Abstract
This study investigates the decrease in oxygen concentration caused by the removal of α-Al2O3 inclusions in Ti3AlC2 MAX powder. The Ti3AlC2 MAX powder was deoxidized in the solid-state using calcium (Ca) as the reductant under contact and noncontact conditions. The oxygen concentration was decreased by removing the α-Al2O3 inclusions in Ti3AlC2 MAX powder through Ca contact and non-contact deoxidation. In the α-Al2O3 reduction reaction, Al diffusion and excess Ca interactions led to the formation of a Ti2AlC phase, which was suppressed by reducing amount of Ca used. Oxygen reduction without any phase change was possible through contact deoxidation at 750 °C for 5 h. The oxygen concentration of deoxidized MAX powder was 9,450 ppm. In the case of noncontact deoxidation, the Ti2AlC phase was suppressed by reducing the amount of Ca used to 0.5 g. The oxygen concentration of the deoxidized MAX powder was 3,400 ppm.
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