Structure and mechanical properties of HNTs/SiBCN ceramic hybrid aerogels
Structure and mechanical properties of HNTs/SiBCN ceramic hybrid aerogels
复制标题
HNTs/SiBCN陶瓷杂化气凝胶的结构与力学性能
DOI：
10.1016/j.ceramint.2020.12.032
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发表时间：
2020-12
影响因子：
5.2
通讯作者：
陈忠
中科院分区：
文献类型：
--
作者：
刘洪丽;张篮天;李婧;李洪彦;安国庆;李亚静;陈忠
SiBCN陶瓷气凝胶具有超高温稳定性、低密度和高隔热性等优异性能。该气凝胶在航空航天等领域具有较好的应用前景。然而，与无机气凝胶类似，SiBCN陶瓷气凝胶的低机械强度是其应用的主要限制。基于无机双网络增强原理，以PVA和HNTs为第一网络，SiBCN陶瓷气凝胶为第二网络，构建了HNTs/SiBCN双网络气凝胶。采用扫描电镜（SEM）、透射电镜（TEM）、X射线衍射（XRD）、比表面积分析仪和压力测试仪对复合材料的结构和力学性能进行了表征。与SiBCN陶瓷气凝胶相比，6 wt% HNTs-SiBCN陶瓷杂化气凝胶具有更好的微观性能（保持基本的多孔网络结构和结构稳定性）和力学性能，连续的HNTs第一网络能有效地传递应力载荷，提高SiBCN陶瓷气凝胶的强度。
SiBCN ceramic aerogels have excellent properties such as ultra-high temperature stability, low density and high thermal insulation. The aerogels have better potential applications in aerospace and other fields. However, similar to inorganic aerogels, the low mechanical strength of SiBCN ceramic aerogels are the main limitation of its application. Based on the principle of inorganic double network enhancement, the first network was constructed by PVA and HNTs, and HNTs/SiBCN dual network aerogels were constructed by SiBCN ceramic aerogels as the second network. The structure and mechanical properties were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), specific surface area analyzer and pressure tester. Compared with SiBCN ceramic aerogels, 6 wt% HNTs-SiBCN ceramic hybrid aerogels have better microscopic properties (maintaining basic porous network structure and structural stability) and mechanical properties.The continuous HNTs first network can effectively transfer the stress load and enhance the strength of SiBCN ceramic aerogels.
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