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MATERIALS ENGINEERING

SEMINAR

“Oxidation Kinetics of the Cr₂AlC MAX Phase”

By

Yujie Wang

Purdue MSE Preliminary Exam

Advisor: Professor Kenneth H. Sandhage

ABSTRACT

Currently, the MAX phase materials have received significant attention from scientists because of their promising practical application. The unique nano-layered structure provides a useful combination of metallic and ceramic properties. For example, MAX phases are typically characterized as being thermally and electrically conductive, plastically deformable, machinable, and thermal shock resistant like metals; as well as having high elastic moduli, excellent high-temperature mechanical properties, and good oxidation and hot corrosion resistance like ceramics. Among all the MAX phases, Cr₂AlC is a thermodynamically stable ternary compound with hexagonal structure. The chromium aluminium carbide (Cr₂AlC) exhibits excellent mechanical properties and good oxidation and hot corrosion resistance due to the formation of dense adherent α-Al₂O₃ protective layer. All those unique properties along with the excellent oxidation resistance make Cr2AlC an attractive material for high-temperature applications. However, it will be necessary to understand the oxidation mechanism and corresponding kinetics of Cr2AlC in order to predict the long-time performance at elevated temperatures. This is, in turn, implies that the oxidation kinetics need to be well understood. However, the kinetic behavior of Cr2AlC is still under controversy. In this document, the mechanisms of isothermal oxidation of Cr2AlC will be studied, and the corresponding rate-limiting steps would be reviewed.

Date: Wednesday, December 11, 2019

Time: 12:00 P.M.

Place: ARMS 1103