Evaluation of the reactivity of dense lanthanum‑gadolinium zirconate ceramics with Colima volcanic ashes

Bedoya-Trujillo, Ivan F.; Pérez, Sebastián; Guijosa-García, Cynthia Y.; Rivera-Gil, Marco A.; Naraparaju, Ravisankar; Zárate-Medina, Juan; Muñoz-Saldaña, Juan

doi:10.1016/j.surfcoat.2023.129825

Cited by 5 publications

(2 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…91, 197.42, 355.77, 481.11, 623.88 and 642.55 cm -1 correspond to the vibrational modes reported in m-ZrO2 [8]. Raman spectrum from m-ZrO2 and Ap show a mixture of bands corresponding to m-ZrO2, as above, and new bands at 401.49, 533.91, 731.75, 779.79 and 864.35 cm -1 , which correspond to the Ap vibrational modes [9,11]. This indicates that in the bottom zone of the reaction layers these two phases reprecipitate together.…”

Section: Resultsmentioning

confidence: 86%

Phase identification on infiltrated thermal barrier materials by 2D Raman spectroscopy

Bedoya Trujillo,

Herrera Rodríguez,

Perez-Bedoya

et al. 2023

Enhanced Spectroscopies and Nanoimaging 2023

Self Cite

View full text Add to dashboard Cite

Thermochemical degradation of thermal barrier coatings generated by the infiltration of siliceous debris at high temperatures is considered a serious threat by aircraft industry due to phase destabilization of the thermal barrier material induces changes on its properties. Most materials-based strategies to mitigate the infiltration aim to promote the reactive crystallization of phases such as apatite. In this work, 2D Raman spectroscopy was carried out over the cross sections of lanthanum-gadolinium zirconate ceramic samples infiltrated by Colima and Popocatepetl volcanic ashes at 1250 °C for 10 h to identify the phases reprecipitated after infiltration. Raman mappings showed the characteristic peaks and the distribution of reprecipitated phases such as rare-earth apatite, monoclic and tetragonal zirconia. Additionally, rare-earth zirconate ceramics were identified by the characteristic F2g band of the pyrochlore structure. At the reaction layer, two zones were observed. Zirconia phases reprecipitating right at the upper zone while rare-earth apatite reprecipitating at the lower zone. For apatite, the peak corresponding to stretching vibrations of Si-O tetrahedra shows shifting to higher wavenumber values as gadolinium content increases in the rare-earth zirconate infiltrated. The 2D Raman spectroscopy was very effective to observe the distribution of the reprecipitated phases in addition to correlate the influence of gadolinium in the formed apatite. A correlation between infiltration depth and bands were confirmed.

show abstract

Section: Resultsmentioning

confidence: 86%

Phase identification on infiltrated thermal barrier materials by 2D Raman spectroscopy

Bedoya Trujillo,

Herrera Rodríguez,

Perez-Bedoya

et al. 2023

Enhanced Spectroscopies and Nanoimaging 2023

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 infiltration behavior and reaction characteristics of Colima volcanic ashes on gadolinium zirconate coatings deposited by atmospheric plasma spraying

Bedoya-Trujillo,

Gutiérrez-Pérez,

Pérez

et al. 2024

emergent mater.

View full text Add to dashboard Cite

Volcanic ashes are considered a serious threat to the aircraft industry. At high temperatures, they inflict severe thermochemical damage to the typical 7 wt.% yttria-stabilized zirconia thermal barrier coatings that protect the aircraft turbine. There is a need to evaluate alternative materials with excellent resistance to infiltration of molten siliceous particles, such as gadolinium zirconate. In this work, free-standing thermal barrier coatings of gadolinium zirconate were manufactured by atmospheric plasma spraying, varying deposit parameters to obtain different relative densities to evaluate the infiltration of molten Colima volcanic ashes for 1 h and 10 h at 1250 °C. The infiltration depth and the reaction products resulting from each interaction, were studied by different characterization techniques. In general, the coatings show high resistance to the infiltration of the volcanic ashes, reaching infiltration depths between 50 µm and 80 µm after 10 h of infiltration time. In this sense, gadolinium zirconate coatings are excellent candidates against the infiltration of Colima volcanic ashes compared to the typical yttria-stabilized zirconia-based thermal barrier coatings.

show abstract

Evaluation of the reactivity of dense lanthanum‑gadolinium zirconate ceramics with Colima volcanic ashes

Cited by 5 publications

References 36 publications

Phase identification on infiltrated thermal barrier materials by 2D Raman spectroscopy

Phase identification on infiltrated thermal barrier materials by 2D Raman spectroscopy

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

High temperature infiltration behavior and reaction characteristics of Colima volcanic ashes on gadolinium zirconate coatings deposited by atmospheric plasma spraying

Contact Info

Product

Resources

About