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:
影响因子:
--
通讯作者:
Tao W
中科院分区:
文献类型:
--
作者:
Zhang H;Zhang C;Ji W;Wang X;Li Y;Tao W
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.
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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
通讯作者:
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发表时间:
2007-06-01
影响因子:
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通讯作者:
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DOI:
10.1016/j.ijheatmasstransfer.2013.04.053
发表时间:
2013-09-01
影响因子:
5.2
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通讯作者:
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影响因子:
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作者:
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DOI:
10.1016/j.ijheatmasstransfer.2011.02.026
发表时间:
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影响因子:
5.2
作者:
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通讯作者:
Du, Xiaoze