Use method and preparation method of silicon carbide-based core-shell structure microwave absorbing material
A core-shell structure, silicon carbide-based technology, applied in the field of materials, can solve the problems of weak adhesive bonding, low processing efficiency, and difficult performance, and achieve the effect of shortening the curing time and increasing the movement rate
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Embodiment 1
[0041]According to a first aspect of an embodiment of the present invention, the embodiment provides a silicon carbide-based microwave absorbing material with a core-shell structure. The silicon carbide-based core-shell structure microwave absorbing material includes a first wave-absorbing layer and a second wave-absorbing layer; wherein, both the first wave-absorbing layer and the second wave-absorbing layer contain silicon carbide@carbon core-shell structure.
[0042] In this embodiment, the silicon carbide@carbon core-shell structure is a double-layer structure. The inner layer of the silicon carbide@carbon core-shell structure is a silicon carbide matrix layer, and the outer layer is a carbon matrix layer. The particle size of the silicon carbide@carbon core-shell structure is less than 200nm.
[0043] Such as figure 1 As shown, the silicon carbide@carbon core-shell structure is shown with the silicon carbide matrix layer as the core and covered with different carbon mat...
Embodiment 2
[0072] In this embodiment, the silicon carbide-based core-shell structure microwave absorbing material is used as in the first embodiment, and the method of using the silicon carbide-based core-shell structure microwave absorbing material is improved. Improved usage, such as Figure 4 shown, including the following steps:
[0073] B1, use dispersing aid to be coated on two wood board surfaces, make dispersing aid infiltrate to the deeper scope of fiber layer of wood board surface, wherein, dispersing aid is water or ethanol;
[0074]B2. Dry the water or ethanol in the fiber layer in B1, apply the first wave-absorbing layer containing the silicon carbide-based core-shell structure to the surfaces of the two wood boards, and infiltrate the fiber layer on the surface of the wood board with the dispersion medium agent in the first wave-absorbing layer , to guide the silicon carbide-based core-shell structure to be embedded into the fiber layer on the surface of the wood board;
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Embodiment 3
[0080] This embodiment improves the silicon carbide-based core-shell structure microwave absorbing material in the first embodiment. Such as Figure 5 As shown, it specifically includes the following steps:
[0081] C1. After mixing and stirring the silane coupling agent and the nano-silicon carbide powder, adjust the pH value at 9-11, and obtain the modified nano-silicon carbide powder after drying;
[0082] C2, heating the nano-silicon carbide powder to the temperature of carbon coating under the protection of argon and nitrogen;
[0083] C3. Introduce a reaction gas containing carbon source for chemical vapor deposition to obtain a dense silicon carbide@carbon core-shell structure.
[0084] In this embodiment, the silicon carbide in the silicon carbide@carbon core-shell structure in the first embodiment is chemically modified in advance. The silane coupling agent can form a chemical bond with the active group of the silicon carbide powder, and the silanol forms a hydroge...
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Abstract
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