摘要
为研究FOX-7及其与HMX混合体系的热性能,采用差示扫描量热仪(DSC)、热常数分析仪等手段,对HMX与FOX-7等质量比共混物、以及具有不同HMX与FOX-7比例的炸药配方的热分解行为、导热性质等开展了研究。结果表明:在FOX-7/HMX混合体系中,HMX与FOX-7的分解放热以及晶型转变吸热过程可相互影响:HMX在247.3℃处已有部分分解,282.5℃出现的放热峰对应于HMX的分解放热峰和FOX-7的第2步分解峰的叠加;而FOX-7的β到γ晶型转变以及HMX的β到δ晶型转变吸热峰相较于单质颗粒,分别延迟了8.5℃、9.5℃。配方中HMX与FOX-7的相对含量决定了两者的分解峰温,这可能与两者热效应的相互影响及粘结剂对炸药颗粒包覆完整度有关:随着配方中HMX含量由25%增加至60%,其熔融吸热峰由276.6℃提前至252.5℃;随着配方中FOX-7含量由25%增加至60%,其第1步分解峰和HMX的熔融分解过程相互影响,导致只出现一个分解放热峰,FOX-7第1步分解反应放热将导致其更早发生熔融分解。FOX-7颗粒的热导率、热扩散系数、比热容都高于HMX。在总含量不变的情况下,随着FOX-7含量的提高、HMX含量的降低,混合炸药配方的热导率、热扩散系数、比热容都随之提高。
To study the thermal properties of FOX-7 and its mixed system with HMX,differential scanning calorimetry(DSC)and thermal constant analyzer were used to investigate the thermal decomposition behavior,thermal conductivity,and other thermal properties of HMX and FOX-7 blends,as well as explosive formula with different ratios of HMX to FOX-7.The thermal properties of explosive formulations were also studied by slow burning test.The results show that in the FOX-7/HMX mixed system,the decomposition heat release and crystal form transformation heat absorption of HMX and FOX-7 interact with each other:HMX is partially decomposed at 247.3℃,and the exothermic peaks at 282.5℃corresponding to the superposition of the decomposition peak of HMX and the second decomposition peak of FOX-7.The endothermic peaks ofβ-γtransition of FOX-7 andβ-δtransition of HMX are delayed by 8.5℃and 9.5℃,respectively compared with those of elemental particles.The relative content of HMX and FOX-7 in the formula determines the decomposition peak temperature of both,which may be related to the mutual influence of the thermal effect of the two and the integrity of the adhesive on the encapsulation of explosive particles.As the HMX content in the formula increases from 25%to 60%,its melting endothermic peak advances from 276.6℃to 252.5℃;As the content of FOX-7 in the formula increases from 25%to 60%,the first step decomposition peak and the melting decomposition process of HMX interact,resulting in only one exothermic decomposition peak.The exothermic decomposition reaction of FOX-7 in the first step will cause it to undergo melting decomposition earlier.The thermal conductivity,thermal diffusivity,and specific heat capacity of FOX-7 particles are higher than those of HMX.With the increase of FOX-7 content and the decrease of HMX content,the thermal conductivity,thermal diffusion coefficient,and specific heat capacity of the mixed explosive formula increase with the constant total content.
作者
谢虓
于谦
祝青
黄辉
XIE Xiao;YU Qian;ZHU Qing;HUANG Hui(Institute of Chemical Materials,CAEP,Mianyang 621999,China;China Academy of Engineering Physics,Mianyang 621900,China)
出处
《兵器装备工程学报》
CAS
CSCD
北大核心
2024年第1期217-222,共6页
Journal of Ordnance Equipment Engineering
基金
国家自然基金项目(11702269)。
