Multicomponent rare earth oxide stability against high temperature CMAS exposures

Kristyn D. Ardrey; Elizabeth J. Opila

doi:10.1016/j.mtla.2026.102740

Multicomponent rare earth oxide stability against high temperature CMAS exposures

Kristyn D. Ardrey
, Elizabeth J. Opila

Surface Engineering and Tribology

Research output: Contribution to journal › Article › peer-review

Abstract

Multicomponent rare earth oxides (MROs) are potential environmental barrier coating (EBC) candidate materials for protection of Nb-base refractory alloys in aero-turbine hot section combustion applications. The ability of MROs to withstand reactions with siliceous debris such as calcia-magnesia-alumino-silicate (CMAS) ingested into the hot-section of the turbine engine is a key requirement for EBCs. In this study, reactions of two MRO compositions with CMAS were studied at 1500 °C for times between 1 h and 100 h. (Y_0.33Yb_0.33Er_0.33)₂O₃ and (Y_0.2Yb_0.2Er_o.2Ho_0.2Nd_0.2)₃O₂ both reacted with molten CMAS to form barrier layers of cuspidine (Ca,RE)₄(Al,Si)₂O₉ and apatite Ca₂RE₈(SiO₄)₆O₂ phases. Apatite phases crystallized rapidly and were promoted by inclusion of Nd₂O₃ as a constituent of the MRO. MROs proved to be significantly more resistant to CMAS attack than other current oxide coating materials including yttria-stabilized zirconia and ytterbium disilicate.

Original language	English
Article number	102740
Journal	Materialia
Volume	46
DOIs	https://doi.org/10.1016/j.mtla.2026.102740
State	Published - May 2026

Keywords

CMAS
Environmental barrier coatings
Rare earth
Thermal barrier coatings

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10.1016/j.mtla.2026.102740

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title = "Multicomponent rare earth oxide stability against high temperature CMAS exposures",

abstract = "Multicomponent rare earth oxides (MROs) are potential environmental barrier coating (EBC) candidate materials for protection of Nb-base refractory alloys in aero-turbine hot section combustion applications. The ability of MROs to withstand reactions with siliceous debris such as calcia-magnesia-alumino-silicate (CMAS) ingested into the hot-section of the turbine engine is a key requirement for EBCs. In this study, reactions of two MRO compositions with CMAS were studied at 1500 °C for times between 1 h and 100 h. (Y0.33Yb0.33Er0.33)2O3 and (Y0.2Yb0.2Ero.2Ho0.2Nd0.2)3O2 both reacted with molten CMAS to form barrier layers of cuspidine (Ca,RE)4(Al,Si)2O9 and apatite Ca2RE8(SiO4)6O2 phases. Apatite phases crystallized rapidly and were promoted by inclusion of Nd2O3 as a constituent of the MRO. MROs proved to be significantly more resistant to CMAS attack than other current oxide coating materials including yttria-stabilized zirconia and ytterbium disilicate.",

keywords = "CMAS, Environmental barrier coatings, Rare earth, Thermal barrier coatings",

author = "Ardrey, \{Kristyn D.\} and Opila, \{Elizabeth J.\}",

note = "Publisher Copyright: Copyright {\textcopyright} 2026. Published by Elsevier Inc.",

year = "2026",

month = may,

doi = "10.1016/j.mtla.2026.102740",

language = "English",

volume = "46",

journal = "Materialia",

issn = "2589-1529",

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TY - JOUR

T1 - Multicomponent rare earth oxide stability against high temperature CMAS exposures

AU - Ardrey, Kristyn D.

AU - Opila, Elizabeth J.

PY - 2026/5

Y1 - 2026/5

N2 - Multicomponent rare earth oxides (MROs) are potential environmental barrier coating (EBC) candidate materials for protection of Nb-base refractory alloys in aero-turbine hot section combustion applications. The ability of MROs to withstand reactions with siliceous debris such as calcia-magnesia-alumino-silicate (CMAS) ingested into the hot-section of the turbine engine is a key requirement for EBCs. In this study, reactions of two MRO compositions with CMAS were studied at 1500 °C for times between 1 h and 100 h. (Y0.33Yb0.33Er0.33)2O3 and (Y0.2Yb0.2Ero.2Ho0.2Nd0.2)3O2 both reacted with molten CMAS to form barrier layers of cuspidine (Ca,RE)4(Al,Si)2O9 and apatite Ca2RE8(SiO4)6O2 phases. Apatite phases crystallized rapidly and were promoted by inclusion of Nd2O3 as a constituent of the MRO. MROs proved to be significantly more resistant to CMAS attack than other current oxide coating materials including yttria-stabilized zirconia and ytterbium disilicate.

AB - Multicomponent rare earth oxides (MROs) are potential environmental barrier coating (EBC) candidate materials for protection of Nb-base refractory alloys in aero-turbine hot section combustion applications. The ability of MROs to withstand reactions with siliceous debris such as calcia-magnesia-alumino-silicate (CMAS) ingested into the hot-section of the turbine engine is a key requirement for EBCs. In this study, reactions of two MRO compositions with CMAS were studied at 1500 °C for times between 1 h and 100 h. (Y0.33Yb0.33Er0.33)2O3 and (Y0.2Yb0.2Ero.2Ho0.2Nd0.2)3O2 both reacted with molten CMAS to form barrier layers of cuspidine (Ca,RE)4(Al,Si)2O9 and apatite Ca2RE8(SiO4)6O2 phases. Apatite phases crystallized rapidly and were promoted by inclusion of Nd2O3 as a constituent of the MRO. MROs proved to be significantly more resistant to CMAS attack than other current oxide coating materials including yttria-stabilized zirconia and ytterbium disilicate.

KW - CMAS

KW - Environmental barrier coatings

KW - Rare earth

KW - Thermal barrier coatings

UR - https://www.scopus.com/pages/publications/105035912362

U2 - 10.1016/j.mtla.2026.102740

DO - 10.1016/j.mtla.2026.102740

M3 - Article

AN - SCOPUS:105035912362

SN - 2589-1529

VL - 46

JO - Materialia

JF - Materialia

M1 - 102740

ER -

Multicomponent rare earth oxide stability against high temperature CMAS exposures

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Keywords

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