Ultrastrong, Superelastic, and Lamellar Multiarch Structured ZrO2-Al2O3 Nanofibrous Aerogels with High-Temperature Resistance over 1300 °C.
Ultrastrong, Superelastic, and Lamellar Multiarch Structured ZrO2-Al2O3 Nanofibrous Aerogels with High-Temperature Resistance over 1300 °C.
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DOI：
10.1021/acsnano.0c06423
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发表时间：
2020-10
期刊：
影响因子：
17.1
通讯作者：
Xinxin Zhang;Feiyan Wang;Lvye Dou;Xiaota Cheng;Y. Si;Jianyong Yu;B. Ding
中科院分区：
文献类型：
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作者：
Xinxin Zhang;Feiyan Wang;Lvye Dou;Xiaota Cheng;Y. Si;Jianyong Yu;B. Ding
先进的陶瓷气凝胶材料具有足够的机械坚固性和优异的耐高温性能，是恶劣环境下迫切需要的隔热材料。然而，陶瓷气凝胶材料的实际应用一直受到力学性能差和热冲击降解的限制。在这里，我们报告了通过将ZrO2-Al2O3纳米纤维与Al(H2PO4)3基质结合，可以轻松地制造出具有超强、超弹性和耐高温特性的层状多拱形结构陶瓷纳米纤维气凝胶。所得的ZrO2-Al2O3纳米纤维气凝胶具有从90%的应变下快速恢复、超过1100 kPa的高抗压强度（在90%的应变下）、高抗疲劳性和温度不变超弹性的综合性能。此外，陶瓷纳米纤维气凝胶的全陶瓷组分特性还使其具有高达1300℃的耐高温性能和低导热系数（0.0322 W m-1 K-1）的隔热性能。这些优越的性能使陶瓷气凝胶在极端条件下成为高温隔热材料的理想选择。
Advanced ceramic aerogel materials with a performance combining sufficient mechanical robustness and splendid high-temperature resistance are urgently needed as thermal insulators in harsh environments. However, the practical applications of ceramic aerogel materials are always limited by poor mechanical performance and degradation under thermal shock. Here, we report the facile creation of lamellar multiarch structured ceramic nanofibrous aerogels that are simultaneously ultrastrong, superelastic, and high temperature resistant by combining ZrO2-Al2O3 nanofibers with Al(H2PO4)3 matrices. The resulting ZrO2-Al2O3 nanofibrous aerogels exhibit the integrated properties of rapid recovery from a strain of 90%, high compression strength of more than 1100 kPa (at a strain of 90%), high fatigue resistance, and temperature-invariant superelasticity. Moreover, the all-ceramic component feature also provides the ceramic nanofibrous aerogels with high-temperature resistance up to 1300 °C and thermal insulation performance with low thermal conductivity (0.0322 W m-1 K-1). These superior performances make the ceramic aerogels ideal for high-temperature thermal insulation materials in extreme conditions.