Preparation of Si3N4-BCxN-TiN composite ceramic aerogels via foam-gelcasting

Recently, high-performance ceramic aerogels (CAs) have become a research hotspot because of their multi-functional properties. Compared to their oxide counterparts, non-oxide CAs show better thermal shock resistance and other high-temperature properties, making them suitable for applications in hars...

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Bibliographic Details
Published inJournal of the European Ceramic Society Vol. 42; no. 6; pp. 2699 - 2706
Main Authors Han, Lei, Dong, Longhao, Li, Faliang, Duan, Hongjuan, Zhang, Haijun, Li, Guangqiang, Jia, Quanli, Zhang, Shaowei
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.06.2022
Subjects
Ceramic aerogels
Foam-gelcasting
High-performance
Non-oxide
Si3N4-BCxN-TiN
Ceramic aerogels
Non-oxide
Si3N4-BCxN-TiN
High-performance
Foam-gelcasting
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Summary:Recently, high-performance ceramic aerogels (CAs) have become a research hotspot because of their multi-functional properties. Compared to their oxide counterparts, non-oxide CAs show better thermal shock resistance and other high-temperature properties, making them suitable for applications in harsh environments. In this work, Si3N4-BCxN-TiN ceramic aerogels (SBCNT CAs) with molar ratios of B/C/Si/Ti = 2:1:5:5 were synthesized at 1623 K for 3 h via foam-gelcasting, from Si, Ti, melamine and boron acid raw materials. The prepared SBCNT CAs containing 91.0% porosity exhibited the highest compressive strength up to 1.0 MPa, and thermal conductivity of 0.144 W/(m·K) at 298 K. They also exhibited excellent service performance at 1473 K in Ar, demonstrating their great potential for high-temperature applications. [Display omitted]
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2022.01.059