关键词: 粉煤灰陶瓷;真空烧结;致密化

Abstract: Fly ash architectural ceramic composites were prepared by vacuum hot-pressing sintering method with the solid waste fly ash as raw materials.The sintering temperature was 850 ℃,875℃,900℃,925 ℃and 950 ℃,respectively.In order to analyze the effects of different sintering temperatures on the properties of the ceramics,XRD and SEM techniques were used to determine the phase composition and microstructure of the samples.Water absorption,bulk density and hardness of the samples were also measured.The results show that, in the sintering process, the eutectic liquid phase increased as the sintered temperature increased, and the density increased furtherly.When the sintering temperature is 925 ℃,the crystal grain of the obtained ceramics is small with uniform distribution and the average size is 0.4-0.5 μm.The bulk density, water absorption and hardness are 2.62 g/cm3, 0.05% and 6.5 GPa,respectively.

Key words: fly ash ceramic;vacuum hot sintering;densification