Preparation and Properties of Sintered Corundum at Low Temperatures with Nano-η-Al2O3 Powder

作者：LI Fengyou,ZHANG Ling,SU Xin,LI Yunlong,HAO Xu

摘要：In order to reduce the sintering temperature and improve the properties of sintered corundum,corundum specimens were prepared by granulation and sintering with nano-η-A l203 as the raw material and polyvinyl alcohol as the binder.The effects of different sintering temperatures(1550,1600,1650 and 1700℃)and holding time(2,4 and 6 h)on the properties and microstructures of the specimens were studied,and the transformation mechanism ofη-Al203 was analyzed.The results show that dense sintered corundum with bulk density of 3.74 g/cm^3 and apparent porosity of 1.77%is obtained by calcinating at 1650℃for 6 h;the phase transition fromη-Al203 toα-Al203 occurs first on the surface of alumina particles and then diffuses rapidly to the interior;at lower sintering temperatures there is no abnormal growth of crystals,the bonding between the grains is tight,transgranular fracture is the main fracture mode,there are fewer intergranular pores,and the grain size is in the range of 3.5-7.5μm.

发文机构：School of High Temperature Materials and Magnesium Resource Engineering Research Institute of Refractories.Yingkou Qinghua Group

关键词：nano-η-aluminalowTEMPERATURESsinteredCORUNDUMproperties

分类号： TQ1[化学工程]