CAJ | 학술논문

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。
분별이Al2O3、MgO질량비위2．554、3．644화5．823적미려첨정석분71MA、78MA화85MA위주요원료，이취합록화려화미사위응효체계，채용발포법제비료첨정석격열재료，병연구료료장성능급첨정석격열재료적성능화현미결구。결과표명：용상술3충분제성적료장71MA적점도수시간적연장이증대，료장78MA화85 MA적점도수시간적연장이감소；수착첨정석원료중Al2 O3함량적제고，1700℃소후시양적현기공솔축점증대，체적밀도、상온내압강도화상온항절강도축점감소，소후선수축솔축점감소，소후시양중적기공형상변득불완정，공벽결구축점소송；종합고필료장성능화소후시양적성능，부려괄도（Al2 O3질량분수76％～80％）적첨정석원료교괄의채용본공예래제비첨정석격열재료。
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.