Opacifier embedded and fiber reinforced alumina-based aerogel composites for ultra-high temperature thermal insulation
Opacifier embedded and fiber reinforced alumina-based aerogel composites for ultra-high temperature thermal insulation
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用于超高温隔热的嵌入遮光剂和纤维增强的氧化铝基气凝胶复合材料
DOI：
10.1016/j.ceramint.2018.09.223
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发表时间：
2019
影响因子：
5.2
通讯作者：
Jun Shen
中科院分区：
文献类型：
--
作者：
Wenbing Zou;Xiaodong Wang;Yu Wu;Liping Zou;Guoqing Zu;Dong Chen;Jun Shen
以琼脂和二氧化硅为粘结剂，采用冷冻干燥法将亚微米级TiO 2乳浊剂均匀分散到纤维增强体中。采用溶胶-凝胶法、浸渍法和超临界流体干燥法成功制备了具有高强度和优异高温隔热性能的TiO 2遮光剂/纤维/氧化铝基气凝胶（TFA）三元复合材料。研究了TFA复合材料的微观结构、力学性能和隔热性能。结果表明，莫来石纤维毡和SiO2粘结剂的加入可显著提高TFA复合材料的力学性能。研究了TiO 2乳浊剂在0 ~ 15wt%范围内对陶瓷高温导热性能的影响。所得TFA复合材料具有高达3.58 MPa的高杨氏模量和较低的高温热导率，800 °C时为0.129 W/m·K，1000 °C时为0.168 W/m·K。分析了TFA复合材料在高温下的传热机理。
A novel method was developed to uniformly disperse sub-micron TiO2opacifier into fiber reinforcements using agar and silica as binders via freeze drying. TiO2opacifier/ fiber/ alumina-based aerogel ternary (TFA) composites with high strength and excellent high-temperature thermal insulation were successfully prepared by sol-gel route, impregnation process and supercritical fluid drying. The microstructure, mechanical and thermal insulation properties of TFA composites were investigated comprehensively. The results show that the mechanical property of TFA composites can be significantly enhanced by mullite fiber felt and the incorporation of SiO2binder. The effect of TiO2opacifier on the high-temperature thermal conductivity was studied by adjusting the content of TiO2from 0 to 15 wt%. The obtained TFA composites exhibit high Young's modulus of up to 3.58 MPa and low high-temperature thermal conductivities of 0.129 W/m·K at 800 °C and 0.168 W/m·K at 1000 °C, respectively. The mechanism of heat transfer in TFA composites at high-temperature was also analyzed.
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DOI：
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发表时间：
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影响因子：
6.4
作者：
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发表时间：
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