关键词: 粉煤灰陶瓷墙地砖;制备工艺;液相烧结;力学性能

Abstract: Ceramic wall brick and floor tile with fly ash was prepared by traditional sintering method with the solid waste fly ash and K2CO3 as raw materials.The sintering temperature was 850 ℃, 875 ℃, 900℃, 925 ℃, 950 ℃, respectively.XRD and SEM techniques were used to investigate determine the phase composition and microstructure of the samples. Combined with the measurement of water absorption, bulk density and hardness of the samples, we analyzed the effects of sintering technology on the properties of this ceramic wall brick and floor tile.The results show that, the content of liquid phase increase as the sintering temperature increased, under the functions of liquid flowing, the pores in the green body are filled, the solid particles are bonded together to form a compact porcelain structure.The water absorption and microhardness is 0.07%and 5.9 Gpa, respectively, when the sintering temperature is 925℃.As the dwelling time increasing, the crystal size of KAlSiO4 increase due to the sufficient mass migration and liquid phase flow, while it hasn't any distinct impact on the phase composition and their mechanical properties.

Key words: ceramic wall brick and floor tile;manufacturing process;liquid-phase sintering;mechanical property