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SiCN ceramic wave-absorbing agent and preparation method thereof
The invention discloses a SiCN ceramic wave-absorbing agent and a preparation method thereof, and belongs to the field of wave-absorbing materials. The preparation method comprises the following steps: synthesizing ZIF-67, crosslinking the ZIF-67 with a polysilazane precursor, and pyrolyzing in the atmosphere of nitrogen, helium and argon to obtain the ZIF-67/SiCN ceramic wave-absorbing agent. The introduction of ZIF-67 effectively reduces the crystallization temperature of the polymer converted ceramic, promotes the in-situ generation of silicon carbide, silicon nitride, crystalline carbon and other nanocrystal phases in the ceramic internal microstructure, forms metal silicide and other high dielectric nanophases, and forms a multi-phase hierarchical microstructure in the ceramic. The low-dielectric PDC-SiCN can serve as a good base material, electromagnetic waves can enter the material easily, and multi-heterogeneous interface polarization, dipole polarization and improvement of conduction loss capacity can be achieved due to the existence of the nanocrystalline phase and the disordered layer carbon in the SiCN ceramic matrix. The SiCN ceramic wave-absorbing agent prepared by the preparation method disclosed by the invention can simultaneously give consideration to broadband effective absorption under an ultra-low thickness and ultra-low reflection loss under a low frequency, and a new thought is provided for development of a high-performance ceramic wave-absorbing material.
本发明公开了一种SiCN陶瓷吸波剂及其制备方法，属于吸波材料领域。通过合成ZIF‑67，将其与聚硅氮烷前驱体进行交联，并在氮气、氦气、氩气氛围下热解得到ZIF‑67/SiCN陶瓷吸波剂。ZIF‑67的引入有效降低聚合物转化陶瓷的结晶温度，在促进陶瓷内部微结构原位生成碳化硅、氮化硅和结晶碳等纳米结晶相的同时，会形成金属硅化物等其他的高介电纳米相，在陶瓷内部形成多相层次微结构。低介电的PDC‑SiCN可以作为良好的基材有利于电磁波进入材料内部，而SiCN陶瓷基体中纳米晶相和乱层碳的存在可以实现多异质界面极化、偶极极化和传导损耗能力的提高。本发明制得的SiCN陶瓷吸波剂可以同时兼顾在超低厚度下的宽频有效吸收和低频下的超低反射损耗，为高性能陶瓷吸波材料的研制提供了新思路。
SiCN ceramic wave-absorbing agent and preparation method thereof
The invention discloses a SiCN ceramic wave-absorbing agent and a preparation method thereof, and belongs to the field of wave-absorbing materials. The preparation method comprises the following steps: synthesizing ZIF-67, crosslinking the ZIF-67 with a polysilazane precursor, and pyrolyzing in the atmosphere of nitrogen, helium and argon to obtain the ZIF-67/SiCN ceramic wave-absorbing agent. The introduction of ZIF-67 effectively reduces the crystallization temperature of the polymer converted ceramic, promotes the in-situ generation of silicon carbide, silicon nitride, crystalline carbon and other nanocrystal phases in the ceramic internal microstructure, forms metal silicide and other high dielectric nanophases, and forms a multi-phase hierarchical microstructure in the ceramic. The low-dielectric PDC-SiCN can serve as a good base material, electromagnetic waves can enter the material easily, and multi-heterogeneous interface polarization, dipole polarization and improvement of conduction loss capacity can be achieved due to the existence of the nanocrystalline phase and the disordered layer carbon in the SiCN ceramic matrix. The SiCN ceramic wave-absorbing agent prepared by the preparation method disclosed by the invention can simultaneously give consideration to broadband effective absorption under an ultra-low thickness and ultra-low reflection loss under a low frequency, and a new thought is provided for development of a high-performance ceramic wave-absorbing material.
本发明公开了一种SiCN陶瓷吸波剂及其制备方法，属于吸波材料领域。通过合成ZIF‑67，将其与聚硅氮烷前驱体进行交联，并在氮气、氦气、氩气氛围下热解得到ZIF‑67/SiCN陶瓷吸波剂。ZIF‑67的引入有效降低聚合物转化陶瓷的结晶温度，在促进陶瓷内部微结构原位生成碳化硅、氮化硅和结晶碳等纳米结晶相的同时，会形成金属硅化物等其他的高介电纳米相，在陶瓷内部形成多相层次微结构。低介电的PDC‑SiCN可以作为良好的基材有利于电磁波进入材料内部，而SiCN陶瓷基体中纳米晶相和乱层碳的存在可以实现多异质界面极化、偶极极化和传导损耗能力的提高。本发明制得的SiCN陶瓷吸波剂可以同时兼顾在超低厚度下的宽频有效吸收和低频下的超低反射损耗，为高性能陶瓷吸波材料的研制提供了新思路。
SiCN ceramic wave-absorbing agent and preparation method thereof
一种SiCN陶瓷吸波剂及其制备方法
GENG TAOBO (Autor:in) / HUANG XIAOGU (Autor:in) / SHAO GAOFENG (Autor:in) / YU GAOYUAN (Autor:in)
07.03.2023
Patent
Elektronische Ressource
Chinesisch
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