Record number :
Title of article :
Formation of MAX solid solutions (Ti,V)2AlC and (Cr,V)2AlC with Al2O3 addition by SHS involving aluminothermic reduction
Author/Authors :
C.L. Yeh، نويسنده , , W.J. Yang، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2013
Pages :
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Abstract :
MAX solid solutions (Ti,V)2AlC and (Cr,V)2AlC with Al2O3 addition were produced by solid state combustion involving aluminothermic reduction in the mode of self-propagating high-temperature synthesis (SHS). Starting materials included TiO2/V2O5/Al/Al4C3 and Cr2O3/V2O5/Al/Al4C3 powder mixtures. Attempts were made to attain (Ti1−xVx)2AlC and (Cr1−yVy)2AlC with the V content in terms of x and y from 0.1 to 0.7. Combustion exothermicity was increased by increasing V2O5 for the yield of a higher proportion of V at the substitution site, which not only increased the combustion temperature and reaction front velocity, but also facilitated the evolution of solid solutions. Due to insufficient reaction exothermicity, (Ti1−xVx)2AlC/Al2O3 in situ composites were only produced under x≥0.4. On the other hand, the formation of (Cr1−yVy)2AlC/Al2O3 was achieved with y from 0.1 to 0.7, because reduction of Cr2O3 is more energetic than that of TiO2. The laminated microstructure characteristic of the MAX ternary carbide was observed for both Al2O3-added (Ti,V)2AlC and (Cr,V)2AlC composites synthesized in this study.
Keywords :
C. Toughness and toughening , A. Powders: solid state reaction , Ternary carbide solid solutions , B. Platelets , Self-propagating high-temperature synthesis (SHS)
Journal title :
Ceramics International
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