关键词: Sm2O3;莫来石;前驱体;烧结性能

Abstract: The sodium silicate and aluminum sulfate powder are used as raw material, adding different contents of samarium oxide, the ultrafine mullite precursor powder is obtained by sodium metasilicate nonahydrate and aluminium sulfate octadecahydrate.The influence of amarium oxide doping content on the sintering of mullite is studied by scanning electron microscopy(SEM)and X-ray diffraction(XRD). The experiment results indicate that when the addition amount of Sm 2O3is 4wt%, the synthesis temperature can be decreased from 1300 ℃to 1000 ℃,the grain size is about 39 nm,and the specific surface area is 95.265 m2/g.The sintering of mullite increases with the amarium oxide doping addition and the crystalline state of the powder is more complete;proper doping the rare earth element samarium can improve the microstructure,promote sintering and the formation of crystalline phases of mullite.

Key words: Sm2O3;mullite;precursor powder;sintering