Mechanical and Microwave-Absorption Properties of Si3N4 Ceramic with SiCNFs Fillers
Mechanical and Microwave-Absorption Properties of Si3N4 Ceramic with SiCNFs Fillers
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含 SiCNF 填料的 Si3N4 陶瓷的机械和微波吸收性能
DOI：
10.1002/adem.201800665
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发表时间：
2019
影响因子：
3.6
通讯作者：
Yang Li
中科院分区：
文献类型：
--
作者：
Wei Zhou;Lan Long;Guobin Bu;Yang Li
为了优化Si 3 N4陶瓷的力学性能和微波吸收性能，采用凝胶注模法在Si 3 N4陶瓷中引入SiC纳米纤维。结果表明，随着SiCNFs在Si 3 N4基体中的质量分数从0增加到8%，Si 3 N4基陶瓷的弯曲强度从362 MPa降低到284.2 MPa，断裂韧性从3.4 MPa · m1/2增加到5.2 MPa · m1/2。此外，SiCNFs的加入显著提高了Si 3 N4陶瓷的复介电常数和介电损耗。微波吸收性能研究表明，SiCNFs的加入对Si 3 N4陶瓷的微波衰减性能有明显的增强作用。特别是SiCNFs含量为8wt%时，Si 3 N4陶瓷在较薄的厚度下表现出优异的微波吸收性能，表明其作为高性能微波吸收材料具有良好的应用前景。
Aiming to optimize the mechanical and microwave absorption properties of Si3N4ceramics, SiC nanofibers (SiCNFs) are introduced into Si3N4ceramics by gel casting. The results indicate that flexural strength of as‐prepared Si3N4‐based ceramics decreases from 362 to 284.2 MPa, while the fracture toughness increases from 3.4 to 5.2 MPa · m1/2, as the SiCNFs fillers in the Si3N4matrix increase from 0 to 8 wt%. Moreover, both complex permittivity and dielectric loss are significantly enhanced after introduction of SiCNFs fillers into Si3N4ceramics. The investigation of microwave absorption demonstrates that much enhanced microwave attenuation abilities is achieved in the Si3N4ceramics with different content of SiCNFs fillers. Especially, the Si3N4ceramics with 8 wt% SiCNFs fillers exhibit excellent microwave absorption properties at thin thickness, indicating favorable potential application as high‐performance microwave absorbing materials.