SiO2-coating-based preparation method of carbonyl iron powder composite wave-absorbing material

Abstract

The invention provides an SiO2-coating-based preparation method of a carbonyl iron powder composite wave-absorbing material. The preparation method comprises the steps that S1, carbonyl iron powder isadded into deionized water to form a mixture, the mass percent of the carbonyl iron powder is 1%-5%, and ultrasonic treatment is conducted on the mixture for 1-2 min to obtain a system A; S2, tetraethoxysilane and a silane coupling agent are added into absolute ethyl alcohol to form a mixture, the mass percents of the tetraethoxysilane and the silane coupling agent are both 0.5%-2%, and a systemB is obtained; S3, the system A and the system B are mixed, then a catalyst for facilitating hydrolysis of tetraethoxysilane is added into the mixture, mixed liquid is formed, the mass percent of thecatalyst is 0.2%-1%, the mixed liquid is subjected to thermostatic water-bath heating for 2-4 h under stirring of a magnetic stirrer, and water-bath temperature is 40-60 DEG C; S4, supernatant in themixed liquid is poured out, lower layer precipitates are washed repeatedly through deionized water, and the carbonyl iron powder is gathered constantly through magnetism of the magnetic stirrer; and S5, products obtained in S4 are subjected to vacuum drying for 18-24 h under the condition of 50-70 DEG C, then grinding is conducted for 4-6 min, and operation is completed. The wave-absorbing material prepared through the preparation method has good wave-absorbing performance.

Description

technical field [0001] The invention relates to the technical field of preparation of wave absorbing materials, in particular to a SiO-based 2 A preparation method of a coated carbonyl iron powder composite wave absorbing material. Background technique [0002] With the continuous progress of science and technology, the application technology of electromagnetic waves has also continued to develop, but these technologies bring a lot of convenience and also bring a lot of electromagnetic wave pollution, which brings many adverse effects to people's life and work, such as some precision The device may therefore behave abnormally. Therefore, the development and application of absorbing materials has become the focus of attention of people (especially researchers). [0003] Carbonyl iron powder has a wide range of application prospects in wave absorbing materials due to its good temperature stability, high magnetic permeability and low production cost. absorbent. However, the...

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Problems solved by technology

However, the inherent defects of magnetic particles such as high surface density, poor chemical stability, and easy agglomeration limit the application of carbonyl iron powder.

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