摘要
以硝酸锂和水合硝酸铝为氧化剂,使用柠檬酸和尿素作为燃料,根据推进燃料化学理论计算原料的配比,采用自蔓延高温合成法(SHS)快速合成出γ-LiAlO2的超细粉。研究了燃料种类及煅烧温度对合成产物相组成和粉末形貌的影响。根据吉布斯自由能最小原理以及化合价配比平衡法则,发现当燃料中尿素与柠檬酸的配比为9∶1时燃烧反应之所以能够快速持续地进行,究其基本原因在于燃料与相应的氧化剂之间形成了过渡型的络合物,进而降低了合成反应的活化能,使燃烧反应得以持续进行。
Super fine powders of γ-lithium aluminates could are synthesized by a self-propagating high-temperature synthesis method (SHS) for short reaction time, in which mixtures of metal nitrates, N(NO3), (M = Li, Al), and the urea and citric acid are used as oxidizers and fuels, respectively. The influences of fuels and various calcinations temperatures on the phase components and microstructure of combustion-synthesized products are described. A simple method of calculating the elemental stoichiometric coefficient is introduced on the propellant chemistry. The optimum molar ratio of urea to citric acid was found to be 9:1.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2003年第12期995-998,共4页
Rare Metal Materials and Engineering
基金
中国科技部基金资助项目(MSTCNo.G2000067207-1)
