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.

中文翻译：

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泡沫-凝胶注模联合微波加热制备高强度多孔莫来石陶瓷

摘要 采用泡沫-凝胶浇铸和微波烧制相结合的方法，在 1373-1523 K 下加热 30 分钟，制备了机械强度提高的多孔莫来石陶瓷。在 1373 K 下制备的多孔莫来石含有 76.6% 的孔隙率，弯曲和压缩强度值分别高达 3.8 和 15.2 MPa。此外，其热导率仍低至 0.269 W/(m K)。这些值与之前通过常规加热在更高温度 (1573–1873 K) 下制备的多孔莫来石陶瓷相当甚至更好，表明使用微波加热代替常规加热更有益于制造高质量的多孔莫来石陶瓷在低得多的温度下。