材料科学
气凝胶
复合材料
保温
氮化硼
热导率
抗压强度
微观结构
复合数
溶胶凝胶
脆性
陶瓷
热稳定性
热的
化学工程
图层(电子)
纳米技术
气象学
物理
作者
Haixia Yang,Chunming Li,Xiandong Yue,Jianchun Huo,Feng Ye,Jingxiao Liu,Fei Shi,Jie Ma
标识
DOI:10.1016/j.matdes.2019.108217
摘要
Although pure silicon oxycarbide (SiOC) aerogels have unique properties of low density and high temperature resistance, they are still difficult to apply at a large scale due to brittleness. To overcome this drawback, a strong boron nitride/silicon oxycarbide (BN/SiOC) aerogel composite with high-temperature resistance and thermal insulation was prepared by the sol-gel method and pyrolysis of the precursor aerogel. The microstructural, mechanical and thermal insulation properties of the composites were investigated, and the effect of the BN content on the microstructure and properties was also clarified. The results indicate that the obtained mesoporous composites exhibit low thermal conductivity (0.04–0.20 Wm−1 K−1) and high-temperature resistance (∼1300 °C). As the BN content increased from 0 to 15 vol %, the compressive strength of the composites increased from 2.2 to 20.3 MPa. The obtained composites exhibit considerable promise in high-temperature thermal insulation applications.
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