Abstract: Nano-magnesia powder adhered with alumina precursor was prepared with nano-magnesia, aluminum sulfate and ammonium hydroxide by using co-precipitation method.The sintering properties at room temperature and thermal shock resistance of sintering specimens were investigated.Phase composition and the microstructure of specimens were studied by XRD and SEM methods.The effect of alumina precursor that served as sintering aid on sintering and thermal shock resistance of magnesia ceramic was studied.The results suggest that the specimens after alumina added formed magnesium aluminate spinel that increased the sintering properties, maximum bulk density is 3.48 g/cm3.There are amounts of micro-cracks and conglutination areas in the microstructure that are contributed to the thermal shock resistance to some degree.

Key words: Nano-magnesia powder adhered with alumina precursor was prepared with nano-magnesia, aluminum sulfate and ammonium hydroxide by using co-precipitation method.The sintering properties at room temperature and thermal shock resistance of sintering specimens were investigated.Phase composition and the microstructure of specimens were studied by XRD and SEM methods.The effect of alumina precursor that served as sintering aid on sintering and thermal shock resistance of magnesia ceramic was studied.The results suggest that the specimens after alumina added formed magnesium aluminate spinel that increased the sintering properties, maximum bulk density is 3.48 g/cm3.There are amounts of micro-cracks and conglutination areas in the microstructure that are contributed to the thermal shock resistance to some degree.