氢氧化镁粒度对刚玉-尖晶石材料结构与性能的影响  

Effect of magnesium hydroxide particle size on structure and properties of corundum-spinel materials

作　　者：黄传 倪月娥[1] 柯昌明[1] 刘学新[1] 王景然[1] 张锦化[1] Huang Chuan;Ni Yue’e;Ke Changming;Liu Xuexin;Wang Jingran;Zhang Jinhua(The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China)

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北武汉430081

出　　处：《耐火材料》2021年第4期305-308,共4页Refractories

摘　　要：以氢氧化镁和α-Al_(2)O_(3)微粉为原料,经过干混、成型和1750℃反应烧结制备了刚玉-尖晶石骨料,研究了氢氧化镁粒度(平均粒径分别为55、36.4和10.6μm)对刚玉-尖晶石材料体积密度、气孔率及显微结构等的影响。结果表明:随着氢氧化镁粒度的减小,试样的体积密度增加,显气孔率下降,封闭气孔增加,总气孔率和孔径逐渐下降;当氢氧化镁粒度减小时,氢氧化镁和Al_(2)O_(3)的分布更为均匀,有效接触面积增大,可以促进固相反应的进行,会形成更为细小的、分布更为均匀、广泛的封闭气孔;试样在500℃下的热导率随着氢氧化镁粒度的减小而增大。Corundum spinel aggregates were prepared using magnesium hydroxide andα-Al_(2)O_(3) micropowder as starting materials,dry mixing,molding and reaction sintering at 1750℃.The effect of the particle size of magnesium hydroxide(average size of 55,36.4 and 10.6μm)on the bulk density,the porosity and the microstructure of corundum-spinel materials was studied.The results show that with the decreasing particle size of magnesium hydroxide,(1)the bulk density of corundum-spinel materials increases,the apparent porosity decreases,the closed pores increase,and the total porosity and the pore size decrease gradually;(2)the distribution of magnesium hydroxide and Al_(2)O_(3) is more uniform and the effective contact area increases,which can promote the solid reaction and form finer,more uniform and extensive closed pores;(3)the thermal conductivity at 500℃of the sample increases.

关 键 词：刚玉-尖晶石骨料 氢氧化镁 气孔分布 显微结构 

分 类 号：TQ175[化学工程—硅酸盐工业]