弱放热反应TiSi_2燃烧合成的研究

Combustion Synthesis of TiSi2 in Weakly Exothermic Reaction

采用燃烧合成法合成了绝热温度为１８００Ｋ的ＴｉＳｉ２。分析了毛坯直径和初始孔隙率、Ｔｉ颗粒及预热温度对燃烧合成的影响，证实满足Φ＝９２ｍｍ，ρ＝５２％的－３００目钛粉形成的毛坯在常温才能发生自蔓延反应。利用燃烧波前沿熄淬法（ＣＦＱ）研究了ＴｉＳｉ２形成机制。当Ｔ≤ｌ３３０℃时ＴｉＳｉ２通过扩散反应机制进行；当Ｔ＞１３３０℃时，ＴｉＳｉ２反应机制则是溶解－沉淀析出。分别利用ＸＲＤ和ＳＥＭ分析了产物及其过渡区相变的微观组织变化。

Abstract Single phase titanium disilicide was synthesized with elemental reactants at 1000K in argon by combustion synthesis.The effect of size and porosity of reactants,the particle size of Ti and the preheating temperature on combustion synthesis was analyzed.In result,the compacts( Φ=92mm,ρ=52%) of -300 mesh Ti powder with reactants can be ignited at the room temperature.The reaction mechanism has been studied.