooth and dense coating
Inactive Publication Date: 2009-09-30
HARBIN INST OF TECH
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Problems solved by technology
[0003] The technical problem to be solved by the present invention is to provide a ceramic whisker / ferromagnetic metal composite wave-absorbing material in order to solve the problems of low wave-absorbing efficiency of existing wave-absorbing materials, complex preparation process, and difficulty in realizing large-scale industrial production and its preparation method
Method used
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specific Embodiment approach 1
[0009] Embodiment 1: In this embodiment, the ceramic whisker / ferromagnetic metal composite wave-absorbing material is made of ceramic whisker coated with a ferromagnetic metal coating. The ferromagnetic metal coating described in this embodiment is Co or FeCo.
specific Embodiment approach 2
[0010] Embodiment 2: This embodiment differs from Embodiment 1 in that the thickness of the ferromagnetic metal coating is 0.05 μm˜1 μm. Others are the same as in the first embodiment.
specific Embodiment approach 3
[0011] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the ceramic whiskers are SiC whiskers or Al 18 B 4 o 33 whiskers. Others are the same as in the first embodiment.
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Abstract
The invention discloses a ceramic whisker / ferromagnetic metal composite wave-absorbing material and a preparation method thereof, relates to a composite material for absorbing electromagnetic waves and a preparation method thereof, and solves the problems that the prior wave-absorbing material has low wave-absorbing efficiency and complex preparation process and is difficult to achieve large-scale industrial production. The ceramic whisker / ferromagnetic metal composite wave-absorbing material is made of ceramic whisker of which the surface is plated with a ferromagnetic metal layer. The preparation method comprises the following steps: thermally treating the ceramic whisker of which the surface is plated with the ferromagnetic metal layer for 60 minutes at a temperature of between 300 and 400 DEG C under the condition that the thermal treatment atmosphere is hydrogen or argon to obtain the ceramic whisker / ferromagnetic metal composite wave-absorbing material. The complex dielectric constants and complex magnetic conductivities of the ceramic whisker / ferromagnetic metal composite wave-absorbing material obtained by the method are remarkably improved; as an electromagnetic wave absorbing coat, the maximum absorption reaches 78dB, and the absorption bandwidth of more than 10dB is as high as 4GHz; and the method is simple and practical, and is suitable for large-scale production.
Description
technical field [0001] The invention relates to a composite material for absorbing electromagnetic waves and a preparation method thereof. Background technique [0002] With the rapid development and wide application of wireless communication technology and radar technology, the intensity of various electromagnetic waves in space is increasing sharply. These electromagnetic waves can also cause serious harm while transporting information. Mutual interference of communication and misoperation of high-frequency electronic equipment, on the other hand, long-term electromagnetic radiation will also seriously endanger human health; electromagnetic leakage will easily lead to the outflow of business secrets, technical secrets and other information. Using electromagnetic wave absorption technology to absorb harmful stray electromagnetic waves in space is one of the effective means to solve the above problems. The existing wave absorbing materials include ferrite powder, metal powde...
Claims
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Inventor 甄良姜建堂邵文柱徐成彦
Owner HARBIN INST OF TECH
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