Microstructural and mechanical characterization of fly ash cenosphere/metakaolin-based geopolymeric composites
Microstructural and mechanical characterization of fly ash cenosphere/metakaolin-based geopolymeric composites
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DOI：
10.1016/j.ceramint.2011.02.010
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发表时间：
2011-07-01
影响因子：
5.2
通讯作者：
Zhou, Yu
中科院分区：
文献类型：
--
作者：
Wang, Mei-Rong;Jia, De-Chang;Zhou, Yu
将粉煤灰空心球(FAC)/偏高岭土（MK）基地聚合物浆料添加到粉煤灰空心球(FAC)/偏高岭土（MK）基地聚合物中，制备了新型地聚合物复合材料。研究了FAC/ mk基地聚合物复合材料的微观结构、力学性能、导热性能和堆积密度。扫描电镜（SEM）和透射电镜（TEM）证实，FAC在碱性条件下没有溶解，但在地聚合物基质与FAC的界面周围发生了元素扩散。当FAC含量从15 vol.%增加到40 vol.%时，FAC/ mk基地聚合物复合材料的抗压强度、导热系数和体积密度呈单调下降趋势，在FAC含量从15 vol.%增加到40 vol.%时，其最小值分别为36.5 MPa、0.173 W m(-1) K-1 0.82 g cm（-3）。结果表明，FAC能有效降低FAC/ mk基地聚合物复合材料的导热系数和体积密度，但力学性能略有下降。40 vol.% FAC/ mk基地聚合物复合材料由于其低导热性和低密度，是一种很有前途的中温绝热材料。版权所有：Elsevier Ltd and Techna Group S.r.l。
Novel fly ash cenosphere (FAC)/metakaolin (MK)-based geopolymeric composites were prepared by adding FAC to the MK-based geopolymeric slurry. Microstructure, mechanical property, thermal conductivity, and bulk density of the FAC/MK-based geopolymeric composites were investigated. It was confirmed by the scanning electron microscope (SEM) and transmission electron microscopy (TEM) that the FAC did not dissolve in alkaline condition, but element diffusion took place around the interface between geopolymeric matrix and FAC. The compressive strength, thermal conductivity and bulk density of FAC/MK-based geopolymeric composites decreased monotonically with the increase of the FAC content from 15 vol.% to 40 vol.%, and the minimum values for the 40 vol.% FAC/MK-based geopolymeric composite reached 36.5 MPa, 0.173 W m(-1) K-1 0.82 g cm(-3), respectively, in the range of FAC content from 15 vol.% to 40 vol.%. The results showed that the FAC could lower thermal conductivity effectively and bulk density of FAC/MK-based geopolymeric composites at a cost of slight decrease of mechanical properties. The 40 vol.% FAC/MK-based geopolymeric composite was a promising candidate material for intermediate-temperature thermal insulation applications due to its low thermal conductivity and low density. Crown Copyright (C) 2011 Published by Elsevier Ltd and Techna Group S.r.l. All rights reserved.