无机材料学报

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CrO3对Fe2O3+Al铝热反应系统反应过程的影响

王双喜; 梁开明; 张献辉; 顾守仁; 徐伟   

  1. 清华大学材料科学与工程系 北京 100084
  • 收稿日期:2001-09-07 修回日期:2001-11-09 出版日期:2002-09-20 网络出版日期:2002-09-20

Influence of CrO3 Additive on the Thermite Reaction Procedure in Fe2O3+Al System

WANG Shuang-Xi; LIANG Kai-Ming; ZHANG Xian-Hui; XU Wei   

  1. Department of Materials Science and Engineering; Tsinghua University; Beijing 100084; China
  • Received:2001-09-07 Revised:2001-11-09 Published:2002-09-20 Online:2002-09-20

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.

关键词: 自蔓延高温合成技术, 热力学, CrO3, FeAl2O4

Abstract: 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.

Key words: self-propagating high-temperature synthesis, thermodynamics, CrO3, FeAl2O4

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