Enhanced high-temperature dielectric properties and microwave absorption of SiC nanofibers modified Si3N4 ceramics within the gigahertz range

摘要: Abstract Si3N4 ceramics modified with SiC nanofibers were prepared by gel casting aiming to enhance the dielectric and microwave absorption properties at temperatures ranging from 25 °C 800 °C within X-band (8.2–12.4 GHz). The results indicate that complex permittivity loss are significantly increased weight fraction of in ceramics. Meanwhile, both obviously temperature-dependent, increase higher test temperatures. Increased charges mobility along conducting paths made self-interconnected together multi-scale net-shaped structure composed nanofibers, grains micro-pores main reason for these enhancements properties. Moreover, calculated demonstrates much enhanced attenuation abilities can be achieved ceramics, temperature has positive effects on performance. will promising candidates as absorbing materials high-temperature applications.