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SiC-coated BN core-shell nanowire periodic array reinforced Si3N4 high-temperature wave-absorbing ceramic coating and preparation method thereof
The invention discloses a SiC-coated BN core-shell nanowire periodic array enhanced Si3N4 high-temperature wave-absorbing ceramic coating which is composed of SiC nanowires, a BN shell layer and a Si3N4 ceramic matrix, the SiC nanowires and the BN shell layer are obtained through a chemical vapor infiltration process and form a core-shell structure, SiC-coated BN core-shell nanowires are obtained, the dielectric constant of the SiC nanowires is improved while the SiC nanowires are prevented from being oxidized, and the wave-absorbing performance of the SiC nanowires is improved. The SiC-coated BN core-shell nanowires are arranged in a three-dimensional periodic array, the Si3N4 ceramic matrix is prepared by a chemical vapor infiltration process, and pores among the SiC-coated BN core-shell nanowires are uniformly filled with the Si3N4 ceramic matrix. Through a macro-micro multi-scale structure design, lattice distortion, stacking fault and interface defects are introduced at a micro scale, absorption attenuation loss of incident electromagnetic waves is promoted, regulation and control are carried out at a macro scale, a surface electric field coupling effect and a multiple scattering loss mechanism are introduced, an effective absorption frequency band is widened, and the absorption characteristic of the electromagnetic waves is cooperatively improved.
本发明公开了一种SiC@BN核壳纳米线周期阵列增强Si3N4高温吸波陶瓷涂层，由SiC纳米线、BN壳层、Si3N4陶瓷基体构成，所述的SiC纳米线和BN壳层通过化学气相渗透工艺得到，两者形成核壳结构，得到SiC@BN核壳纳米线，避免SiC纳米线氧化的同时改善SiC纳米线的介电常数，且SiC@BN核壳纳米线呈三维周期阵列排布，Si3N4陶瓷基体通过化学气相渗透工艺制得，Si3N4陶瓷基体在SiC@BN核壳纳米线之间的孔隙均匀填充。本发明通过宏微观多尺度结构设计，在微观尺度引入晶格畸变、堆垛层错及界面缺陷，促进入射电磁波的吸收衰减损耗，在宏观尺度进行调控，引入表面电场耦合效应及多重散射损耗机制，实现有效吸收频带的拓宽，协同提升电磁波吸收特性。
SiC-coated BN core-shell nanowire periodic array reinforced Si3N4 high-temperature wave-absorbing ceramic coating and preparation method thereof
The invention discloses a SiC-coated BN core-shell nanowire periodic array enhanced Si3N4 high-temperature wave-absorbing ceramic coating which is composed of SiC nanowires, a BN shell layer and a Si3N4 ceramic matrix, the SiC nanowires and the BN shell layer are obtained through a chemical vapor infiltration process and form a core-shell structure, SiC-coated BN core-shell nanowires are obtained, the dielectric constant of the SiC nanowires is improved while the SiC nanowires are prevented from being oxidized, and the wave-absorbing performance of the SiC nanowires is improved. The SiC-coated BN core-shell nanowires are arranged in a three-dimensional periodic array, the Si3N4 ceramic matrix is prepared by a chemical vapor infiltration process, and pores among the SiC-coated BN core-shell nanowires are uniformly filled with the Si3N4 ceramic matrix. Through a macro-micro multi-scale structure design, lattice distortion, stacking fault and interface defects are introduced at a micro scale, absorption attenuation loss of incident electromagnetic waves is promoted, regulation and control are carried out at a macro scale, a surface electric field coupling effect and a multiple scattering loss mechanism are introduced, an effective absorption frequency band is widened, and the absorption characteristic of the electromagnetic waves is cooperatively improved.
本发明公开了一种SiC@BN核壳纳米线周期阵列增强Si3N4高温吸波陶瓷涂层，由SiC纳米线、BN壳层、Si3N4陶瓷基体构成，所述的SiC纳米线和BN壳层通过化学气相渗透工艺得到，两者形成核壳结构，得到SiC@BN核壳纳米线，避免SiC纳米线氧化的同时改善SiC纳米线的介电常数，且SiC@BN核壳纳米线呈三维周期阵列排布，Si3N4陶瓷基体通过化学气相渗透工艺制得，Si3N4陶瓷基体在SiC@BN核壳纳米线之间的孔隙均匀填充。本发明通过宏微观多尺度结构设计，在微观尺度引入晶格畸变、堆垛层错及界面缺陷，促进入射电磁波的吸收衰减损耗，在宏观尺度进行调控，引入表面电场耦合效应及多重散射损耗机制，实现有效吸收频带的拓宽，协同提升电磁波吸收特性。
SiC-coated BN core-shell nanowire periodic array reinforced Si3N4 high-temperature wave-absorbing ceramic coating and preparation method thereof
一种SiC@BN核壳纳米线周期阵列增强Si3N4高温吸波陶瓷涂层及其制备方法
YE XINLI (author) / XU JIANQING (author) / CHEN YIJIE (author) / ZHANG JUNXIONG (author) / MA XIAOMIN (author) / MAO BANGXIAO (author) / ZHENG KAI (author)
2024-05-07
Patent
Electronic Resource
Chinese
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