In:
Journal of Advanced Ceramics, Tsinghua University Press, Vol. 11, No. 10 ( 2022-10), p. 1571-1582
Kurzfassung:
High-entropy rare-earth aluminate (Y 0.2 Yb 0.2 Lu 0.2 Eu 0.2 Er 0.2 ) 3 Al 5 O 12 (HE-RE 3 Al 5 O 12 ) has been considered as a promising thermal protection coating (TPC) material based on its low thermal conductivity and close thermal expansion coefficient to that of Al 2 O 3 . However, such a coating has not been experimentally prepared, and its thermal protection performance has not been evaluated. To prove the feasibility of utilizing HE-RE 3 Al 5 O 12 as a TPC, HE-RE 3 Al 5 O 12 coating was deposited on a nickelbased superalloy for the first time using the atmospheric plasma spraying technique. The stability, surface, and cross-sectional morphologies, as well as the fracture surface of the HE-RE 3 Al 5 O 12 coating were investigated, and the thermal shock resistance was evaluated using the oxyacetylene flame test. The results show that the HE-RE 3 Al 5 O 12 coating can remain intact after 50 cycles at 1200 °C for 200 s, while the edge peeling phenomenon occurs after 10 cycles at 1400 °C for 200 s. This study clearly demonstrates that HE-RE 3 Al 5 O 12 coating is effective for protecting the nickel-based superalloy, and the atmospheric plasma spraying is a suitable method for preparing this kind of coatings.
Materialart:
Online-Ressource
ISSN:
2226-4108
,
2227-8508
DOI:
10.1007/s40145-022-0630-2
Sprache:
Englisch
Verlag:
Tsinghua University Press
Publikationsdatum:
2022
ZDB Id:
2682430-9