A5063567097- Advanced materials and composites
- Metal and Thin Film Mechanics
- High-Temperature Coating Behaviors
- Nuclear Materials and Properties
- Catalytic Processes in Materials Science
- Advanced Materials Characterization Techniques
- Nuclear materials and radiation effects
- Hydrogen embrittlement and corrosion behaviors in metals
- Advanced ceramic materials synthesis
- High Temperature Alloys and Creep
- Advanced Battery Materials and Technologies
- Corrosion Behavior and Inhibition
- Aerogels and thermal insulation
- Fusion materials and technologies
- Advancements in Battery Materials
- Catalysis and Oxidation Reactions
- Microstructure and Mechanical Properties of Steels
- Petroleum Processing and Analysis
- Teaching and Learning Programming
- Microstructure and mechanical properties
- Experimental Learning in Engineering
- Electron and X-Ray Spectroscopy Techniques
- Ferroelectric and Piezoelectric Materials
- Magnetic Properties and Applications
- Advanced Battery Technologies Research
University of Illinois Urbana-Champaign
2017-2024
Friedrich Schiller University Jena
2024
Yonsei University
2024
Carleton College
2024
University of Coimbra
2024
John Wiley & Sons (United States)
2022-2023
Hudson Institute
2022-2023
Moss Landing Marine Laboratories
2022-2023
University of California, Santa Barbara
2011-2014
Johns Hopkins University
2014
The temperature capability of yttria‐stabilized zirconia thermal barrier coatings (TBCs) is ultimately tied to the rate evolution “nontransformable” t ′ phase into a depleted tetragonal form predisposed monoclinic transformation on cooling. phase, however, has been shown decompose in small fraction time necessary phase. Instead, modulated microstructure consisting coherent array Y‐rich and Y‐lean lamellar phases develops early process, with mechanistic features suggestive spinodal...
The relationship between yttria concentration and the unit cell parameters in partially fully stabilized zirconia has been reassessed, motivated by need to improve accuracy of phase analysis upon decomposition t′ ‐based thermal barrier coatings. Compositions ranging from 6 18 mol% YO 1.5 were synthesized examined means high‐resolution X‐ray diffraction. Lattice determined using Rietveld refinement method, a whole‐pattern fitting procedure. revised empirical relationships fall within range...
Phase evolution accompanying the isothermal aging of free‐standing air‐plasma sprayed ( APS ) 7–8 wt% yttria‐stabilized zirconia (8 YSZ thermal barrier coatings TBC s) is described. Aging was carried out at temperatures ranging from 982°C to 1482°C in air. The high‐temperature kinetics phase metastable t′ into a mixture transformable Y‐rich (cubic) and Y‐lean (tetragonal) phases are documented through ambient temperature X‐ray diffraction XRD characterization. A Hollomon–Jaffe parameter...
Sputter deposited nanotwinned metal alloy films that possess exceptional properties attractive for next generation MEMS devices.
Abstract Water vapor condensation is a ubiquitous process in nature and industry. Over the past century, methods achieving dropwise using thin (<1 µm) hydrophobic “promoter” layer have been developed, which increases heat transfer by ten times compared to filmwise condensation. Unfortunately, implementations of limited due poor durability promoter coatings. Here, thin‐film utilizes not as surface, but rather confine condensate within porous biphilic nanostructure, nickel inverse opals...
The correlation between microstructural and phase evolution in aged, yttria‐partially‐stabilized zirconia, air plasma‐sprayed coatings is discussed. Freestanding with the dense, vertically cracked structure were isothermally aged at 1482°C (2700°F) air. Characterization of resulting microstructures was conducted using transmission electron microscopy, then compared a parallel analysis via synchrotron X ‐ray diffraction ( XRD ) described Part I. Additional context provided by related studies...
The mechanisms of phase destabilization upon aging the metastable t′ yttria‐stabilized zirconia ( YSZ ) are poorly understood, despite its broad application in thermal barrier coatings. To provide insight, synchrotron X‐ray diffraction XRD with a quadrupole lamp furnace is used to examine temperature response, including expansion and evolution, 9 mol% (8 wt%) YO 1.5 t′‐ 8 . equilibrated powders ranging from 0 18.4 also investigated better understand effect composition on anisotropy. T c/t...
Uniform densification of relatively thick (~7 mm) consolidated boron carbide plates at low temperatures (e.g. 1800°C) and facture toughness are two the primary challenges for further development applications. This work reports that these can be overcome simultaneously by adding 5 wt% alumina as a sintering aid. Nearly fully dense (97%), fine grained (B 4 C) samples were produced using spark plasma 1700°C above in B C‐5 Al 2 O 3 system. The matrix reacted to form an 6 BO (a mullite‐like...
Abstract Maintaining high surface area and porosity at temperatures is important when considering aerogels for use in thermal management systems. The mesoporous structure of results extremely low conductivity, making them lightweight, performance insulating materials. these properties requires innovative routes to suppress sintering pore collapse as rise. current work aims improve the stability yttria‐stabilized zirconia by addition a SiO 2 coating. functionalization hydroxyl groups...
Abstract Over the past years, our team has taken a concerted effort to integrate computational modules into courses across undergraduate curriculum, in order equip students with skills variety of contexts that span field Materials Science and Engineering. This proven sustainable during recent period online transition many courses, illustrating one benefits modules. The most addition set included visualization component was incorporated introductory freshman course for first time Fall 2019....
Tungsten is the material of choice for plasma-facing components in divertor region future plasma-burning tokamak fusion reactors. However, under low energy helium irradiation at elevated temperatures, significant surface morphology changes are expected, including pores, blisters, and fuzz. Dispersion-strengthened tungsten materials with small additions transition metal carbide dispersoids have been proposed as an alternative to pure tungsten, they shown enhanced thermomechanical properties...
New Na-ion conductors Na 0.5 La ZrO 3 and 0.25 Ba with expanded lattices were developed based on perovskite LLTO, successfully increasing the conductivities vs. unexpanded (Na,La)TiO by up to ∼50×.
Tungsten is the material of choice for plasma-facing components in divertor region future nuclear fusion reactors. Exposure to low-energy helium ion irradiation results microstructural changes as trapped at defects tungsten matrix. High-temperature exposure formation bubbles subsurface. Dispersion-strengthened materials are tungsten-based with added transition metal carbides alter impurity distribution and grain structure. In this work, thermal release from dispersion-strengthened...