A comparative study of mechanical properties between HVOF-sprayed Maxphase materials

Paper in proceeding, 2009

Mn+1AXn –phases (MAX-phase materials) are ternary compounds consisting of an early transition metal (M), such as Ti or V, a p-element from group III-V (A) and C and/or N (X). The phases have a layered structure in which the A element form planes separated by MX slabs. This nanolaminated atomic arrangement gives rise to a unique set of properties. These properties in combination with a good match in thermal expansion between substrate and coating make MAX-phase materials challenging materials to extend the lifetime of thermal barrier coatings. Evaluation of properties of HVOF sprayed MAX-phase materials and to compare these properties with commercially used bond coat materials such as MCrAlY coatings is thus of great interest which was the aim of this study. The non-linear load displacement relationships and Young’s modulus for HVOF-sprayed Ti2AlC coatings and APS sprayed NiCoCrAlY coatings onto Hastalloy X substrates were determined using data from both Berkovich and spherical microindentation. Results between Berkovich and spherical microindentation measurements are compared and discussed.