Fabrication and characterization of mullite-whisker-reinforced lightweight porous materials with AlF3.3H2O
Fabrication and characterization of mullite-whisker-reinforced lightweight porous materials with AlF3.3H2O
复制标题
DOI：
10.1016/j.ceramint.2022.02.027
复制
发表时间：
2022-04-06
影响因子：
5.2
通讯作者：
Deng, Hailiang
中科院分区：
文献类型：
--
作者：
Deng, Xiangong;Ji, Peng;Deng, Hailiang
以粉煤灰和煅烧铝土矿为原料，AlF3.3H(2)O为添加剂，采用颗粒稳定法制备莫来石晶须增强轻质多孔材料。研究了AlF3.3H(2)O对莫来石晶须增强轻质多孔材料的物相组成、体积密度、孔隙率、微观结构、力学性能和导热系数的影响。随着AlF3.3H(2)O含量的增加，轻质多孔材料的线收缩率、体积密度、抗压强度、弯曲强度和导热系数增加，孔隙率降低。当AlF3.3H(2)O含量为9 wt%时,孔隙率为72.3%、平均晶须长度接近19.2 μm的轻质多孔材料样品的弯曲强度和压缩强度分别为17.8和31.0 MPa,导热系数保持在最小值0.092 W(m·K)(-1)。
Mullite-whisker-reinforced lightweight porous materials were fabricated by the particle stabilization method using fly ash and calcined bauxite as raw materials, and AlF3.3H(2)O as an additive. The effect of AlF3.3H(2)O on the phase composition, volume density, porosity, microstructure, mechanical performance, and heat conductivity of mullite-whisker-reinforced lightweight porous materials was explored. With an increase in the AlF3.3H(2)O con-tent, the linear shrinkage, volume density, compressive strength, flexural strength, and heat conductivity of lightweight porous materials increased and their porosity decreased. When the AlF3.3H(2)O content was 9 wt%, flexural and compressive strengths of lightweight porous material samples with a porosity of 72.3% and an average whisker length of similar to 19.2 mu m were 17.8 and 31.0 MPa, respectively, and the heat conductivity was maintained at a minimal value of 0.092 W (m K)(-1).