作　　者： ; ; (冯志源）;

机构地区： 中钢集团洛阳耐火材料研究院有限公司

出　　处： 《耐火材料》 2014年第6期439-442,共4页

摘　　要： 分别以Al2O3、MgO质量比为2．554、3．644和5．823的镁铝尖晶石粉71MA、78MA和85MA为主要原料，以聚合氯化铝和镁砂为凝胶体系，采用发泡法制备了尖晶石隔热材料，并研究了料浆性能及尖晶石隔热材料的性能和显微结构。结果表明：用上述3种粉制成的料浆71MA的黏度随时间的延长而增大，料浆78MA和85 MA的黏度随时间的延长而减小；随着尖晶石原料中Al2 O3含量的提高，1700℃烧后试样的显气孔率逐渐增大，体积密度、常温耐压强度和常温抗折强度逐渐减小，烧后线收缩率逐渐减小，烧后试样中的气孔形状变得不完整，孔壁结构逐渐疏松；综合考虑料浆性能和烧后试样的性能，富铝适度（Al2 O3质量分数76％～80％）的尖晶石原料较适宜采用本工艺来制备尖晶石隔热材料。 Magnesium aluminate spinel insulating materials were prepared by foaming process using mag-nesium aluminate spinel powders 71MA （mass ratio of Al2O3 MgO=2.554）,78MA （mass ratio of Al2O3 MgO=3.644）and 85MA （mass ratio of Al2O3 MgO=5.823）as starting materials,aluminium polychlorid and magnesia as gel system.Properties of the slurries,properties and microstructure of the developed in-sulating materials were researched.The results show that：（1）with stirring time prolonging,the viscosity of 71MA slurry increases,but that of 78MA or 85MA slurry decreases;（2）with Al2O3 content in spinel increas-ing,the apparent porosity of the developed insulating materials after fired at 1 700℃increases gradually,the bulk density,the cold crushing strength and the cold modulus of rupture decrease,the linear shrinkage rate decreases gradually,the pores become imperfect,and the pore walls become loose;（3）taking the properties of slurries and the fired insulating materials into condersiation,the Al2O3-rish spinel with suitable Al2O3 （76 mass%-80 mass%）is appropriate to prepare spinel insulating materials using this process.

关 键 词： 镁铝尖晶石 组成 发泡法 隔热材料

领　　域： [化学工程]