Thermal-Conductivity Studies of Macro-porous Polymer-Derived SiOC Ceramics
Thermal-Conductivity Studies of Macro-porous Polymer-Derived SiOC Ceramics
复制标题
大孔聚合物衍生的 SiOC 陶瓷的热导率研究
DOI：
10.1007/s10765-013-1542-8
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发表时间：
2014-01-01
影响因子：
2.2
通讯作者：
Xu, C. H.
中科院分区：
文献类型：
--
作者：
Qiu, L.;Li, Y. M.;Xu, C. H.
采用基于独立传感器的方法，对由球形团块组成的三维网状大孔SiOC陶瓷结构进行了热表征。在室温下，大孔SiOC陶瓷的有效导热系数，包括空隙的影响，与氧化铝气凝胶或碳气凝胶相当。这些结果表明SiOC陶瓷作为一种高温绝热材料具有很大的前景。测量结果进一步表明，在相同条件下处理的SiOC系列的有效导热系数受到低固相体积分数的限制。对于在不同热解温度下加工的SiOC陶瓷，SiOC网络中相邻颗粒之间的接触条件是影响其有效导热系数的另一个关键因素。
A three-dimensional reticular macro-porous SiOC ceramics structure, made of spherical agglomerates, has been thermally characterized using a freestanding sensor-based method. The effective thermal conductivity of the macro-porous SiOC ceramics, including the effects of voids, is found to be to at room temperature, comparable with that of alumina aerogel or carbon aerogel. These results suggest that SiOC ceramics hold great promise as a thermal insulation material for use at high temperatures. The measured results further reveal that the effective thermal conductivity is limited by the low solid-phase volume fraction for the SiOC series processed at the same conditions. For SiOC ceramics processed under different pyrolysis temperatures, the contact condition between neighboring particles in the SiOC networks is another key factor influencing the effective thermal conductivity.