It is known that materials based on MAX phases possess a large potential for use in aerospace, automobile, and industrial spheres because they have a unique combination of features of both metals and ceramics with high mechanical, chemical, thermal, and electrical properties. In this work, the experimental results of fabricating cast materials in the Cr–Al–C system with different ratios between the Cr₂AlC MAX phase and chromium aluminides and carbides by SHS metallurgy are presented. The experiments were performed in an SHS reactor 3 L in volume at an initial inert gas (argon) pressure of 5 MPa. The synthesis was performed based on chemically coupled reactions: weakly exothermic (heat acceptor)—Cr₂O₃/3Al/C and strongly exothermic (heat donor)—3CaO₂/2Al. The experimental results have good correlation with the preliminary thermodynamic calculations. It is shown that, when varying the composition of initial mixtures, it is possible to substantially affect the calculated and experimental synthesis parameters, as well as the phase composition and microstructure of final products. Optimal synthesis conditions of the material providing the maximal yield of the Cr₂AlC phase in the ingot composition are established. The determining factor affecting the Cr₂AlC content in the product is the occurrence time of the liquid phase under the synthesis conditions. It is shown that the maximal content of the Cr₂AlC MAX phase and target product yield are attained at the 30% content of the strongly exothermic additive (3CaO₂/2Al) in the initial charge.

中文翻译：

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利用耦合化学反应通过SHS冶金生产基于Cr 2 AlC MAX相的铸造材料

众所周知，基于MAX相的材料具有巨大的潜力，可用于航空航天，汽车和工业领域，因为它们具有金属和陶瓷的独特特征组合，具有很高的机械，化学，热和电性能。在这项工作中，展示了通过SHS冶金技术在Cr–Al–C系统中以Cr ₂ AlC MAX相与铬铝化物和碳化物之比不同制造铸造材料的实验结果。实验在体积为3 L的SHS反应器中，初始惰性气体（氩气）压力为5 MPa。合成基于以下化学偶联反应进行：弱放热（受热体）-Cr ₂ O ₃ / 3Al / C和强放热（热供体）-3CaO_2/2铝。实验结果与初步的热力学计算具有良好的相关性。结果表明，当改变初始混合物的组成时，可能会大大影响计算和实验合成参数以及最终产物的相组成和微观结构。建立在铸锭成分中提供Cr ₂ AlC相最大产率的材料的最佳合成条件。影响产物中Cr ₂ AlC含量的决定因素是在合成条件下液相的出现时间。结果表明，Cr ₂的最大含量在初始进料中，强放热添加剂（3CaO ₂ / 2Al）的含量为30％时，可以达到AlC MAX相和目标产品的产率。