材料科学
热解炭
气凝胶
陶瓷
联锁
碳纤维
弹性(材料科学)
涂层
纳米线
热稳定性
复合材料
纳米技术
保温
热解
化学工程
图层(电子)
复合数
机械工程
工程类
作者
Haotian Ni,De Lu,Lei Zhuang,Pengfei Guo,Liang Xu,Mingzhu Li,Wenhao Hu,Zhentao Ni,Lei Su,Kang Peng,Hongjie Wang
出处
期刊:ACS Nano
[American Chemical Society]
日期:2024-06-07
卷期号:18 (24): 15950-15957
标识
DOI:10.1021/acsnano.4c03816
摘要
Resilient ceramic aerogels with a unique combination of lightweight, good high-temperature stability, high specific area, and thermal insulation properties are known for their promising applications in various fields. However, the mechanical properties of traditional ceramic aerogels are often constrained by insufficient interlocking of the building blocks. Here, we report a strategy to largely increase the interlocking degree of the building blocks by depositing a pyrolytic carbon (PyC) coating onto Si3N4 nanowires. The results show that the mechanical performances of the Si3N4 nanowire aerogels are intricately linked to the microstructure of the PyC nodes. The compression resilience of the Si3N4@PyC nanowire aerogels increases with an increase of the interlayer cross-linking in PyC. Additionally, benefiting from the excellent high-temperature stability of PyC, the Si3N4@PyC nanowire aerogels demonstrate significantly superior in situ resilience up to 1400 °C. The integrated mechanical and high-temperature properties of the Si3N4@PyC nanowire aerogels make them highly appealing for applications in harsh conditions. The facile method of manipulating the microstructure of the nodes may offer a perspective for tailoring the mechanical properties of ceramic aerogels.
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