A novel synthesis approach of Si2N2O based wave-transparent ceramics combined with a gel-casting process.

Autor: Mao, Fuzhou, Yin, Ruiming, Li, Pengfei, Bai, Yunfei, Liu, Bihui, Xiao, Yicheng, Gao, Zhen, Li, Longtao
Zdroj: Journal of Sol-Gel Science & Technology; Sep2023, Vol. 107 Issue 3, p733-741, 9p
Abstrakt: This study proposed a novel synthesis approach of Si2N2O based ceramics for radome with excellent wave-transparent and mechanical properties combined with a gel-casting process. The phase composition, morphology, mechanical and dielectric properties of as-prepared samples were investigated in detail, and the wave-transparent mechanism was simulated and calculated. Results indicated that by introducing equal mole of SiO into Si3N4, the composites with Si2N2O as the main crystalline phase were formed at a lower sintering temperature. The density was 2.57 g/cm3 with the flexural strength, fracture toughness and Vickers hardness of 140.2 MPa, 1.57 MPa m1/2, and 462.4 HV, respectively. The optimal dielectric constant and dielectric loss were 3.90 and 4.83 × 10−3 respectively, showing excellent wave-transparent performance. The increased dielectric loss was mainly attributed to the enhanced interfacial polarization by an excess addition of SiO. This work suggests that the simultaneous improvement of mechanical and dielectric properties can be achieved by regulating component of Si2N2O matrix ceramics. Highlights: A novel synthesis approach of Si2N2O matrix ceramics. The simultaneous improvement of mechanical and dielectric properties. The optimal dielectric constant and dielectric loss were 3.90 and 4.83 × 10−3. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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