Study on the Preparation of Secondary Aluminium Ash Based Porous Mullite Ceramics
Secondary aluminium ash is rich in aluminium and can be used as an aluminium source in the preparation of mullite ceramic materi-als.In order to make comprehensive use of the secondary aluminium ash,the porous mullite ceramics were prepared by solid-phase sintering with the secondary aluminium ash after washing and roasting,activated silica powder,corn starch and PVA binding agent,the effects of the molar ratio of Al2O3 to SiO2,sintering temperature,and holding time on the properties of the specimens were investigated and analysed by XRD and SEM.The results show that the porous mullite ceramics with bulk density of 1.83 g/cm3,water absorption of 18.05%,apparent porosity of 32.94%,compressive strength of 18.46 MPa are prepared,and columnar mullite crystals are produced under the conditions of Al2O3 to SiO2 molar ratio of 1.8,temperature of 1 200℃,and holding time of 4 h,the comprehensive performance of the sample is better.
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