Ignition and Combustion of Super-Reactive Thermites of AlMg/KMnO4

摘要:

采用机械球磨法制备不同比例的Al-Mg合金，然后采用超声分散法制备AlMg/KMnO4铝热剂。通过DSC、点火温度和燃烧性能测试对AlMg/KMnO4铝热剂进行了性能表征。结果表明：随着镁含量的增加AlMg/KMnO4反应温度明显降低，表明其热反应活性优于Al/KMnO4；此外随着Mg含量（质量分数）从10%增加到50%，点火温度和燃烧速度分别从723 K降低至493 K和254 mg/s降至204 mg/s，其中Al0.5Mg0.5/KMnO4火焰溅射范围大幅提高

Abstract:

Al1-xMgx (x=0.1, 0.2, 0.3, 0.4, 0.5) alloys (designated here after as AlMg alloys) were prepared by mechanical ball milling. The thermites were prepared by sonication dispersion method. AlMg/KMnO4 thermites with different Al/Mg ratios were investigated by differential scanning calorimetry (DSC), ignition and combustion measurements. The results show that the reaction temperatures of AlMg/KMnO4 thermites decrease obviously with the increase of Mg contents, indicating that the thermal reactivity of AlMg/KMnO4 thermites is superior to that of Al/KMnO4. Furthermore, it is found that both the reaction temperatures and the burning velocities of AlMg/KMnO4 thermites decrease from 723 to 493 K, and from 254 to 204 mg/s, respectively, as the content of Mg increases from 0.1 to 0.5, among which the Al0.5Mg0.5/KMnO4 thermite displays the largest flame splash range. It is expected that AlMg/KMnO4 will be the most promising energetic material in ordnance applications