Interactions of Na2SO4 and yttrium-silicate environmental barrier coatings at 825°C

Kristyn Ardrey; Helge Heinrich; Elizabeth Opila

doi:10.1111/jace.19394

Interactions of Na₂SO₄ and yttrium-silicate environmental barrier coatings at 825°C

Kristyn Ardrey, Helge Heinrich, Elizabeth Opila

Surface Engineering and Tribology

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

1 Scopus citations

Abstract

Yttrium-silicates (Y₂Si₂O₇ and Y₂SiO₅) are candidate environmental barrier coating (EBC) materials for silicon carbide ceramic matrix composites (SiC-CMCs). These materials’ high-temperature, high-velocity steam, and siliceous debris resistance are well studied. However, Na₂SO₄-induced hot corrosion mechanisms are less understood. Free-standing atmospheric plasma sprayed Y₂Si₂O₇ and Y₂SiO₅ coupons were exposed to 2.5 mg/cm² of Na₂SO₄ at 825°C in 0.1% SO₂-O₂ (g). Scanning electron microscopy, X-ray diffraction, transmission electron microscopy, and inductively coupled plasma-optical emission spectrometry were used to identify a previously unknown damage mechanism. Water-soluble Y and Na-Y sulfates and oxysulfates formed in reaction with Na₂SO₄, causing significant damage to the yttrium-silicate EBCs materials.

Original language	English
Pages (from-to)	7776-7788
Number of pages	13
Journal	Journal of the American Ceramic Society
Volume	106
Issue number	12
DOIs	https://doi.org/10.1111/jace.19394
State	Published - Dec 2023

Funding

Special thanks to the Office of Naval Research (ONR), program manager Dr. David Shifler, for providing funding under grant number N00014‐18‐1‐2628 and the University of Virginia Nanoscale Materials Characterization Facility (NMCF) for characterization instrumentation.

Keywords

corrosion/corrosion resistance
environmental barrier coatings (EBC)
rare earths
silicates

Access to Document

10.1111/jace.19394

Cite this

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title = "Interactions of Na2SO4 and yttrium-silicate environmental barrier coatings at 825°C",

abstract = "Yttrium-silicates (Y2Si2O7 and Y2SiO5) are candidate environmental barrier coating (EBC) materials for silicon carbide ceramic matrix composites (SiC-CMCs). These materials{\textquoteright} high-temperature, high-velocity steam, and siliceous debris resistance are well studied. However, Na2SO4-induced hot corrosion mechanisms are less understood. Free-standing atmospheric plasma sprayed Y2Si2O7 and Y2SiO5 coupons were exposed to 2.5 mg/cm2 of Na2SO4 at 825°C in 0.1\% SO2-O2 (g). Scanning electron microscopy, X-ray diffraction, transmission electron microscopy, and inductively coupled plasma-optical emission spectrometry were used to identify a previously unknown damage mechanism. Water-soluble Y and Na-Y sulfates and oxysulfates formed in reaction with Na2SO4, causing significant damage to the yttrium-silicate EBCs materials.",

keywords = "corrosion/corrosion resistance, environmental barrier coatings (EBC), rare earths, silicates",

author = "Kristyn Ardrey and Helge Heinrich and Elizabeth Opila",

note = "Publisher Copyright: {\textcopyright} 2023 The Authors. Journal of the American Ceramic Society published by Wiley Periodicals LLC on behalf of American Ceramic Society.",

year = "2023",

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doi = "10.1111/jace.19394",

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T1 - Interactions of Na2SO4 and yttrium-silicate environmental barrier coatings at 825°C

AU - Ardrey, Kristyn

AU - Heinrich, Helge

AU - Opila, Elizabeth

PY - 2023/12

Y1 - 2023/12

N2 - Yttrium-silicates (Y2Si2O7 and Y2SiO5) are candidate environmental barrier coating (EBC) materials for silicon carbide ceramic matrix composites (SiC-CMCs). These materials’ high-temperature, high-velocity steam, and siliceous debris resistance are well studied. However, Na2SO4-induced hot corrosion mechanisms are less understood. Free-standing atmospheric plasma sprayed Y2Si2O7 and Y2SiO5 coupons were exposed to 2.5 mg/cm2 of Na2SO4 at 825°C in 0.1% SO2-O2 (g). Scanning electron microscopy, X-ray diffraction, transmission electron microscopy, and inductively coupled plasma-optical emission spectrometry were used to identify a previously unknown damage mechanism. Water-soluble Y and Na-Y sulfates and oxysulfates formed in reaction with Na2SO4, causing significant damage to the yttrium-silicate EBCs materials.

AB - Yttrium-silicates (Y2Si2O7 and Y2SiO5) are candidate environmental barrier coating (EBC) materials for silicon carbide ceramic matrix composites (SiC-CMCs). These materials’ high-temperature, high-velocity steam, and siliceous debris resistance are well studied. However, Na2SO4-induced hot corrosion mechanisms are less understood. Free-standing atmospheric plasma sprayed Y2Si2O7 and Y2SiO5 coupons were exposed to 2.5 mg/cm2 of Na2SO4 at 825°C in 0.1% SO2-O2 (g). Scanning electron microscopy, X-ray diffraction, transmission electron microscopy, and inductively coupled plasma-optical emission spectrometry were used to identify a previously unknown damage mechanism. Water-soluble Y and Na-Y sulfates and oxysulfates formed in reaction with Na2SO4, causing significant damage to the yttrium-silicate EBCs materials.

KW - corrosion/corrosion resistance

KW - environmental barrier coatings (EBC)

KW - rare earths

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