摘要
用机械合金化方法制备了Al-Ni-Ti-Zr非平衡态合金粉末。将制备的Al基非平衡态合金粉末与聚四氟乙烯(PTFE)微米粉混合压制制备了非平衡态Al-Ni-Ti-Zr/PTFE反应材料。采用X射线衍射仪(XRD)和扫描电镜(SEM)表征了球磨过程中粉末的相组成和形貌特征。利用高分辨透射电子显微镜(HRTEM)和选区电子衍射(SAED)分析了球磨后合金粉末的相结构。利用差示扫描量热法(DSC)分析了非平衡态Al/PTFE反应材料的热行为。结果表明:通过机械合金化方法可以制备出Al基非平衡态合金粉末。存在弥散在Al基非晶基体中的纳米级微晶岛状区域。在升温速率10 K·min^(-1)、空气气氛下,非平衡态Al/PTFE反应材料的反应峰值温度为495℃,放热峰积面积为1775 J·g^(-1)。连续升温条件下,非平衡态Al/PTFE反应材料的放热反应具有典型的动力学特征,通过Kissinger法计算的反应活化能E_c为309.1 kJ·mol^(-1)。
The Al-Ni-Ti-Zr non-equilibrium alloy powder was prepared by mechanical alloying method. The Al-Ni-Ti-Zr non-equi- librium alloy powder/polytetrafluoroethylene（PTFE） reactive materials were prepared via mixing/pressing using AI-based non-equilibrium alloy powders and PTFE micro powders. The phase composition and morphology characteristics of the powders during ball milling were characterized by X ray diffraction（XRD） and scanning electron microscopy（SEM）. The phase structure of the milled alloy powders was analyzed by high resolution transmission electron microscopy（HRTEM） and selected area electron diffraction（SAED）. The thermal behaviors of non-equilibrium AI/PTFE reactive materials were examined by differential scanning calorime- try（DSC）. The results show that the AI-based non-equilibrium alloy powders can be prepared by mechanical alloying method. There is a nano scale micro-crystalline island area dispersed in amorphous phase matrix. The peak temperature and exothermic peak area of non-equilibrium AI/PTFE reactive materials at a heating rate of 10 K· min^-1 in air are 495 ℃ and 1775 J · g^-1 , respectively. Under the continuous heating condition, the exothermic reaction of the non-equilibrium Al/PTFE reactive materials has the typical kinetic characteristics, and the activation energy Ec of the reaction is calculated as 309.1 kJ · mol^-1 by Kissinger method.
出处
《含能材料》
EI
CAS
CSCD
北大核心
2016年第6期582-586,共5页
Chinese Journal of Energetic Materials
基金
中央高校基本科研业务项目(NP2012303)
江苏高校优势学科建设工程资助项目
关键词
反应材料
机械合金化
非平衡态
铝
聚四氟乙烯(PTFE)
reactive materials
mechanical alloying
non-equilibrium
aluminum
polytetrafluoroethylene（PTFE）
