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Meeting MS&T22: Materials Science & Technology
Symposium High Temperature Oxidation of Metals and Ceramics
Presentation Title Design of Ultra-high Temperature Ceramics for Oxidation Resistance
Author(s) Niquana Smith, Elizabeth Opila
On-Site Speaker (Planned) Niquana Smith
Abstract Scope Ultra-high temperature ceramics (UHTCs) are capable of withstanding extreme temperatures. Specifically, hafnium carbide (HfC) and tantalum carbide (TaC) have the highest melting points amongst UHTCs, however, rapid oxidation of these materials is a persistent problem. In this work, HfC, TaC, and nominally single phase (Hf,Ta)C mixtures were densified using spark plasma sintering. Oxidation exposures were conducted in a resistive heating system at 1400°C in 1% oxygen/argon for times up to 10 minutes. Scanning electron microscopy and energy dispersive spectroscopy were used to characterize the oxide morphology, composition, and to determine the oxide thickness. Oxide thickness results demonstrated that pure TaC oxidizes more rapidly than pure HfC. The resulting oxide of the mixed (Hf,Ta) carbides was denser and thinner compared to the end members. X-Ray diffraction analysis showed that the complex oxide Hf6Ta2O17 was the predominant oxide phase, contributing to the change in oxide morphology and reduced oxide thickness.

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Analysis and Simulation of Alkoxide Corrosion Occurring in Automotive Metals with Biofuels
Atomic Scale Dynamics of Initial Stage Copper Oxidation Using In Situ ETEM and Correlated DFT Simulations
Burst Behavior and Oxidation Resistance of Cr-coated Zircaloy-4 Accident Tolerant Fuel Cladding
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Effect of Pressure on High-temperature Corrosion of Ni Alloys in Supercritical CO2 Containing Impurities
Effects of Secondary Additions to Na2SO4 Deposits on High-Temperature Hot Corrosion
Environmentally Assisted Cracking of Nickel and Iron Based Alloys in Te-containing Molten Salts
Evaluating the Oxidation Behavior of 1300C Capable Nb-Si-based Alloys
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GE's Accident Tolerant Fuel Cladding: An Overview of Accident Scenario Testing
High-temperature High-velocity Water Vapor Exposures of Ytterbium-silicate Dual-phase Mixture Compositions
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High Temperature Oxidation Behavior of Equimolar NbTiZr
High Temperature Oxidation Behavior of Fe- and Ni-Based Alloys Fabricated by Additive Manufacturing
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Investigating Fifth Oxide Effect on CMXAS Glass Properties
Investigation of High Emittance, Oxidation Resistant Multi-Layer Coatings for Carbon/Carbon Composites for Hypersonic Application
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Oxidation and Erosion Implications of CMAS on Environmental Barrier Coatings
Rare-earth Monosilicate Interactions with Calcium-magnesium Aluminosilicate
Study of the Pre-oxidation Effect on Long-term Oxidation Properties of Porous Fe22Cr Alloy
The Effect of Pressure on the Oxidation of Steels in Direct-fired Supercritical CO2 Power Cycle Environments
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