A cast material based on the Nb₂AlC MAX phase is formed by SHS metallurgy. The synthesis is performed using the Nb₂O₅–Al–C mixture with the CaO₂–Al high-energy additive. The results of thermodynamic calculations correlate with the experimental data. The substantial influence of the CaO₂–Al additive on the thermodynamic parameters and phase composition of the product is established. It is shown that the synthesis using mentioned mixtures occurs in a stationary mode with the formation of a steady combustion wave. The combustion rate increases from 6 to 12 mm/s with an increase in the additive content, and the product yield into the ingot increases from 30 to 47% (up to 15 wt % additive) and then decreases. The variation in the composition of initial mixtures can substantially affect both the synthesis parameters and the phase composition of products. The optimal synthesis conditions of the materials that provide the maximal yield of the Nb₂AlC MAX phase in the ingot composition are established. The determining factor that affects the Nb₂AlC content in the product is the liquid-phase lifetime under the synthesis conditions. It is shown that the maximal amount (67 wt %) of the Nb₂AlC phase is attained with the content of the high-energy additive in the initial charge of 15 wt %.

中文翻译：

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SHS冶金合成Nb 2 AlC MAX相。

通过SHS冶金形成基于Nb ₂ AlC MAX相的铸造材料。使用Nb ₂ O ₅ -Al-C混合物和CaO ₂ -Al高能添加剂进行合成。热力学计算的结果与实验数据相关。CaO ₂的实质性影响-建立了关于产品热力学参数和相组成的铝添加剂。结果表明，使用提及的混合物进行的合成在固定模式下进行，并形成稳定的燃烧波。随着添加剂含量的增加，燃烧速率从6 mm / s增加到12 mm / s，进入铸锭的产品产率从30％增加到47％（最多15 wt％添加剂），然后降低。初始混合物组成的变化会大大影响合成参数和产物的相组成。建立了在铸锭成分中提供Nb ₂ AlC MAX相最大产率的材料的最佳合成条件。影响Nb ₂的决定因素产品中AlC含量是合成条件下的液相寿命。结果表明，在初始装料中，高能量添加剂的含量为15 wt％时，Nb ₂ AlC相达到了最大量（67 wt％）。