Experimental Characterization of the Thermal Conductivity and Microstructure of Opacifier-Fiber-Aerogel Composite.

Experimental Characterization of the Thermal Conductivity and Microstructure of Opacifier-Fiber-Aerogel Composite.
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遮光剂-纤维-气凝胶复合材料的导热性和微观结构的实验表征

DOI:
10.3390/molecules23092198
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发表时间:
2018-08-30
期刊:
Molecules (Basel, Switzerland)
影响因子:
--
通讯作者:
Tao W
Tao W
中科院分区:
其他
文献类型:
--
作者:
Zhang H;Zhang C;Ji W;Wang X;Li Y;Tao W

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气凝胶材料具有高孔隙率、纳米孔结构和孔隙,具有极低的热导率,在隔热领域具有广阔的应用前景。二氧化硅气凝胶材料由于其低导热性和耐高温性而被广泛使用。纯二氧化硅气凝胶非常易碎,对3-8 μm的红外光谱几乎透明。掺杂纤维和遮光剂可以克服这些缺点。采用瞬态平面热源法,研究了遮光剂种类和含量对石英纤维毡-气凝胶复合材料导热系数的影响。在100 ~ 750 °C温度范围内,在氮气气氛下,对纯纤维毡、纤维毡-气凝胶、20%SiC-纤维毡-气凝胶、30%ZrO_2-纤维毡-气凝胶和20%SiC +30%ZrO_2-纤维毡-气凝胶的绝热性能进行了比较。掺杂20%SiC的纤维毡-气凝胶在750 °C时的热导率最低,为0.0792W/m·K,说明合适的遮光剂种类和适量的遮光剂含量是导致纤维毡-气凝胶热导率低的主要原因。孔径分布表明,微孔和中孔的体积分数也是降低多孔材料热导率的关键因素。
Due to their high-porosity, nanoporous structure and pores, aerogel materials possess extremely low thermal conductivity and have broad potential in the thermal insulation field. Silica aerogel materials are widely used because of their low thermal conductivity and high temperature resistance. Pure silica aerogel is very fragile and nearly transparent to the infrared spectrum within 3–8 μm. Doping fibers and opacifiers can overcome these drawbacks. In this paper, the influences of opacifier type and content on the thermal conductivity of silica fiber mat-aerogel composite are experimentally studied using the transient plane source method. The thermal insulation performances are compared from 100 to 750 °C at constant pressure in nitrogen atmosphere among pure fiber mat, fiber mat-aerogel, 20% SiC-fiber mat-aerogel, 30% ZrO2-fiber mat-aerogel and 20% SiC + 30% ZrO2-fiber mat-aerogel. Fiber mat-aerogel doped with 20% SiC has the lowest thermal conductivity, 0.0792 W/m·K at 750 °C, which proves that the proper type and moderate content of opacifier dominates the low thermal conductivity. The pore size distribution indicates that the volume fraction of the micropore and mesopore is also the key factor for reducing the thermal conductivity of porous materials.
通过超临界二氧化碳干燥制备的水可提取阿拉伯素气凝剂。
DOI: 10.3390/molecules18055531
发表时间: 2013-05-14
期刊: Molecules (Basel, Switzerland)
影响因子: --
作者:
Marquez-Escalante J;Carvajal-Millan E;Miki-Yoshida M;Alvarez-Contreras L;Toledo-Guillén AR;Lizardi-Mendoza J;Rascón-Chu A
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DOI: 10.1016/j.ijheatmasstransfer.2011.02.026
发表时间: 2011-05-01
影响因子: 5.2
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