稀土铈对铝镁铈合金燃料热性能的影响

Effect of Rare Earth Ce on Thermal Performance of Al-Mg-Ce Alloy Fuels

采用熔炼法制备了Mg的质量分数为15%、Ce的质量分数为0%,1%,3%和5%的Al-Mg和Al-Mg-Ce合金燃料。用XRD、DTA-TG和SEM/EDS分别表征了合金燃料的物相组成、氧化放热行为和形貌/元素分布,分析添加不同质量分数稀土Ce的合金氧化反应差异性的原因及Al-Mg-Ce合金的氧化行为。结果表明,随着Ce含量的升高,Al-Mg-Ce合金的氧化放热性能逐渐降低。稀土Ce的添加使Al-Mg-Ce合金第一个放热峰开始温度比Al-Mg合金粉低160℃左右。其中,Al-15Mg-1Ce合金粉的氧化放热焓为6413μV·s/mg,1300℃时的增重为90%,表现出更好的热性能。

Al-Mg and Al-Mg-Ce alloy fuels were prepared by a melting method, in which the mass fraction of Mg was 15% and the mass fraction of Ce were 0%, 1%, 3%, 5%. The phase composition, oxidation exothermic performance and appearance/element distribution of alloy fuels were characterized by XRD, TG-DTA and SEM/EDS, respectively. The reason of differences in oxidation exothermic reaction between alloys with different mass fractions of rare earth Ce and the oxidation behavior of Al-Mg-Ce alloys were analyzed. The results show that the oxidation exothermic performance of Al-Mg-Ce alloys declines gradually with the increasing of Ce content. The first oxidation reaction temperature of Al-Mg-Ce alloy powders is about 160 ℃ lower than that of Al-Mg alloy powders due to the addition of Ce. Al-15Mg-1 Ce alloy powders exhibit better thermal performance with the heat enthalpy of 6413 μV·s/mg and mass increasing of 90% at 1300 ℃ among them.