关键词: 莫来石溶胶;共沉淀法;高铝质耐火材料;烧结性能

Abstract: In order to improve the comprehensive properties of high alumina refractory , the preparation of high alumina refractories by using the mullite sol as a binder obtained by coprecipitation method .The phase composition, microstructure and property of mullite sol were characterized by X -ray diffraction and scanning electron microscopy.By examining the bulk density , apparent porosity, linear shrinkage rate and cold compression strength of high alumina refractories , the properties of mullite sol and the effect of mullite sol on the sintering property and thermal shock resistance of high -alumina refractories were mainly investigated.The results show that the specific surface area of mullite sol is 26.02 m 2 /g after firing at 1100 ℃, and the sol powders are completely converted into mullite after firing at 1300 ℃.The bulk density of high alumina refractories increases with the addition of mullite sol, and the apparent porosity decreased.The cold compression strength and thermal shock resistance of mullite sol bonded with high aluminum refractories is improved by the synergistic effect of mullite sol and Al 2 O3 crystal transformation.

Key words: mullite sol;coprecipitation;high alumina refractory;sintering property