Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8948437 | Ceramics International | 2018 | 35 Pages |
Abstract
Si3N4 porous ceramics with improved mechanical strength were fabricated for the first time by a combined foam-gelcasting and microwave-nitridation method at 1273-1373â¯K. The Si3N4 porous samples prepared at 1373â¯K/20â¯min with the porosity of 68.9% had respectively flexural and compressive strength as high as 8.1 and 20.8â¯MPa, which values were comparable or even superior to those of Si3N4 porous ceramics prepared previously by the conventional heating technique at a much higher temperature of 1773-1973â¯K, indicating that present preparation strategy is feasible to prepare high quality Si3N4 porous ceramic at a much milder condition. Moreover, the thermal conductivity of as-prepared Si3N4 porous ceramics at 1073â¯K was as low as 1.697â¯W/(mâ¯K), suggesting it could be a potentially good heat insulating material for aluminum electrolyte cells.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Lei Han, Faliang Li, Liang Huang, Haijun Zhang, Yuantao Pei, Longhao Dong, Jialian Zhang, Shaowei Zhang,