摘要
针对ＳＨＳ铝热还原合成中氧化铝膜可造成反应的活化障碍，研究了氯盐对其活化增强的效果以及作用机理．研究表明，ＮａＣｌ、ＬｉＣｌ、ＭｇＣｌ２、ＣａＣｌ２、ＢａＣｌ２在适量加入的条件下，均有不同程度提高铝热基ＳＨＳ反应速度的作用，其增强效果取决于氯化物的热稳定性，而作用机理为加碳卤化反应导致的氧化铝膜汽化．
Thermal effect of thermite reaction call be greatly lowered since the presence of oxide film on the Al reductant particles. In the present work, an active mechanism for the reaction barrier was invesitigated.It was found that NaCl, LiCl, MgCl2, CaCl2 and BaCl2 as additives can promote combustion velocity ofthermite-based SHS procedure in varying degrces, depending on their chemical stability. Based on the analysis of thermodynamics, the vaporization of alumiua film conducted by a halogenate reaction added with carbon was considered to be the active mechanism.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
1996年第4期745-748,共4页
Journal of Inorganic Materials
基金
中国科学院高性能陶瓷资助
超微结构国家重点实验室基金
关键词
氧化铝
活化
铝热反应
高温合成
alunmina, actiye barrier, chloride, thermite, halogenate reaction
