添加MgO对铁铝尖晶石合成和烧结的影响  

Effect of MgO on synthesis and sintering of hercynites

作　　者：马淑龙[1] 李勇[1] 孙加林[1] 王志发[2] 

机构地区：[1]北京科技大学材料与工程学院,北京100083 [2]河北理工大学材料学院,河北唐山063009

出　　处：《耐火材料》2010年第5期334-337,共4页Refractories

摘　　要：以氧化铁粉、α-Al2O3粉、石墨粉为主要原料,分别外加质量分数为0、2%、5%和8%的氧化镁粉,以亚硫酸纸浆废液为结合剂混练均匀后,压制成型为50 mm×50 mm的试样,于100℃干燥24 h,在氮气气氛中分别于1 400、1 450、1 500和1 550℃保温4 h煅烧,然后检测烧后试样的体积密度,并分析其物相组成和显微结构。结果表明:在氮气气氛下,添加氧化镁粉可明显降低铁铝尖晶石的合成温度,并促进铁铝尖晶石的烧结;在1 450℃,Fe2O3与α-Al2O3可完全反应生成铁铝尖晶石;氧化镁粉的适宜外加量(质量分数)为5%,过多会生成难被还原的MgFe2O4尖晶石相。Specimens with size ofφ50 mm×50 mm were prepared using the powders of Fe2O3,α-Al2O3 and graphite as starting materials,extra-adding MgO powder（0,2%,5%,and 8%）,using lignosulfite as binder,mixing well,molding,drying at 100 ℃ for 24 h,and firing at 1 400,1 450,1 500 and 1 550 ℃ for 4 h in N2 atmosphere,respectively.The bulk density was determined.Phase composition and microstructure were analyzed.The results show that MgO can obviously decrease the synthesis temperature of hercynites and promote its sintering in N2 atmosphere;Fe2O3 and α-Al2O3 can fully react forming hercynite at 1 450 ℃ in N2 atmosphere;the optimum addition of MgO is 5%,when added more,some MgFe2O4 spinel hard to reduce is synthesized.

关 键 词：铁铝尖晶石 氮气气氛 氧化镁 合成 烧结 

分 类 号：TQ175.713[化学工程—硅酸盐工业]