摘要
根据PETN和GI-920炸药在升温速率分别为5,10,20 K.min-1的DSC-TG曲线,对PETN和GI-920炸药的热分解过程进行了研究,用Ozawa法和非线性等转化率积分法获得PETN和GI-920炸药热分解动力学参数和机理函数。结果表明,PETN与GI-920炸药的热分解机理属随机成核和随后生长。在不同升温速率的TG曲线上,GI-920炸药热失重开始温度大致相同。GI-920炸药DSC曲线呈现一个吸热熔化峰和一个放热分解峰,130℃以下有良好的热稳定性。GI-920炸药热分解的活化能、指前因子和机理函数分别为156.02 kJ.mol-1、1.934×1017s-1、f(α)=4/3(1-α)[-ln(1-α)]14,热分解动力学方程为:dα/dt=2.579×1017×(1-α)[-ln(1-α)]41exp(-(1.876×104)/T)。
The thermal decomposition processes of PETN and GI-920 explosives were studied by DSC-TG at heating rates of 5,10 and 20 K · min^-1 ,respectively. The thermal decomposition kinetic parameters and the mechanism function of PETN and GI-920 explosives were obtained by Ozawa＇s method and the integral isoconversional non-linear method. The results show that the thermal decomposition mechanism of PETN and GI-920 explosives is classified as random nucleation and growth. The initial temperatures of the thermal decomposition ＇of GI-920 explosive are approximately the same on TG curves with the different heating rates. DSC curve of the GI-920 explosive reveals an endothermic melting peak and an exothermic decomposition peak. The GI-920 explosive have good thermal stability below 130 ℃. The activation energy ,pre-exponential factor and mechanism function of the thermal decomposition process of GI-920 explosive are 156.02 kJ ·mol^-1 ,1.934 × 10^17 s^-1 andf（α） =4/3（1 -α）[ -ln（1 -α）1/4,respectively. The thermal decomposition kinetic equation is dα/dt = 2.579 × 10^17 × （1 - α）[ - ln（1 - α） ]^1/4exp（-1.876×10^4/T）.
出处
《含能材料》
EI
CAS
CSCD
2008年第1期1-4,共4页
Chinese Journal of Energetic Materials
