Preparation of high strength porous mullite ceramics via combined foam-gelcasting and microwave heating. Issue 12 (15th August 2018)

• Record Type: Journal Article
• Authors: Han, Lei; Deng, Xiangong; Li, Faliang; Huang, Liang; Pei, Yuantao; Dong, Longhao; Li, Saisai; Jia, Quanli; Zhang, Haijun; Zhang, Shaowei
• Is Part Of: Ceramics international. Volume 44:Issue 12(2018)
• Page Start: 14728
• Page End: 14733
• Publication Date: 2018-08-15
• Subjects: Mullite -- Porous ceramics -- High strength -- Foam-gelcasting -- Microwave heating method; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.05.101
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Porous mullite ceramics with improved mechanical strength were fabricated by using a combined foam-gelcasting and microwave firing method at 1373–1523 K for 30 min. The porous mullite prepared at 1373 K contained 76.6% porosity, and exhibited flexural and compressive strength values as high as respectively 3.8 and 15.2 MPa. Moreover, its thermal conductivity still remained as low as 0.269 W/(m K). These values were comparable or even superior to those of porous mullite ceramics prepared previously via conventional heating at much higher temperatures (1573–1873 K), indicating that it is more beneficial to use microwave heating instead of conventional heating to make high quality porous mullite ceramics at a much lowered temperature.