Abstract
The SiC fibers are essential for designing microwave absorption and mechanical properties of multifunctional composites. In this study, SiCf/SiC composites were fabricated by SLF, KD-II, and KD-S SiC fibers. The SLF fibers are composed by amorphous SiOC. The KD-II and KD-S fibers reveal higher crystallizations. The conductivity of SLF, KD-II, and KD-S SiC fibers are 0.0127, 1.184, and 0.1316 S/cm, respectively. The flexural strength of SLF, KD-II, and KD-S SiCf/SiC composites are 147.77, 322.57, and 248.16 MPa, respectively. With the thickness of 2.3 mm, the microwave absorption property of SLF SiCf/SiC composites is over − 25 dB in X band. Additionally, the effective absorption bandwidth (EAB) of SLF SiCf/SiC composites below − 10 dB reaches 3.72 GHz with the thickness of 2.7 mm. In contrast, the KD-II SiCf/SiC composites only reach − 3.6 dB in X band when the thickness varies from 2 to 2.9 mm. With the thickness of 2 mm, the microwave absorption property of KD-S SiCf/SiC composites is over − 9 dB. With the thickness of 2.2 mm, the EAB of KD-S SiCf/SiC composites below − 7 dB reaches 4.12 GHz. The mechanisms of mechanical, microwave absorption, and penitential applications for SiCf/SiC composites are also discussed.
Highlights
Nowadays, as the development of microwave technology, electromagnetic pollution usually appears in daily life
We systematically investigated the properties of SiC fibers and the effects of different SiC fibers on microwave absorption and mechanical properties of SiCf/SiC composites
The SiCf/SiC composites fabricated with SLF, KD-II and KD-S SiC fibers by precursor impregnation and pyrolysis (PIP) method have similar density and open porosity values
Summary
As the development of microwave technology, electromagnetic pollution usually appears in daily life. Continuous fiber reinforced ceramics matrix composites (CFRCMCs) were believed to be the most prospective multifunctional composites due to their high mechanical strength, stability under high temperature, low densities and oxidation resistance properties[8,9,10]. SiC fiber reinforced SiC ceramic matrix composites can be promising candidates of multifunctional materials with microwave absorption and mechanical properties. The microwave absorption and mechanical properties of SiC CFRCMCs depend on complex permittivity, electrical conductivity and free carbon content of SiC fibers, as well as interphase and matrix. The oxygen content of the second generation is lower than 2 wt% with enhanced limit temperature of about 1300 °C. The SLF, KD-II and KD-S SiC fibers are all produced in China and represent first, second and third generation of SiC fibers, respectively. We systematically investigated the properties of SiC fibers and the effects of different SiC fibers on microwave absorption and mechanical properties of SiCf/SiC composites
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of Materials Science: Materials in Electronics
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
