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SiC@SiO2@ferrite high-temperature wave-absorbing composite material and preparation method thereof

A composite material and ferrite technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of no shielding effect, narrow absorbing range, complex preparation process, etc., and achieve controllable absorbing intensity, absorbing The effect of controllable frequency band and simple preparation process

Active Publication Date: 2019-01-11
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the technical problems of the existing wave-absorbing materials with complex preparation process, narrow wave-absorbing range and no shielding effect, and provides a SiC@SiO 2 @ferrite high-temperature wave-absorbing composite material and its preparation method

Method used

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  • SiC@SiO2@ferrite high-temperature wave-absorbing composite material and preparation method thereof
  • SiC@SiO2@ferrite high-temperature wave-absorbing composite material and preparation method thereof
  • SiC@SiO2@ferrite high-temperature wave-absorbing composite material and preparation method thereof

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specific Embodiment approach 1

[0040] Specific implementation mode 1: SiC@SiO in this implementation mode 2 @Ferrite high-temperature wave-absorbing composite material, with SiC as the core, and the core is covered with SiO 2 layer, on SiO2 Ferrite particles adhere to the layer.

[0041] SiC@SiO of this embodiment 2 The schematic diagram of the structure of @ferrite high-temperature wave-absorbing composite material is as follows figure 1 shown.

specific Embodiment approach 2

[0042] Embodiment 2: SiC@SiO described in Embodiment 1 2 The preparation method of @ferrite high-temperature wave-absorbing composite material is carried out according to the following steps:

[0043] 1. Silicon carbide surface pretreatment:

[0044] a. Put silicon carbide into a tube furnace, raise the temperature to 200-300°C in air or nitrogen atmosphere and keep it for 2h-4h to oxidize and remove surface impurities;

[0045] b. Disperse silicon carbide in an acidic hydrophilic solution and stir for 2h-4h, then ultrasonically disperse for 1h-2h, then wash with distilled water, filter, and dry to obtain hydrophilic silicon carbide;

[0046] 2. Synthesis of SiC@SiO 2 :

[0047] c. Disperse the hydrophilic silicon carbide into the mixed solvent of alcohol and water, then add the dispersant, cationic surfactant and emulsifier and stir evenly, then add the silane coupling agent, tetraethyl orthosilicate and catalyst, and then mix the solution Continue to stir and react for 6...

specific Embodiment approach 3

[0053] Specific embodiment 3: The difference between this embodiment and specific embodiment 2 is that the silicon carbide in step 1a is α-SiC or β-SiC, wherein α-SiC is 4H type, 15R type or 6H type; other and specific embodiment modes Two same.

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Abstract

The invention relates to a high-temperature wave-absorbing composite material and a preparation method thereof and provides a SiC@SiO2@ferrite high-temperature wave-absorbing composite material and apreparation method thereof. The objective of the invention is to overcome the technical problems of complex preparation technologies, narrow wave-absorbing ranges and no shielding effect of conventional wave-absorbing material preparation methods. The wave-absorbing composite material uses SiC as a core; a SiO2 layer coats the core; and ferrite particles are adhered onto the SiO2 layer. The preparation method comprises the following steps: 1, pretreating the surface of silicon carbide; 2, synthesizing silica-coated silicon carbide SiC@SiO2; 3, after sensitization and activation of SiC@SiO2, reacting the SiC@SiO2 with a salt for preparing ferrite and a strong reducing agent in alkaline liquor, then carrying out calcination so as to obtain the SiC@SiO2@ferrite high-temperature wave-absorbingcomposite material. The material of the invention has a reflection loss of less than -5dB in a 8-to-12-GHz band and a Ku band and a maximum reflection loss of -14 dB, and can be used in the field ofwave-absorbing materials.

Description

technical field [0001] The invention belongs to the field of high-temperature wave-absorbing functional composite materials, and specifically relates to a SiC@SiO 2 @ferrite high-temperature wave-absorbing composite material and its preparation method. Background technique [0002] With the development of modern science and technology, military detection methods are becoming more and more advanced. In order to ensure the safety of military equipment and combat personnel, and improve military combat effectiveness, various stealth methods must be used to improve stealth capabilities. In daily life, various electronic and electrical equipment provide high efficiency for social production. At the same time, the electromagnetic radiation generated by the equipment during work cannot be ignored. It has gradually affected our production and life, making human beings The electromagnetic environment in living space is deteriorating day by day. Many problems caused by electromagneti...

Claims

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Application Information

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IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 李季刘继鹏杨春晖张磊
Owner HARBIN INST OF TECH
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