n-Al/n-PTFE复合物的热行为

Thermal Behaviour of n-Al/n-PTFE Composite

在Ar气氛保护下,用TG-DSC研究了3种n-Al/n-PTFE复合物(包括化学计量配比和富燃料配比复合物)的热行为,用XRD和FE-SEM对其热反应产物进行了形貌观察和成分分析。结果表明,在520～590℃,3种复合物均发生反应,出现剧烈放热,两组富燃料配比复合物在470～520℃还出现了"预点火"现象,在590～800℃仍有反应发生,而化学计量配比复合物则未观察到预点火现象和590～800℃区间的反应。SEM和XRD结果显示,残余产物被熔接成团聚体,主要为AlF3相,并伴随着部分未反应的Al。

Thermal behaviours of three kinds of n A1/n PTFE composites including stoichiometric composites and fuel-rich composites were examined by TG-DSC in an argon environment. The phase and morphologies of the residual products after thermal decomposition were characterized by XRD and FE-SEM, respectively. The results showed that the violent exothermic reaction of all the composites took place at 520-590℃. The pre-ignition reaction of the two fuel-rich composites occurred at 470--520℃ and still the exothermic reaction at 590--800℃, whereas the above behaviors were not occured in stoichiometric composites. The results of SEM and XRD indicated that the residual products were melted together and the products were mainly A1F3, along with partial unreacted A1.