SiC/PyC nanowire reinforced Al2O3 high-temperature-resistant wave-absorbing ceramic and preparation method thereof

Abstract

The SiC/PyC nanowire reinforced Al2O3 high-temperature-resistant wave-absorbing ceramic is composed of an Al2O3 porous ceramic matrix, a graphene interface and SiC/PyC nanowires, the Al2O3 porous ceramic is adopted as the matrix, the graphene interface and the SiC/PyC nanowires are deposited on a framework of the Al2O3 porous ceramic to form a porous structure type wave-absorbing material, and the SiC/PyC nanowire reinforced Al2O3 high-temperature-resistant wave-absorbing ceramic has the characteristics of light weight and high strength, can stably serve in a high-temperature environment, and can be used as a high-temperature-resistant wave-absorbing material. The high-temperature wave-absorbing composite material has the advantages that high-temperature wave-absorbing characteristic application is achieved, electromagnetic parameters of the composite material are optimized due to introduction of the graphene interface and the SiC/PyC nanowires, good impedance matching and attenuation coefficients can be obtained, and accordingly excellent wave-absorbing performance is obtained. Besides, Al2O3 porous ceramic is used for providing a porous structure, a graphene interface and SiC/PyC nanowires are introduced through a chemical vapor deposition method, the interface bonding force is high, the chemical purity is high, the preparation process is good in repeatability, and a new thought can be provided for large-scale production of the three-dimensional structure composite wave-absorbing material.

Description

technical field [0001] The patent of the present invention relates to a wave-absorbing ceramic, in particular to a SiC / PyC nanowire-reinforced Al 2 o 3 High temperature resistant wave-absorbing ceramics can be used for long-term service in high-temperature complex environments. Background technique [0002] Absorbing material refers to a type of material that can absorb and attenuate incident electromagnetic wave energy, convert its electromagnetic energy into heat energy or dissipate other forms of energy, thereby reducing electromagnetic wave reflection or transmission. Most magnetic materials are limited by the Curie temperature and can only provide stable absorbing properties at relatively low temperatures. When the ambient temperature rises to a certain level, the magnetic loss function disappears. Therefore, the dielectric loss absorbing material has become an inevitable choice for high temperature absorbing materials. According to their molding process and bearing...

AI Technical Summary

Problems solved by technology

[0007] As shown in the above-mentioned patents, a microwave-absorbing ceramic material is disclosed, but there are few introductions to the integrated molding preparation of wave-absorbing ceramics and the application in high-temperature environments, which limits the further application of high-temperature wave-absorbing ceramics