Al-Mg合金的制备和燃烧性能研究

Preparation and properties of Al-Mg alloy powders as combustion agent

通过Pandat热力学软件,计算了Al-Mg合金不同温度和组成的生成焓,筛选出可能作为燃烧剂的Al-Mg合金组成和制备条件。然后在500℃采用热处理的方式,制备了Al-Mg合金粉,对产物结构、形貌、组成等进行了分析,发现产物由Al3Mg2和FCC固溶体相组成。通过TG-DSC、氧弹量热仪测试了合金粉的氧化、燃烧性能,并分析了反应机理。与单质和相应组成的混合粉进行对比,发现合金粉比混合粉更易发生反应,且反应更完全,放出的热量也更多。

The formation enthalpies of A1-Mg binary alloys in the range of 25 - 4 000 ℃ were calculated by Pandata software package and the composition and synthesis conditions were obtained.The results show that when the mole amount of Mg element is 0. 29 the alloy has the positive maximum formation enthalpies,7.87 kJ/mol.The phase structure has direct effect on the formation en- thalpy.Then, Al-Mg alloy powders were prepared by heat treatment using Al particles and Mg particles as the starting materials. The samples were analyzed by X-ray diffraction, SEM and combustion heats were tested by TG-DSC and oxygen bomb calorimetry.The re- suits show that alloy are consist of Al3Mg2 and FCC solid solution.At the same conditions, alloy releases combustion heat more easily and fully than the corresponding mixture powders.