CrO_3对Fe_2O_3+Al铝热反应系统反应过程的影响  

Influence of CrO_3 Additive on the Thermite Reaction Procedure in Fe_2O_3+Al System

作　　者：王双喜[1] 梁开明[1] 张献辉[1] 顾守仁[1] 徐伟[1] 

机构地区：[1]清华大学材料科学与工程系,北京100084

出　　处：《无机材料学报》2002年第5期1068-1072,共5页Journal of Inorganic Materials

摘　　要：用铝热-重力分离法制备了不含铁铝尖晶石（FeAl2O4）的陶瓷内衬复合钢管,并通过热力学计算分析了有关反应的优先顺序,结果表明,在Fe2O3+Al系统中强氧化剂Cro3与Al的反应并不是一步完成而是分步反应,FeAl2O4优先于Cr2O3与Al反应,因而加入CrO3添加剂可有效地去除陶瓷层中的尖晶石相,从而提高复合钢管的耐蚀性能.A hercynite-free ceramic lined steel pipe was fabricated by the self-propagating high-temperature synthesis gravitational-thermite process(SHS G-T Process). The sequence of some reactions which are possible to take place in the aluminothermic system was determined by thermodynamic analysis, i.e. CrO3 >Fe2O3 >Fe3O4 > FeO > FeAl2O4 > Cr2O3. The results show that in Fe2O3+Al system CrO3 reacts with Al in two steps. This gives the possibility of elimination of FeAl2O4 phase, which is more reactive than Cr2O3.

关 键 词：自蔓延高温合成技术 热力学 CRO3 FeAl2O4 陶瓷内衬复合钢管 氧化铬 氧化铁 铝 

分 类 号：TQ174.1[化学工程—陶瓷工业]