镁锆质耐火材料的性能研究  

Properties of MgO-ZrO_2 refractory

作　　者：聂建华[1] 王继宝[1] 曹锟[1] 梁永和[1] 吴芸芸[1] 高翔[1] 

机构地区：[1]武汉科技大学耐火材料与高温陶瓷国家重点实验室培育基地,湖北武汉430081

出　　处：《武汉科技大学学报》2008年第4期369-372,共4页Journal of Wuhan University of Science and Technology

基　　金：武汉市青年科技晨光计划项目(20065004116-37)

摘　　要：以电熔镁砂和锆英石为原料,研究锆英石质量分数和烧成温度对镁锆质试样物理性能的影响,利用X射线衍射、扫描电镜及能谱分析等手段对试样的物相组成和显微结构进行分析。结果表明,当锆英石质量分数为20%、烧成温度为1 650℃时,镁锆质试样具有最佳的物理性能;当锆英石质量分数超过20%,试样的物理性能和热震稳定性开始下降。试样的主要物相由t-ZrO2、方镁石和镁橄榄石组成,t-ZrO2晶粒与MgO晶粒交错分布,形成二相结构。MgO-ZrO2 samples were prepared by fused magnesia and zircon. The influence of zircon addition （12%, 15%, 20% and 23%） and sintering temperature （1 550, 1 600, 1 650 and 1 700 ℃） on the properties of MgO-ZrO2 samples were studied. Phase composition and microstructure of the samples were investigated by X ray diffractory, scanning electron microscopy and energy dispersive spectroscopy. It is found that MgO-ZrO2 samples have the optimal physical properties with 20% zircon and sintered at 1 650 ℃. When the zircon addition exceeds 20%, the physical properties and thermal shock resistance of the samples begin to decrease. Magnesia, t-zirconia and forsterite are observed in the samples, and zirconia grains are homogeneously distributed in the MgO matrix and form MgO- ZrO2 eutectic structure.

关 键 词：镁锆质耐火材料 锆英石 电熔镁砂 显微结构 

分 类 号：TQ175[化学工程—硅酸盐工业]