| 纳米孔莫来石陶瓷材料的制备 | |
| Fabrication of Nanoporous Mullite Ceramics | |
| 摘要: 以正硅酸乙酯(TEOS)提供硅源、纳米氧化铝(d90=50 nm)提供铝源，通过溶胶-凝胶法与超临界干燥技术，制备了分散纳米氧化铝的SiO2气凝胶块体，所得复合气凝胶块体经1 200 ℃、1 300 ℃热处理后，得到了纳米孔莫来石陶瓷材料。XRD测试表明：凝胶体在1 200 ℃热处理后发生了莫来石化，1 300 ℃莫来石化基本完成。压汞仪与场发射扫描电镜结果显示：凝胶块体经1 200、1 300 ℃热处理后，形成了具有纳米多孔结构的莫来石陶瓷材料，其骨架结构包含有200~400 nm的大孔，以及大量位于其孔壁上的6~30 nm的介孔。由于莫来石化的进行，热处理后的陶瓷材料的纳米孔结构具有更高的热稳定性。 | |
| 关键词: 溶胶-凝胶 莫来石化 纳米孔 莫来石陶瓷 | |
| 基金项目: | |
| Abstract: The silica aerogels composited with alumina nano-particles were prepared by sol-gel method and supercritical drying technique, using TEOS and alumina nano-particles as the precursors. The nanoporous mullite materials were obtained by the calcination of the aerogel monoliths at 1 200 and 1 300 ℃, and were characterized by means of XRD, FESEM and mercury porosimetry. The results of XRD indicate that mullitization appears after calcination at 1 200 ℃. The results of mercury porosimetry and FESEM show that mullite ceramic materials possess porous microstructure with the pore size of 200~400 nm and 6~30 nm. Owing to the mullitization, the porous microstrcture of mullite ceramic materials has higher thermal stability. | |
| Keywords: Sol-Gel mullitization nanopore mullite ceramic | |
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| 王冬冬,王 刚,孙小飞,凌亚平,丁书强,李红霞.纳米孔莫来石陶瓷材料的制备[J].无机化学学报,2012,28(3):491-494. | |
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