Search Results - "OPILA, Elizabeth J"

Stability of the Y2O3–SiO2 system in high‐temperature, high‐velocity water vapor by Parker, Cory G., Opila, Elizabeth J.

“…High‐temperature, high‐velocity water vapor (steam‐jet) exposures were conducted on Y2O3, Y2SiO5, Y2Si2O7, and SiO2 for 60 hours at 1400°C. Volatility of Y2O3…”
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High-temperature oxidation of yttrium silicides by Golden, Robert A., Opila, Elizabeth J.

“…Current silicon melt-infiltrated (SMI) ceramic matrix composites (CMCs) are limited by the melting temperature of silicon (1414 °C) and the volatility of the…”
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Oxidation and Volatilization of Silica Formers in Water Vapor by Opila, Elizabeth J.

“…At high temperatures, SiC and Si3N4 react with water vapor to form a SiO2 scale. SiO2 scales also react with water vapor to form a volatile Si(OH)4 species…”
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Observation of solid-state bidirectional thermal conductivity switching in antiferroelectric lead zirconate (PbZrO3) by Aryana, Kiumars, Tomko, John A., Gao, Ran, Hoglund, Eric R., Mimura, Takanori, Makarem, Sara, Salanova, Alejandro, Hoque, Md Shafkat Bin, Pfeifer, Thomas W., Olson, David H., Braun, Jeffrey L., Nag, Joyeeta, Read, John C., Howe, James M., Opila, Elizabeth J., Martin, Lane W., Ihlefeld, Jon F., Hopkins, Patrick E.

“…Materials with tunable thermal properties enable on-demand control of temperature and heat flow, which is an integral component in the development of…”
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Phase stability and tensorial thermal expansion properties of single to high‐entropy rare‐earth disilicates by Salanova, Alejandro, Brummel, Ian A., Yakovenko, Andrey A., Opila, Elizabeth J., Ihlefeld, Jon F.

“…Temperature limitations in nickel‐base superalloys have resulted in the emergence of SiC‐based ceramic matrix composites as a viable replacement for gas…”
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Part I: Theoretical predictions of preferential oxidation in refractory high entropy materials by Backman, Lavina, Gild, Joshua, Luo, Jian, Opila, Elizabeth J.

“…High entropy materials, which include high entropy alloys, carbides, and borides, are a topic of substantial research interest due to the possibility of a…”
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Part II: Experimental verification of computationally predicted preferential oxidation of refractory high entropy ultra-high temperature ceramics by Backman, Lavina, Gild, Joshua, Luo, Jian, Opila, Elizabeth J.

“…Refractory high entropy materials have garnered significant research interest due to their potential ability to fill a need in high temperature structural…”
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Alumina Volatility in Water Vapor at Elevated Temperatures by Opila, Elizabeth J., Myers, Dwight L.

“…The volatility of alumina in high‐temperature water vapor was determined by a weight loss technique. Sapphire coupons were exposed at temperatures between…”
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Predicting oxide stability in high-temperature water vapor by Opila, Elizabeth J, Jacobson, Nathan S, Myers, Dwight L, Copland, Evan H

“…Many oxide phases, either as structural ceramics or thermally grown scales on alloys or non-oxide ceramics, find application in high-temperature corrosive…”
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Silicon carbide fiber oxidation behavior in the presence of boron nitride by McFarland, Bohuslava, Opila, Elizabeth J.

“…The oxidation behavior of Sylramic SiC fibers without a boron nitride surface layer was compared to Sylramic iBN SiC fibers with a boron nitride surface layer…”
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Thermochemical stability of Y2Si2O7 in high‐temperature water vapor by Golden, Robert A., Mueller, Kendall, Opila, Elizabeth J.

“…The thermochemical stability of Y2Si2O7 was assessed in a high‐temperature high‐velocity water vapor environment to improve the understanding of the mechanisms…”
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Phase purity and evolution in sol–gel derived single component and multicomponent rare‐earth disilicates by Salanova, Alejandro, Opila, Elizabeth J., Ihlefeld, Jon F.

“…Rare‐earth disilicates are a focus of study for use as environmental barrier coatings in gas‐turbine engines. These coatings require thermomechanical and…”
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Thermomechanical and thermochemical stability of HfSiO4 for environmental barrier coating applications by Ridley, Mackenzie J., Opila, Elizabeth J.

“…Thermomechanical and thermochemical stability of hafnon (HfSiO4) was evaluated for application as an environmental barrier coating (EBC) candidate for SiC/SiC…”
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SiC Recession Caused by SiO2 Scale Volatility under Combustion Conditions: II, Thermodynamics and Gaseous-Diffusion Model by Opila, Elizabeth J., Smialek, James L., Robinson, Raymond C., Fox, Dennis S., Jacobson, Nathan S.

“…In combustion environments, volatilization of SiO2 to Si‐O‐H(g) species is a critical issue. Available thermochemical data for Si‐O‐H(g) species were used in…”
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Mixed phase ytterbium silicate environmental-barrier coating materials for improved calcium–magnesium–alumino-silicate resistance by Webster, Rebekah I., Opila, Elizabeth J.

“…Calcium–magnesium–alumino-silicate (CMAS) reaction and infiltration behavior were studied in phase pure and mixed phase ytterbium silicate…”
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High‐temperature Na2SO4 interaction with air plasma sprayed Yb2Si2O7 + Si EBC system: Topcoat behavior by Herweyer, Lucas A., Opila, Elizabeth J.

“…The high‐temperature interaction between ~2.5 mg/cm2 of Na2SO4 and an atmospheric plasma sprayed (APS) Yb2Si2O7 topcoat–Si bond coat system on SiC CMC…”
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Holistic comparison of environmental barrier coating material candidates through design of a figure of merit by Ridley, Mackenzie J., Pinnisi, Dominic J., Opila, Elizabeth J.

“…The first figure of merit for environmental barrier coating (EBC) materials was designed through a ranking system for material properties pertaining to…”
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Paralinear Oxidation of CVD SiC in Water Vapor by Opila, Elizabeth J., Hann Jr, Raiford E.

“…The oxidation kinetics of CVDSiC were monitored by thermogravimetric analysis (TGA) in a 50% H2O/50% O2 gas mixture flowing at 1.4 cm/s for temperatures…”
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Na2SO4 deposit‐induced hot corrosion of SiC fibers relevant for SiC CMCs by Herweyer, Lucas A., Opila, Elizabeth J.

“…Hi Nicalon, Hi Nicalon S, Sylramic, and Sylramic iBN SiC fibers were exposed to ~60 μg/cm2 of Na2SO4 in a 0.1% SO2/O2 gaseous environment for times between…”
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The effect of TiO2 additions on CaO–MgO–Al2O3–SiO2 (CMAS) crystallization behavior from the melt by Webster, Rebekah I., Opila, Elizabeth J.

“…Titania (TiO2) was introduced into a model calcium‐magnesium aluminosilicate (CMAS) glass in additions of 5‐20 wt%. The crystallization behavior of the…”
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