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

A nanowire and high-temperature-resistant technology, applied in the field of wave-absorbing ceramics, can solve the problems of limiting the application of high-temperature wave-absorbing ceramics, the integrated molding preparation of wave-absorbing ceramics, and the introduction of high-temperature environment applications, etc., to achieve excellent wave-absorbing performance, interface Strong combination and optimized electromagnetic parameters

Inactive Publication Date: 2022-03-18
王云
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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

Method used

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Embodiment 1

[0019] A SiC / PyC Nanowire Reinforced Al 2 o 3 High temperature resistant microwave absorbing ceramics, made of Al 2 o 3 Porous ceramic matrix, graphene interface and SiC / PyC nanowires, characterized by Al 2 o 3 The porous ceramic matrix is ​​an open-pore continuous structure with a bulk density of 3.5g / cm 3 , with an average pore size of 10 μm and a porosity of 95%; the graphene interface was deposited on Al by vacuum chemical vapor deposition 2 o 3 Prepared on the surface of the porous ceramic matrix skeleton, the reaction source gases are methane, hydrogen and argon, the gas flow ratio is 40:90:800sccm, the deposition time is 1.5h, and the thickness of the graphene interface is 8nm; SiC / PyC nanowires are passed through chemical vapor phase Infiltration method in Al 2 o 3 Porous ceramic substrate pores are prepared, the reaction source gas is trichloromethylsilane, hydrogen and argon, the gas flow ratio is 8:60:80sccm, the deposition time is 6h, SiC nanowires are depo...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/10C04B38/00
CPCC04B35/80C04B35/10C04B38/0003C04B2235/5244C04B2235/5264C04B38/0067C04B38/0054C04B38/0074
Inventor 王云
Owner 王云
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