can zirconium carbide store hydrogen
Solid state reaction of zirconia with carbon
The solid–solid reaction between zirconia and carbon under flowing argon produces zirconium carbide via the intermediate formation of an oxycarbide ZrC 0.84 O 0.06. In the temperature range 1623–1823 K, its final transformation into carbide is slow. The reaction producing the oxycarbide obeys the kinetic law between the degree of …
Current research: Zirconium carbide – high-temperature material …
At Fraunhofer IKTS a technically practicable and inexpensive method to produce high-quality zirconium carbide ceramic materials has been developed. Due to its very high melting point (3540 °C) and its very low vapor pressure (<10 -6 mbar at 2000 °C), zirconium carbide (ZrC) is an outstanding high-temperature and high-vacuum material on par with the …
Fabrication and characterization of zirconium carbide (ZrC) …
Zirconium carbide (ZrC) nanofibers were fabricated by the electrospinning method and subsequent heat-treatment. The solution for electrospinning was prepared by dissolving zirconium acetyl acetonate and cellulose acetate in glacial acetic acid and 2,4-pentanedione as common solvents.
Chemical vapour deposition of zirconium carbide and silicon carbide …
Zirconium carbide and silicon carbide hybrid whiskers were codeposited by chemical vapour deposition using methyl trichlorosilane, zirconium chloride, methane and hydrogen as the precursors. The zirconium carbide and silicon carbide whiskers were characterized by scanning electron microscopy, energy dispersive X-ray …
Resilience of uranium mononitride/zirconium carbide composites and uranium-zirconium carbonitride in hot hydrogen …
Nuclear thermal rockets require fuels capable of withstanding flowing hydrogen propellant up to 3200 K. Presently, there has not been a fuel type that reliably operates at these conditions. A promising candidate anticipated to endure this demanding environment is a ceramic-ceramic composite comprising of uranium mononitride and zirconium carbide.
Zirconium Carbide
Abstract. Zirconium carbide (ZrC) possesses a combination of thermodynamic, thermal, and mechanical properties that are promising for nuclear fuel applications requiring high-temperature resistance and structural integrity. This chapter reviews the literature evaluating ZrC properties as affected by temperature, as well as across the wide range ...
Preparation of zirconium carbide foam by direct foaming method
Ultra light, highly porous, closed-cell structured ZrC foam can be produced in two steps. First, pre-ceramic foam is prepared by direct foaming of zirconia sol and phenolic resin. In the next step, the foamed green body is converted into ZrC foam after carbothermal reduction at 1600 °C under argon atmosphere.
Niobium Carbide
Carbon fine particles, having pore sizes below 0.7–4 nm and specific surface areas of 800–2000 m 2 g −1, can be extracted from the crystal lattice of carbides such as titanium carbide (TiC), silicon carbide (SiC), niobium carbide (NbC), zirconium carbide (ZrC), molybdenum carbide (Mo 2 C), boron carbide (B 4 C), and aluminum carbide (Al 4 C 3).
XPS STUDIES OF THE STABILITY OF A ZIRCONIUM CARBIDE FILM IN THE PRESENCE OF ZIRCONIUM OXIDE AND HYDROGEN …
The chemical state of zirconium element in the deposited Ti-Zr-V-Hf-Nb NEG film at 25 C is basically composed of the ZrO 2 with the 3d5/2 binding energy of 182.8 eV. 55, 56 As indicated in Fig. 8 ...
Hydrogen trapping and storage in the group IVB-VIB transition metal carbide…
Highlights. •. Hydrogen atoms have the strongest binding, or trapping, at the octahedral interstices of the near stoichiometric group IV-VB carbides. •. The group IVB carbides have the strongest trapping or binding energies of around −1 eV, relatively independent of carbon concentration. •.
XPS STUDIES OF THE STABILITY OF A ZIRCONIUM CARBIDE FILM IN THE PRESENCE OF ZIRCONIUM OXIDE AND HYDROGEN …
The carbide component showed no changes on heating to 425 C, on treating with a hydrogen plasma at room temperature, or on heating the resulting film to 425 C. The oxide layers do show characteristic changes, and this also contrasts with earlier observations for a zirconium sulphide film.
