论文标题
通过自传高温燃烧合成的超快速合成和热力学分析
Ultra-fast synthesis and thermodynamic analysis of MoAlB by self-propagating high temperature combustion synthesis
论文作者
论文摘要
Moalb作为MAB相的典型成员，由于其独特的特性，人们引起了很多不断增长的关注。但是，低产量的Moalb粉末限制了其进一步的发展和潜在的应用。为了应对这一挑战，使用原子粉混合物以1MO/1.3AL/1B的原子比以自传播的高温燃烧合成（SHS）来在几秒钟内实现高纯度Moalb粉末的超快速制备。通过分析起始材料的相应组成变化获得了SHS过程中的反应机制。此外，MO +（1 + Y）Al + B = Moalb + Yal的SHS反应的热力学预测与当前的实验一致，在此实验中，Moalb的制备也符合SHS的两个常见的自我传播条件。焓与温度曲线表明，反应的绝热温度随着借口的增加而降低，但在预热反应物预热时会增加。热力学计算方法还为通过SHS制备其他MAB相的新想法。
MoAlB as a typical member of the MAB phases has attracted much growing attention due to its unique properties. However, the low production of MoAlB powders limits its further development and potential applications. To respond this challenge, the ultra-fast preparation of high-purity MoAlB powders is achieved in a few seconds by self-propagating high temperature combustion synthesis (SHS) using the raw powder mixture at the atomic ratio of 1Mo/1.3Al/1B. The reaction mechanism in SHS process was obtained by analyzing the corresponding composition changes of starting materials. Furthermore, the thermodynamic prediction for the SHS reaction of Mo + (1+y)Al + B = MoAlB + yAl is consistent with the present experiments, where the preparation of MoAlB also conforms to two common self-propagating conditions of SHS. Enthalpy vs temperature curve shows that the adiabatic temperature of the reaction decreases with increasing the amount of excuse Al, but increase when pre-heating the reactants. The thermodynamic calculation method also provides a new idea for the preparation of other MAB phases by SHS.
