Silicon carbide/hafnium carbide nanowire modified silicon carbide coating reinforced graphene honeycomb-based nano aerogel heat-insulating and wave-absorbing composite material

Abstract

The invention discloses a silicon carbide / hafnium carbide nanowire modified silicon carbide coating enhanced graphene honeycomb-based nano aerogel heat-insulating and wave-absorbing composite material, which is composed of silicon carbide coating enhanced graphene honeycomb, silicon carbide / hafnium carbide nanowires and nano aerogel, firstly, a silicon carbide coating is prepared on the surface of a graphene honeycomb through a chemical vapor deposition process, and then internal pores of the graphene honeycomb are reinforced on the silicon carbide coating through a chemical liquid vapor deposition process to prepare the silicon carbide / hafnium carbide nanowire. And finally, nano aerogel is prepared on the surfaces of the silicon carbide / hafnium carbide nanowires through a sol-gel process, a supercritical drying technology and a carbonization reaction, a formed three-dimensional network structure can effectively block heat transmission and promote the absorption and dissipation effects on electromagnetic waves, and the heat insulation and wave absorption performance of the composite material is cooperatively provided.

Description

technical field [0001] The patent of the present invention relates to a heat-insulating and wave-absorbing composite material, in particular to a silicon carbide / hafnium carbide nanowire-modified silicon carbide coating-reinforced graphene honeycomb-based nano-airgel heat-insulating and wave-absorbing composite material, which can be used at high temperatures Long-term service applications in complex environments. [0002] technical background [0003] Electromagnetic wave is the carrier on which modern information dissemination and reception depends. In terms of civilian use, with the development of electronic information technology, wireless electronic communication technology and related products based on electromagnetic wave emission, transmission and processing have developed rapidly and have been widely used. However, the resulting electromagnetic radiation and interference have become increasingly serious, becoming a new source of pollution that affects health and qual...

AI Technical Summary

Problems solved by technology

However, this invention is a one-dimensional nano-wave absorbing material, which does not have the structural advantages of a three-dimensional space network

[0009] As shown in the above-mentioned patents, in order to realize the preparation of high-temperature-resistant heat-insulating and wave-absorbing materials, silicon carbide materials are generally used as the main material for design, but it is difficult to effectively balance heat-insulating and wave-absorbing performances during the preparation process, and at the same time, the space structure The design is relatively simple and cannot achieve the expected goal