Enhancing the high temperature oxidation behavior of Cr<sub>2</sub>AlC coatings by reducing grain boundary nanoporosity
Xiang Chen, Bastian Stelzer, Marcus Hans, Riza Iskandar, Joachim Mayer, Jochen M. Schneider
Abstract
The oxidation behavior of Cr2AlC MAX phase coatings with columnar and equiaxed morphologies is compared. After oxidation at 1100°C for 240 min the Cr2AlC MAX phase coatings with equiaxed grains showed a 20% lower scale thickness and a 52% larger scale grain size as the coatings with columnar grains. Transmission electron microscopy data suggests that this is primarily caused by nanopores (2–25 nm) present in the columnar grain boundaries. As their presence has previously been overlooked, a 20% improvement of the high temperature oxidation behavior of Cr2AlC coatings is obtained if the formation of nanopores is avoided.
Topics & Concepts
Equiaxed crystalsMaterials scienceGrain boundaryTransmission electron microscopyNanoporePhase (matter)Grain sizeChemical engineeringComposite materialMicrostructureNanotechnologyChemistryOrganic chemistryEngineeringMXene and MAX Phase MaterialsAluminum Alloys Composites PropertiesAdvanced ceramic materials synthesis