Search Results - "Opila, 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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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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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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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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Water Vapor-Mediated Volatilization of High-Temperature Materials by Meschter, Peter J, Opila, Elizabeth J, Jacobson, Nathan S

“…Volatilization in water vapor-containing atmospheres is an important and often unexpected mechanism of degradation of high-temperature materials during…”
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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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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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Variation of the Oxidation Rate of Silicon Carbide with Water-Vapor Pressure by Opila, Elizabeth J.

“…Chemically vapor deposited silicon carbide (CVD SiC) was oxidized at temperatures of 1000°‐1400°C in H2O/O2 gas mixtures with compositions of 10‐90 vol% water…”
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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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Computational and Experimental Study of Thermodynamics of the Reaction of Titania and Water at High Temperatures by Nguyen, Q. N, Bauschlicher, C. W, Myers, D. L, Jacobson, N. S, Opila, E. J

“…Gaseous titanium hydroxide and oxyhydroxide species were studied with quantum chemical methods. The results are used in conjunction with an experimental…”
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Evaluation of ultra-high temperature ceramics for aeropropulsion use by LEVINE, Stanley R, OPILA, Elizabeth J, HALBIG, Michael C, KISER, James D, SINGH, Mrityunjay, SALEM, Jonathan A

“…Among the ultra-high temperature ceramics (UHTC) are a group of materials consisting of zirconium diboride or hafnium diboride plus silicon carbide, and in…”
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A method for assessing the volatility of oxides in high-temperature high-velocity water vapor by Golden, Robert A., Opila, Elizabeth J.

“…A steam-jet furnace was utilized to assess the volatility of SiO2, TiO2 and Y2O3 in a simulated turbine engine environment. Specimens were exposed in the…”
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Oxidation of Carbon Fiber-Reinforced Silicon Carbide Matrix Composites at Reduced Oxygen Partial Pressures by Opila, Elizabeth J., Serra, Jessica L.

“…Carbon fibers (Polyacrylonitrile‐derived T‐300) and T‐300 carbon fiber‐reinforced silicon carbide composites (C/SiC) were oxidized in flowing 0.1 MPa reduced…”
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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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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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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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Thermodynamic modeling of the Hf-Ta-O system for the design of oxidation resistant HfC-TaC ceramics by Zaman, Rahim, Opila, Elizabeth J., Zhou, Bi-Cheng

“…An improved understanding of the oxidation resistance of HfC-TaC ultra-high temperature ceramics (UHTCs) is developed through modeling of the phase equilibria…”
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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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Composition dependence of oxidation resistance in high entropy ultra-high temperature ceramics by Backman, Lavina, Gild, Joshua, Qin, Mingde, Luo, Jian, Opila, Elizabeth J.

“…High entropy ultra-high temperature ceramics (HE-UHTCs) have garnered intense research interest due to the potential for optimized oxidation and mechanical…”
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