Effect of temperature on the healing capacity and mechanical properties of Ti2AlC MAX phase ceramics

Abstract

AbstractIn this study, the self‐healing capacity of Titanium Aluminum Carbide (Ti2AlC, MAX phase) was investigated. Bulk coin samples were fabricated to evaluate the self‐healing capacity at different temperatures (1000, 1200, and 1400°C). The extensive self‐healing capacity of Ti2AlC was confirmed on larger quasiplastic damage (diameter ≥1 mm) and radial cracks by covering and filling of oxides such as titanium oxide, aluminum oxide, and aluminum titanate oxide. Although the mechanical properties of Ti2AlC after healing are similar or improved relative to the Ti2AlC before healing at the microscale, some properties of Ti2AlC after introducing larger damage and healing at 1400°C showed reduced values due to excessive oxide formation on the surface. For example, the strength of Ti2AlC healed at 1400°C exhibited 151.4 MPa, which is relative to the original strength of 298.3 MPa. Alternatively, the mechanical properties such as strength, hardness, toughness, and relative modulus of elasticity of Ti2AlC healed at 1000 or 1200°C and were restored to their original strength after healing. These findings suggest that Ti2AlC can be used as a healing agent for high‐temperature applications, such as environmental barrier coating for gas turbine hot‐gas components.