Quantifying the efficiency of reactions between silicate melts and rare earth aluminate-zirconate T/EBC materials

Godbole, Eeshani P.; Hewage, Nethmi W.; Handt, Anette von der; Poerschke, David L.

doi:10.1016/j.jeurceramsoc.2023.05.009

Cited by 5 publications

(3 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Finally, these aluminatezirconate mixtures with RE:Zr ≥ 1 are more likely to have desirable characteristics for T/EBC applications, and facilitate comparison with results from prior studies related to that application. 38,46,47 In addition to the equimolar Gd, La, Nd, Yb, and Y (RE = GdLaNdYbY henceforth), mixed aluminate-zirconate compositions were formulated with equimolar mixtures of Gd and Y (RE = GdY) and Gd, Yb, and Y (RE = GdYbY). These combinations have average radii near the center of the garnet and monoclinic ranges, respectively, shown in Figure 1, and were selected to probe cation partitioning in these phases that are less stable in the RE = GdLaNdYbY mixture.…”

Section: Materials Selectionmentioning

confidence: 99%

“…The EPMA characterization of the RE = GdY and GdYbY samples used previously reported methods. 39,46 EPMA of samples with RE = GdLaNdYbY used a Cameca SX100/SXFive FE-EPMA with beam energy of 12 keV and Depending on the grain size and distribution, point measurements were made for between four and ten grains of each phase. Average compositions are reported; standard deviations were generally less than 0.3 mol% for each oxide but occasionally as high as 1 mol%, especially for smaller grains.…”

Section: Characterizationmentioning

confidence: 99%

See 1 more Smart Citation

Phase stability and cation partitioning in compositionally complex rare earth aluminates and aluminate‐zirconate mixtures

Yu,

Nachlas,

Poerschke

2023

J Am Ceram Soc.

Self Cite

View full text Add to dashboard Cite

Multi‐component oxides have received significant recent attention due to their potential for improved property tunability. In simple structures, compositionally complex oxides can be stabilized by increased configurational entropy, and are sometimes called ‘high entropy’ ceramics. In phases with multiple cation sublattices or complex stoichiometries, it is more difficult to achieve high configurational entropy. However, there is limited knowledge about the factors influencing stability and solubility limits in many systems. This study investigated the limits on the stability of rare earth (RE) aluminates containing mixtures of RE cations including Gd, La, Nd, Yb, and Y in cases where (i) a fixed RE:Al ratio attempts to constrain the material into a single‐phase aluminate or (ii) a two‐phase aluminate, and in equilibrium with RE zirconates that readily dissolve multiple RE3+. The results show that it is difficult to form single‐phase, equimolar mixed‐RE aluminates encompassing a range of RE3+ sizes. Instead, the RE3+ selectively partition into specific phases based on RE‐size trends in the constituent binary systems. The results are discussed in terms of the phase stability and cation partition trends, and potential applications.This article is protected by copyright. All rights reserved

show abstract

Section: Materials Selectionmentioning

confidence: 99%

Section: Characterizationmentioning

confidence: 99%

Phase stability and cation partitioning in compositionally complex rare earth aluminates and aluminate‐zirconate mixtures

Yu,

Nachlas,

Poerschke

2023

J Am Ceram Soc.

Self Cite

View full text Add to dashboard Cite

show abstract

“…5 However, a major drawback is their potential susceptibility to chemical "attack" (i.e., chemical reaction between lanthanide-based ceramics and silicate melts). [5][6][7][8][9][10][11][12][13] The interaction between a silicate melt and TBC/EBC is characterized by a (partial) dissolution of the coating and/or the leaching of specific elements from the coating into the melt. 14,15 Viscosity is the dominating melt property influencing the successive stages (e.g., spreading and infiltration) of the physical interaction of silicate melts and TBCs / EBCs, [15][16][17] while It also serves as an inverse proxy for the diffusivities of several major chemical components of these reacting systems.…”

Section: Introductionmentioning

confidence: 99%

Calcium–magnesium–aluminum‐silicate melt viscosities influenced by lanthanides, yttrium, and zirconium

Müller,

Dingwell

2024

J Am Ceram Soc.

View full text Add to dashboard Cite

Lanthanides (Ln2O3) and elements like Zr and Y find application in the highest temperature‐resistant thermal and/or environmental barrier coatings. Such coatings are routinely exposed to silicate particles (e.g., sand, dust, volcanic ash), leading to chemical reactions that degrade the coating. The dissolution of 13.5 wt.% Ln2O3 into a calcium–magnesium–aluminum‐silicate (CMAS) melt leads to a viscosity reduction for the light lanthanides, while viscosity increases toward heavier lanthanides. For Gd, Y, and Zr, various amounts up to 13.5 wt.% (Gd2O3, Y2O3, ZrO2) were added to the CMAS melt, showing a tendency of increased viscosity for low concentrations (2.5‐3 wt.%) and a decreasing viscosity for higher values of the added component.

show abstract

High-temperature corrosion of the Gd4Al2O9 ceramics exposed to calcium–magnesium–aluminum-silicate melts

Li,

Wang

et al. 2024

Corrosion Science

View full text Add to dashboard Cite

Quantifying the efficiency of reactions between silicate melts and rare earth aluminate-zirconate T/EBC materials

Cited by 5 publications

References 36 publications

Phase stability and cation partitioning in compositionally complex rare earth aluminates and aluminate‐zirconate mixtures

Phase stability and cation partitioning in compositionally complex rare earth aluminates and aluminate‐zirconate mixtures

Calcium–magnesium–aluminum‐silicate melt viscosities influenced by lanthanides, yttrium, and zirconium

High-temperature corrosion of the Gd4Al2O9 ceramics exposed to calcium–magnesium–aluminum-silicate melts

Contact Info

Product

Resources

About