Preparation of foam ceramics from solid wastes: A study on the relationship between firing regime and properties by grey system theory
Preparation of foam ceramics from solid wastes: A study on the relationship between firing regime and properties by grey system theory
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DOI：
10.1016/j.jmrt.2023.07.164
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发表时间：
2023-07
期刊：
影响因子：
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通讯作者：
Jianye Liang;Zijuan Tang;Fang Qi;Weihui Jiang;Xinbin Lao;L. Miao;Huidong Tang;Jianmin Liu;Z. Bao
中科院分区：
文献类型：
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作者：
Jianye Liang;Zijuan Tang;Fang Qi;Weihui Jiang;Xinbin Lao;L. Miao;Huidong Tang;Jianmin Liu;Z. Bao
以80 wt.%砂页岩、8 wt.%粉煤灰、8 wt.%钢渣和4 wt.%菱镁矿为原料，0.3 wt.% SiC为发泡剂制备泡沫陶瓷。研究了烧成温度和保温时间对泡沫陶瓷性能和物相的影响。采用灰色系统理论探讨孔隙结构参数与导热系数之间的相关性。 1160℃烧结50min的泡沫陶瓷表现出最佳的综合性能：容重0.651g/cm3，弯曲强度4.75MPa，总孔隙率73.58%，闭孔率54.16%，导热系数0.081W/(m·K)。 Micro-CT结果表明，平均孔容为1.083 mm3的孔隙相对独立且均匀；孔壁厚度呈正态分布，有利于性能的提高。在孔结构参数中，分形维数与泡沫陶瓷导热系数的相关性最大。
Foam ceramics were prepared by using 80 wt.% sand shale, 8 wt.% coal fly ash, 8 wt.% steel slag and 4 wt.% magnesite as raw materials and 0.3 wt.% SiC as foam agent. Effects of firing temperature and holding time on performance and phases of foam ceramics were investigated. Grey system theory was used to explore the correlation between pore structure parameters and thermal conductivity. The foam ceramics sintered at 1160 °C for 50 min exhibit the optimal comprehensive properties: bulk density of 0.651 g/cm3, flexural strength of 4.75 MPa, total porosity of 73.58%, closed porosity of 54.16%, and thermal conductivity of 0.081 W/(m·K). The Micro-CT results show that the pores with the average pore volume of 1.083 mm3are relatively independent and uniform; and the pore wall thickness presents a normal distribution, which is conducive to improving the properties. Among the pore structure parameters, the fractal dimension has the greatest correlation with the thermal conductivity of foam ceramics.