Oxygen incorporation in Ti2AlC MAX phases as bond coats: Multi-scale simulations for enhanced thermal shock resistance
Source abstract
Abstract
In thermal barrier coating (TBC) systems, MAX phases have emerged as potential alternatives to conventional metallic bond coats (BCs). Using multi-scale simulations, we examined how oxygen incorporation affects the high-temperature behavior of Ti 2 AlC. Although oxygen is typically considered harmful in BCs, Ti 2 Al(C 1-x O x ) showed different results that moderate oxygen incorporation lowers Young's modulus and increases the thermal expansion coefficient. This oxygen-induced softening effectively mitigates the large stiffness and thermal-expansion between the ceramic top coat and the superalloy substrate, thereby reducing thermal stress. Comparisons with CoNiCrAlY and (Ni,Pt)Al across several substrates showed that Ti 2 Al(C 1-x O x ) consistently produced lower stresses, particularly near the thermally grown oxide (TGO)–BC interface where failure usually initiates. These results indicate that oxygen incorporation, unavoidable in practical situations, can be used to tune Ti 2 AlC for improved reliability, supporting its use as a next-generation BC.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: MXene and MAX Phase Materials · Energetic Materials and Combustion · Advanced ceramic materials synthesis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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