A high-temperature structural and wave-absorbing SiC fiber reinforced Si3N4 matrix composites. Issue 6 (15th March 2021)

• Record Type: Journal Article
• Authors: Mo, Ran; Ye, Fang; Liu, Xiaofei; Zhou, Qian; Fan, Xiaomeng; Xue, Jimei; Zhang, Pengfei; Zhang, Litong; Cheng, Laifei
• Is Part Of: Ceramics international. Volume 47:Issue 6(2021)
• Page Start: 8191
• Page End: 8199
• Publication Date: 2021-03-15
• Subjects: Electromagnetic absorbing properties -- Mechanical properties -- Ceramic matrix composites -- Multiscale design; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.11.177
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The SiCf /Si3 N4 composite with low–high–low permittivity sandwich structure was designed for high-temperature electromagnetic (EM) wave absorption and mechanical stability. The SiCf /Si3 N4 possessed the remarkable mechanical properties at room temperature (the flexural strength is 357 ± 16 MPa and the fracture toughness is 10.8 ± 1.7 MPa m 1/2 ) for the strong fiber strength, moderate interface bonding strength and uniform matrix. Furthermore, the retention rate is as high as 80% at 800 °C. The A/B/C nanostructure and the sandwich meta-structure endowed the SiCf /Si3 N4 with an excellent EM absorbing property at room temperature. The SiCf /Si3 N4 still absorbed 75% of the incident EM waves energy in X and Ku bands when the temperature increases up to 600 °C, which is only 6% lower than that at room temperature, for the partial compensation of the decreased interfacial polarization loss for the increased conductivity loss and dipole polarization loss.