粉煤灰陶瓷墙地砖的制备工艺及性能研究

Investigation on the Manufacturing Process and Properties of Ceramic Wall Brick and Floor Tile with Fly Ash

以固体废弃物粉煤灰与K_2CO_3为主要原料,通过预烧处理得到活化的粉煤灰原料,分别在850℃、875℃、900℃、925℃、950℃度进行常压烧结,制备得到粉煤灰陶瓷墙地砖材料。利用XRD、SEM分别对其物相组成与微观结构进行测试,结合烧成样品的吸水率、体积密度、显微硬度随温度的变化规律,分析了烧结工艺对粉煤灰陶瓷墙地砖性能的影响。研究结果表明:随着烧结温度的升高,样品中液相含量明显增加,在液相流动的作用下,坯体内部的气孔逐渐被填充,固相颗粒被粘结在一起形成连续的整体,从而形成致密的瓷体结构,当烧结温度为925℃时,样品的吸水率达到最小值:0.07%,维氏硬度达到最大值:5.9 GPa。而保温时间的增加,液相流动与物质迁移更充分,导致KAlSiO_4晶粒尺寸增加,轮廓清晰,但并未对物相及其力学性能产生明显影响。

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.