氧分压对铁铝尖晶石稳定性的影响  

Effect of O_2 Partial Pressure on Hercynite Stability

作　　者：李志坚[1] 付雪冰 丁达飞 栾旭[1] 吴锋[1] 

机构地区：[1]辽宁科技大学高温材料与镁资源工程学院,辽宁鞍山114051

出　　处：《硅酸盐学报》2016年第6期914-918,共5页Journal of The Chinese Ceramic Society

基　　金：国家科技支撑计划(2013BAF09B01)项目资助

摘　　要：将烧结铁铝尖晶石制成1．0-0．088ruin样品，控制气氛中氧气体积分数，进行25～1400℃的热重分析，研究不同含氧分压下铁铝尖晶石的氧化行为，并对氧化前后样品进行X射线衍射、扫描电子显微镜及能谱分析。结果表明：烧结铁铝尖晶石的氧化为保护型氧化，气氛中氧气体积分数在0．3％左右时，铁铝尖晶石较为稳定，晶粒表面氧化形成排列规整致密的刚玉及赤铁矿致密保护层，内部未氧化；氧气体积分数在8．0％左右时，铁铝尖晶石完全氧化，产生片状、粒状的刚玉相及赤铁矿相；氧气体积分数在18．0％左右时，样品中残留较多纯净铁铝尖晶石相，铁铝尖晶石晶粒表面氧化形成无定形刚玉及赤铁矿相，氧化程度较为剧烈，晶粒保留八面体结构。A sintered hercynite powder with the sizes of 1.0-0.088 mm was prepared via grinding. The oxidation behavior of the sintered hercynite powder at different oxygen volume fractions was investigated through the thermogravimetric analysis at 25- 1 400℃. The fired samples were characterized by X-ray diffraction, scanning electron microscopy and energy dispersive spectrometry, respectively. The results show that the oxidation of sintered hercynite is protective oxidation. When the oxygen volume fraction is 0.3%, hercynite is more relatively stable and there are some dense and regular arrangement phases of corundum and hematite on the grain surface as a protective layer, and the inside of the grains is not oxidized. When the oxygen volume fraction is 8.0%, hercynite is completely oxidized to form flaky and grainy phases of corundum and hematite. When the oxygen volume fraction is 18.0%, there are some residual pure hercynite phases existed in the specimen, the surface of hercynite grains is oxidized to form some shapelessness phases of corundum and hematite. The oxidization is more serious and the grains are still in an octahedral structure.

关 键 词：铁铝尖晶石 热重分析 氧含量 稳定性 

分 类 号：TQ175[化学工程—硅酸盐工业]