气凝胶
材料科学
莫来石
兴奋剂
掺杂剂
热稳定性
复合材料
热导率
化学工程
陶瓷
光电子学
工程类
作者
Peng Fei,Jian Feng,Junzong Feng,Liangjun Li
摘要
Abstract The addition of foreign elements is considered as an effective method to improve the thermal stability of alumina aerogels at a higher temperature. However, the location and stabilizing mechanism of the foreign elements in the alumina aerogel have not been carefully studied. In this work, Si or La was introduced into the network of alumina aerogels through a sol‐gel strategy. The Si‐doped alumina aerogel maintained high surface area (92 m 2 /g) and pore volume (0.572 cm 3 /g) even at 1300°C. The dopants prevented α‐Al 2 O 3 transformation at elevated temperatures (1200°C–1300°C). The distribution of foreign ions and their stabilizing mechanism were discussed in detail. The doped alumina aerogels reinforced by mullite fiber felt, with quite low density and thermal conductivity, can be used as high‐temperature thermal insulations.
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