关键词: 粉煤灰漂珠, 颗粒堆积法, 多孔陶瓷材料, 分形维数, 力学性能

Abstract: In order to further expand the application of fly ash cenosphere in the field of porous ceramics,porous ceramics were prepared using fly ash cenosphere,forsterite,sericite powder and bauxite as main raw materials,molding,then heat treating at 1 100 ℃ for 1 h in air atmosphere.The fly ash cenosphere addition varied from 40%,60%,to 80%,by mass.The phase composition,microstructure and conventional physical properties of the porous ceramics were studied.The results show that:(1)with the increase of the fly ash cenosphere addition from 40% to 80%,the interval between fly ash cenosphere and the matrix increases,the porosity rises,the bulk density and the cold compressive strength decrease,but the fractal dimension of the pores does not change significantly;(2)with 60% addition of fly ash cenosphere,the comprehensive performance of the sample is optimal with about (0.90±0.01) g·cm^-3 of the bulk density,(66.9±0.5)% of the porosity,about ( 12.37±0.69) MPa of the cold compressive strength,and 0.201,0.232 and 0.262 W·m^-1·K^-1 of the thermal conductivity at 300,600 and 900 ℃.Therefore,it has a good application prospect in the field of thermal insulation refractories.

Key words: fly ash cenosphere, particle stacking method, porous ceramic material, fractal dimension, mechanical property