On the interactions of Ti2AlC, Ti3AlC2, Ti3SiC2 and Cr2AlC with pure sodium at 550 °C and 750 °C
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Abstract
Abstract Herein we report on the interaction of the Mn+1AXn phases – Ti2AlC, Ti3AlC2, Ti3SiC2 and Cr2AlC – with static, pure molten sodium. The MAX phases were sealed in 316 stainless steel tubes filled with Na that, in turn, were heated to 550 °C or 750 °C for 168 h. Based on scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD) of post-exposed samples we conclude that even after exposure for 168 h at 750 °C, Ti2AlC, Ti3SiC2 and Cr2AlC did not react with Na. In the case of Ti3AlC2, exposure to molten Na alters both the grains and the grain boundaries, despite the fact that no Na signal was detected in the post-exposed samples. These chemical alterations were observed in TEM and manifested themselves by a change in the hardness values of the exposed surfaces.
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Research context
OpenAlex topics: MXene and MAX Phase Materials · Aluminum Alloys Composites Properties · Advanced materials and composites
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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