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Porous lightweight temperature-insensitive wave-absorbing ceramic composite material as well as preparation method and application thereof
The invention discloses a porous lightweight temperature-insensitive wave-absorbing ceramic composite material as well as a preparation method and application thereof, and relates to the technical field of wave-absorbing materials. The composite material comprises CNF/CNT (carbon nanotube/carbon nanotube) foam and a ceramic matrix deposited in the CNF/CNT foam; the CNF/CNT foam with a porous structure is prepared by the following steps: preparing a carbon nanotube dispersion liquid from a carbon nanotube in a water phase under the dispersion action of nano cellulose fibers, and directionally freeze-drying the dispersion liquid as a raw material in a mold, so as to prepare the CNF/CNT foam with a porous structure; the ceramic matrix is silicon nitride or boron nitride. The ceramic can be easily introduced into the CNF/CNT foam through a chemical vapor infiltration (CVI) process, the original periodic microporous structure of the CNF/CNT foam is maintained, and the ceramic has the advantages of low density, good broadband wave-absorbing performance, low wave-absorbing performance temperature dependence, bearing capacity and the like.
本发明公开了一种多孔轻质温度不敏感吸波陶瓷复合材料及其制备方法和应用，涉及吸波材料技术领域。所述复合材料包括CNF/CNT泡沫，以及所述CNF/CNT泡沫中沉积的陶瓷基体；所述CNF/CNT泡沫是将碳纳米管在水相中，在纳米纤维素纤维的分散作用下，获得碳纳米管分散液，再将分散液为原材料在模具中定向冷冻干燥，而制备出具有多孔结构的CNF/CNT泡沫；所述陶瓷基体为氮化硅或氮化硼。本发明通过化学气相渗透（CVI）工艺可以很容易地将陶瓷引入到CNF/CNT泡沫中，且保持CNF/CNT泡沫原有的周期性微孔结构，具有密度低、宽频吸波性能好、吸波性能温度依赖性低兼具承载能力等优点。
Porous lightweight temperature-insensitive wave-absorbing ceramic composite material as well as preparation method and application thereof
The invention discloses a porous lightweight temperature-insensitive wave-absorbing ceramic composite material as well as a preparation method and application thereof, and relates to the technical field of wave-absorbing materials. The composite material comprises CNF/CNT (carbon nanotube/carbon nanotube) foam and a ceramic matrix deposited in the CNF/CNT foam; the CNF/CNT foam with a porous structure is prepared by the following steps: preparing a carbon nanotube dispersion liquid from a carbon nanotube in a water phase under the dispersion action of nano cellulose fibers, and directionally freeze-drying the dispersion liquid as a raw material in a mold, so as to prepare the CNF/CNT foam with a porous structure; the ceramic matrix is silicon nitride or boron nitride. The ceramic can be easily introduced into the CNF/CNT foam through a chemical vapor infiltration (CVI) process, the original periodic microporous structure of the CNF/CNT foam is maintained, and the ceramic has the advantages of low density, good broadband wave-absorbing performance, low wave-absorbing performance temperature dependence, bearing capacity and the like.
本发明公开了一种多孔轻质温度不敏感吸波陶瓷复合材料及其制备方法和应用，涉及吸波材料技术领域。所述复合材料包括CNF/CNT泡沫，以及所述CNF/CNT泡沫中沉积的陶瓷基体；所述CNF/CNT泡沫是将碳纳米管在水相中，在纳米纤维素纤维的分散作用下，获得碳纳米管分散液，再将分散液为原材料在模具中定向冷冻干燥，而制备出具有多孔结构的CNF/CNT泡沫；所述陶瓷基体为氮化硅或氮化硼。本发明通过化学气相渗透（CVI）工艺可以很容易地将陶瓷引入到CNF/CNT泡沫中，且保持CNF/CNT泡沫原有的周期性微孔结构，具有密度低、宽频吸波性能好、吸波性能温度依赖性低兼具承载能力等优点。
Porous lightweight temperature-insensitive wave-absorbing ceramic composite material as well as preparation method and application thereof
一种多孔轻质温度不敏感吸波陶瓷复合材料及其制备方法和应用
XU HAILONG (author) / ZHAN HAOYANG (author) / FAN XIAOMENG (author)
2024-07-05
Patent
Electronic Resource
Chinese
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