Thermodynamic Properties of ZrC0.95–0.99 Zirconium Carbide in …
Abstract Based on the heat capacity equations obtained earlier for crystalline (298.15–3840 K) and liquid (3840–5000 K) zirconium carbide with composition close to stoichiometric, we calculated the thermodynamic functions for ZrC0.95–0.99 at temperatures of 100 to 5000 K. Special attention is paid to the nature of the anomalous …
Materials | Free Full-Text | Zirconium-Modified Medium-Entropy Alloy (TiVNb)85Cr15 for Hydrogen …
In this study, we investigate the effect of small amounts of zirconium alloying the medium-entropy alloy (TiVNb)85Cr15, a promising material for hydrogen storage. Alloys with 1, 4, and 7 at.% of Zr were prepared by arc melting and found to be multiphase, comprising at least three phases, indicating that Zr addition does not …
First-principles study of the stability and diffusion properties of hydrogen in zirconium carbide …
Introduction Zirconium carbide (ZrC) is one of the well-known hard refractory ceramic materials due to its high melting point (∼3540 C), high thermal conductivity, good chemical stability, and superior mechanical properties at elevated temperatures, which has been ...
zirconium carbide zrc: Topics by Science.gov
2007-07-01. Zirconium carbide is being considered as a candidate for inert matrix material in composite nuclear fuel for Gas fast reactors due to its favorable characteristics. ZrC can be produced by the direct reaction of pure zirconium and graphite powders. Such a reaction is exothermic in nature.
Morphologies and growth mechanisms of zirconium carbide films …
Zirconium carbide films were grown on graphite slices by chemical vapor deposition using methane, zirconium tetrachloride, and hydrogen as precursors. The growth rate of zirconium carbide films as a function of temperature was investigated. The morphologies of these films at different temperatures were also observed by scanning …
Thermodynamic Analysis and Growth of Zirconium Carbide by Chemical Vapor Deposition …
Equilibrium calculations were used to optimize conditions for the chemical vapor deposition of zirconium carbide from zirconium halide + CxHy+H2+Ar system. The results show the CVD-ZrC phase diagram is divided into ZrC+C, ZrC and ZrC+Zr zones by C, Zr generating lines. For the same mole of ZrCl4 reactant, it needs higher …
Properties of Zirconium Carbide for Nuclear Fuel Applications
Comparison of neutronic aspects in high‐temperature gas‐cooled reactor using ZrC and SiC Triso particle with 50 and 100 MWt power. The use of zirconium carbide (ZrC) as a substitute for silicon carbide (SiC) has been proposed to improve the performance of coated particles for high‐temperature gas‐cooled reactor (HTGR) fuel.….
Vacuum plasma sprayed zirconium carbide coatings
Summary and conclusions An experimental study of the vacuum plasma spraying of zirconium carbide powder was conducted using a Taguchi fractional-factorial approach. The VPS carbide coating thicknesses, reflecting influences of spraying parameters, ranged from 178 to 279 Jim. Porosity of the coatings ranged from 1.02% to …
Understanding Hydrogen in Zirconium | Zirconium in the Nuclear …
Zirconium carbide can be fabricated in several ways. One method is carbothermic reaction of zirconia by graphite. This results in a powder. Densified ZrC can then be made by sintering the powder of ZrC at upwards of 2000 °C. Hot pressing of ZrC can bring down the sintering temperature and consequently helps in producing fine grained fully densified ZrC. Spark plasma sintering also has been used to produce fully densified ZrC.
World''s first Hydrogen Turbine Helicopter
Pochari Hydrogen''s CHP701 is the world''s first liquid hydrogen powered turbine helicopter. Development will begin in the early 2020s. Pochari Hydrogen utilizes hydrogen stored in "cryogenic" state in carbon fiber tanks lined with an aluminum liner to minimize permeation. The liquid hydrogen is pumped via a "cryopump" from the liquid ...
Synthesis of Highly Dispersed Zirconium Carbide
The product obtained appeared to be single-phase zir-conium carbide containing no more than 2 wt % impurities. The powder particles are aggregated (mean diameter 14.9–15.0 μm, specifi c surface area 1.5–1.7 m2 g–1). The oxidation of zirconium carbide starts at 480°С and is complete at 800°С. DOI: 10.1134/S107042721803014X.
Preparation and characterization of zirconium carbide nano …
Zirconium carbide (ZrC) manifests a face-centered cubic structure reminiscent of the NaCl type. ... The low polymer is bridged with hydrated ZrO 2 by hydrogen bonding, eventually forming a core-shell structure in which amorphous carbon wraps the ZrO 2 Fig. 4 ...
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