Synthesis of (Cr,V)xCy-T MXene Materials from (Cr,V)2AlC MAX Phase Produced via Powder Metallurgy Methods

Öz

MAX (Mn+1AXn) phases represent a class of ternary metallic ceramics distinguished by their remarkable properties, rendering them highly sought after across various applications. Among these, their role as precursors for the production of 2D MXene materials stands out prominently in the realm of advanced ceramics. MXenes are obtained through the selective etching of the A-element layers from MAX phases, resulting in ultrathin layers with unique characteristics. The predominant method for MXene synthesis involves wet chemical processes, typically employing HF etching. These layered structures exhibit exceptionally high surface areas, positioning them as frontrunners for electronic applications. In this study, (Cr,V)2AlC precursor was produced by pressureless sintering of mechanically milled pure metallic powder mixtures. Subsequently, the MAX phase precursor was subjected to HF etching to obtain (Cr,V)-C-based MXenes. Both MAX and MXenes were analysed with XRD, SEM-EDS methods, and micro-hardness measurements. According to the results, the Optimal morphology which revealed a layered MXene structure for wet chemical etching of produced MAX phase materials was obtained after 4 hours of high-energy ball-milled Cr, V, Al, and C starting powder mixtures. Furthermore, the surface terminations (-T) which are an inevitable consequence of the regular chemical etching process, were identified following the analysis of the etched MXenes. In conclusion, this study accentuates the importance of optimizing synthesis methods for MAX phases to obtain tailored MXene materials, crucial for advancing applications in advanced ceramics.

Anahtar Kelimeler

• MAX
• MXene
• powder metallurgy

Kaynakça

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