摘要
本文重点研究了凝胶注模法制备多孔莫来石陶瓷的过程中固含量、表面活性剂量、搅拌速度等参数对多孔陶瓷显微结构的影响。结果表明,多孔陶瓷的气孔率、孔径尺寸和连通性可以通过控制制备过程参数来进行调节。当固含量从40wt%增加到70wt%,样品的开孔率和总气孔率分别从88.49%和91.27%降低到76.94%和83.04%,而密度从0.276 g·cm^(-3)增加到0.536 g·cm^(-3)。当表面活性剂浓度由0.25wt%增加到1wt%时,样品开孔率基本保持不变,总气孔率先由84.34%增加到93.26%,再减小到87.63%;密度则由0.413 g·cm^(-3)减小到0.378 g·cm^(-3),再增加到0.391 g·cm^(-3)。当搅拌速度由1000 r/min增加到1800 r/min时,开孔率由78.12%减小到72.85%,总气孔率则由79.95%先增加至84.18%,再减小到77.09%。
In this research,we investigated the influence of solid content,surfactant concentration and mixing speed on the microstructure of porous ceramics in the process of making porous mullite ceramics by gelcasting. The result revealed that the pore size and connectivity of the geopolymer foams could be efficiently adjusted by controlling some process parameters. With the increase of solid content from 40wt%to 70 wt%,the open porosityand total porosity decreased from 88. 49% and 91. 27% to 76. 94% and83. 04%,respectively. Also,thedensity increased from 0. 276 g·cm-（-3）to 0. 536 g·cm-（-3）. When the SDS concentration increased from 0. 25wt% to 1wt%,the open porosity of the sample remained unchanged,but the total porosity increased from 84. 34% to 93. 26% at first,and then decreased to 87. 63%. In the meantime,the density of the sample decreased from 0. 413 g·cm-（-3）to 0. 378 g·cm-（-3）at first,and then increased to 0. 391 g·cm-（-3）. When the stirring speed increased from 1000 r / min to 1800 r / min,the open porosity of the sample decreased from 78. 12% to 72. 85%. Simultaneously,the total porosity increased from 79. 95% to 84. 18% at first,and then decreased to 77. 09%.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2016年第4期1311-1317,共7页
Bulletin of the Chinese Ceramic Society
