Enhancing the high temperature oxidation behavior of Cr2AlC coatings by reducing grain boundary nanoporosity

Autor:	Xiang Chen, Bastian Stelzer, Marcus Hans, Riza Iskandar, Joachim Mayer, Jochen M. Schneider
Jazyk:	angličtina
Rok vydání:	2021
Předmět:	max phases nanoporosity oxidation behavior Materials of engineering and construction. Mechanics of materials TA401-492
Zdroj:	Materials Research Letters, Vol 9, Iss 3, Pp 127-133 (2021)
Druh dokumentu:	article
ISSN:	2166-3831 21663831
DOI:	10.1080/21663831.2020.1854358
Popis:	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.
Databáze:	Directory of Open Access Journals
Externí odkaz:	https://doaj.org/article/95e5218d3b724002a6d72bfa94a75552 Zobrazit plný text záznamu View record in DOAJ