关键词: 红柱石, 莫来石化, 刚玉-莫来石, 抗蠕变性, 荷重软化温度

Abstract: Corundum-mullite materials were prepared with homogeneous bauxite chamotte,andalusite fine powder,Guangxi white clay as raw materials firing at 1 400 ℃ for 4 h.The effect of the andalusite fine powder addition (0,5%,10%,and 15%,by mass) on their properties such as the density,the strength,the refractoriness under load,the thermal shock resistance,the hot creep resistance was studied.The results show that:(1)with the increase of the andalusite fine powder addition,the bulk density of the samples gradually decreases,the thermal shock resistance and the hot creep resistance gradually enhance,the refractoriness under load gradually rises,and the cold crushing strength basically remains unchanged;the sample added with 15% of andalusite has the best comprehensive performance;(2)after firing at 1 400 ℃ for 4 h,the surface layer of andalusite fine powder particles shows complete mullitization,and the mullitization degree gradually decreases from the surface to the inside,which enables further mullitization during subsequent high-temperature heating,thus playing a positive role to the thermal shock resistance,the hot creep resistance and the refractoriness under load of the materials.

Key words: andalusite, mullitization, corundum-mullite, creep resistance, refractoriness under load