Slow sintering in garnet‐containing Y and Gd zirconate–aluminate mixtures for thermal barrier coatings

Mixtures of rare‐earth zirconates and aluminates containing Y or Y + Gd that form a two‐phase garnet–fluorite mixture exhibit much slower sintering than pure fluorite at 1400°C. An equivalent Y‐free, Gd‐containing composition that forms a perovskite aluminate instead of garnet showed faster densific...

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Published in:Journal of the American Ceramic Society 2023-08, Vol.106 (8), p.4519-4525
Main Authors: Yu, Yueh‐Cheng, Godbole, Eeshani P., Berrios, Josselyne, Hewage, Nethmi, Poerschke, David L.
Format: Article
Language:English
Subjects:
Aluminates
Coatings
Densification
Fluorite
Gadolinium
Garnets
Mixtures
Perovskites
Porosity
rare‐earth oxides
sintering
Sintering (powder metallurgy)
Thermal barrier coatings
Zirconates
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cited_by cdi_FETCH-LOGICAL-c3371-414be186b44396225ccc9ec885715dc282183af2d627068648b78046220034693
cites cdi_FETCH-LOGICAL-c3371-414be186b44396225ccc9ec885715dc282183af2d627068648b78046220034693
container_end_page 4525
container_issue 8
container_start_page 4519
container_title Journal of the American Ceramic Society
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creator Yu, Yueh‐Cheng
Godbole, Eeshani P.
Berrios, Josselyne
Hewage, Nethmi
Poerschke, David L.
description Mixtures of rare‐earth zirconates and aluminates containing Y or Y + Gd that form a two‐phase garnet–fluorite mixture exhibit much slower sintering than pure fluorite at 1400°C. An equivalent Y‐free, Gd‐containing composition that forms a perovskite aluminate instead of garnet showed faster densification after the metastable garnet decomposes. At 1500°C, the Y‐free sample also showed the fastest initial sintering rate, whereas there was more divergence in the sintering rate for the samples containing Y + Gd. The zirconate–aluminate with equimolar Y + Gd shows the slowest densification at 1500°C and retains ∼25% porosity after 250 h. The results highlight possibilities for designing compliant thermal barrier coatings that can retain significant porosity at 1400°C or higher.
doi_str_mv 10.1111/jace.19121
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source Wiley-Blackwell Read & Publish Collection
subjects Aluminates
Coatings
Densification
Fluorite
Gadolinium
Garnets
Mixtures
Perovskites
Porosity
rare‐earth oxides
sintering
Sintering (powder metallurgy)
Thermal barrier coatings
Zirconates
title Slow sintering in garnet‐containing Y and Gd zirconate–aluminate mixtures for thermal barrier coatings
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