WEB Tribological properties of self-healing, solid lubricant MAX phase thin filmsWednesday (01.01.2020) 00:30 - 00:45 Part of:
Mn+1AXn (short: MAX) phases are ternary nano-laminar carbides or nitrides that are known for their interesting combination of properties. On one hand, they possess a high mechanical stability and hardness as well as thermal resistance in the range of ceramics, whereas on the other hand, they also show a high electrical conductivity in the range of metallic materials . Therefore, MAX phases are a highly interesting material for tribological applications. It could be shown, that MAX phases can be used as a solid lubricant in tribological applications. Thus, they show low wear and friction . Additionally it is known, that MAX phases exhibit self-healing abilities to a certain extend. To take advantage of this properties, the preparation of thin films on a wide variety of substrate is possible by different methods. One of the most used lately is magnetron sputtering . In this talk, the latest findings on the tribological behavior as well as the wear of Ti2AlC and Ti3AlC2 MAX phases will be presented. The two MAX phases were prepared by magnetron sputtering of a multilayer system based on the elements and stoichiometry required. The tribological properties of these thin films with a total thickness of approx. 500 nm were measured with a reciprocating micro-tribometer using different normal loads against a 100Cr6 steal ball. The resulting wear tracks were investigated regarding materials transfer from the steal to the MAX phase as well as the all over wear. Connecting these values to structural and mechanical properties of the MAX phase thin films can offer new insights to the wear mechanisms of these materials especially when using them as thin films.