Fibrous porous mullite ceramics modified by mullite whiskers for thermal insulation and sound absorption. Issue 2 (February 2023)

• Record Type: Journal Article
• Authors: Yang, Feiyue; Zhao, Shuang; Sun, Wencai; Li, Kunfeng; Chen, Jun; Fei, Zhifang; Yang, Zichun
• Is Part Of: Journal of the European Ceramic Society. Volume 43:Issue 2(2023)
• Page Start: 521
• Page End: 529
• Publication Date: 2023-02
• Subjects: Fibrous porous mullite ceramics -- Mullite whiskers -- Compressive strength -- Thermal conductivity -- Low-to-medium frequency sound absorption; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2022.10.025
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: In order to meet the demand for thermal insulation and sound absorption, fibrous porous mullite ceramics (FPMC) with high porosity and an interconnected pore structure were prepared, followed by a pore structure modification with in situ grown mullite whiskers on the three-dimensional framework of the FPMC. The resultant hierarchical material exhibited superior sound absorption performance in the low-to-medium frequency to most reported sound-absorbing materials, as well as a sufficient compressive strength of 1.26 MPa with low thermal conductivity of 0.117 W·m −1 ·K −1 . Moreover, the effects of solid content and mullite whiskers on the microstructure and physical properties of the material were analyzed. The increase of solid content led to increased compressive strength and thermal conductivity and decreased frequency corresponding to the first sound absorption peak. The thermal conductivity and compressive strength of the material increased as the mullite whiskers grew, while the median pore size decreased.