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Academic literature on the topic 'Titanium hydride'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 June 2024

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Journal articles on the topic "Titanium hydride"

1

Peddada, S. R., I. M. Robertson, and H. K. Birnbaum. "Hydride precipitation in vapor deposited Ti thin films." Journal of Materials Research 8, no. 2 (February 1993): 291–96. http://dx.doi.org/10.1557/jmr.1993.0291.

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Titanium hydrides having two different crystal structures were observed in α–Ti thin films grown epitaxially on sapphire substrates by e-beam physical vapor deposition. One of the hydrides (γ-hydride) had a face-centered tetragonal structure (c/a > 1) with an ordered arrangement of hydrogen atoms. The second hydride formed was the fcc δ-hydride. The γ-hydride grew as platelets in the α–Ti lattice with {10$\overline 1$0}Ti habit planes, whereas the γ-hydrides formed directly on the sapphire substrate parallel to the (0001)Ti. These hydrides are one of the principal causes of film decohesion.

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Morgan, Adam, Vahid Dehnavi, Dmitrij Zagidulin, David Shoesmith, and James J. Noël. "The Mechanism of Titanium Hydride Formation on Grade-2 Titanium." ECS Meeting Abstracts MA2023-02, no. 11 (December 22, 2023): 3372. http://dx.doi.org/10.1149/ma2023-02113372mtgabs.

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ASTM Grade-2 titanium (Ti-2) is a commercially pure grade widely used for its corrosion resistance in extreme environments. Therefore, Ti-2 has found applications within industries such as oil and gas, chemical processing, and nuclear power, where it is used for components such as reaction vessels, piping, and heat exchangers. Challenges with the fabrication process result in relatively high amounts of iron in commercial materials such as Grade-2, Grade-7, and Grade-12, which all have a maximum tolerance of 0.3 wt.% iron. The amount of iron present in titanium has been shown to have a significant effect on the microstructure and corrosion behaviour[1]. For example, Fe will precipitate and form TixFe intermetallic particles (IMPs) along grain boundaries if the local solubility limit is exceeded. Many of the corrosion processes (e.g., crevice corrosion) that determine the long-term integrity of Ti are strongly affected by the presence of IMPs[1]. Another detrimental corrosion scenario is the formation of titanium hydride (TiHx), which can precipitate on the surface and/or in the bulk material when the hydrogen concentration is high enough. Formation of TiHx phases increases the susceptibility of the metal to cracking, as the hydride is less ductile than the metal and its formation results in a strain-inducing volume increase within the matrix. Despite the proven importance of IMPs to the corrosion behaviour of Ti, and the detrimental effects of hydride formation on the material’s integrity, a direct relationship between IMPs and TiHx formation is not well established. There is some evidence that titanium hydride formation initiates at IMPs[2], but a complete mechanistic understanding is missing. In this study, the initiation and propagation mechanism of TiHx formation on Ti-2 is being investigated over a 24-hour period. Hydrides were grown galvanostatically in a simulated crevice corrosion environment. The surface was analyzed at various times using field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDX), focused ion beam (FIB) milling, and X-ray diffraction (XRD). By visualizing TiHx within the matrix using FE-SEM, we determined that titanium hydride formation initiates at IMPs and then grows both laterally and vertically around the IMP. After reaching a depth of ~ 4 µm below the surface of the IMP, the hydride stops growing vertically but continues to spread laterally across the Ti grain face until full surface coverage is reached. Finally, a steady-state condition is reached, in which hydride is present as a uniformly distributed layer across the surface with a thickness of ~ 4 μm. Additionally, the electrochemical potential values during the galvanostatic hydride growth process and the amount of hydride detected using XRD both support the hypothesis of the hydride growing rapidly before reaching a limited thickness. [1] X. He, J. J. Noël, D. W. Shoesmith, Corrosion 2004, 60, 378–386. [2] Q. Tan, Z. Yan, H. Wang, D. Dye, S. Antonov, B. Gault, Scr. Mater. 2022, 213, 114640.

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Dong, Shucheng, Baicheng Wang, Yuchao Song, Guangyu Ma, Huiyan Xu, Dmytro Savvakin, and Orest Ivasishin. "Comparative Study on Cold Compaction Behavior of TiH2 Powder and HDH-Ti Powder." Advances in Materials Science and Engineering 2021 (July 26, 2021): 1–15. http://dx.doi.org/10.1155/2021/9999541.

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The compaction mechanism of titanium hydride powder is an important issue because it has a direct impact on density and strength of green compacts and ultimately on the physical and mechanical properties of a final sintered products. In this paper, the characteristics and compaction behavior of titanium hydride and hydrogenation-dehydrogenation titanium powders are comparatively studied and analyzed for better understanding of compaction mechanism of brittle low-strength titanium hydride. The results indicate that the particles of titanium hydride powder are easily crushed under compaction loading at relatively low pressure well below compression strength of bulk titanium hydride, the degree of particle crushed increases with the increase of pressure. The compaction behavior of titanium hydride powder mainly includes the rearrangement and crushing of particles in the early compaction stage, minor plastic deformation, if any, and further rearrangement of particle fragments with filling the pores in the later stage. Such compaction behavior provides relative density of green hydride compacts higher than that for titanium powder of the same size. The relatively coarse titanium hydride powder with wide particle size distribution is easier to fill the pores providing highest green density.

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Pavlenko, Vyacheslav Ivanovich, Andrey Ivanovich Gorodov, Roman Nikolayevich Yastrebinsky, Natalia Igorevna Cherkashina, and Alexander Alexandrovich Karnauhov. "Increasing the Adherence of Metallic Copper to the Surface of Titanium Hydride." ChemEngineering 5, no. 4 (October 25, 2021): 72. http://dx.doi.org/10.3390/chemengineering5040072.

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Studies have been carried out to increase the adhesive interaction between a titanium hydride substrate and a copper coating. An additional layer containing chemically active groups was created on the surface of the spherical titanium hydride by chemisorption modification. This paper discusses the results of scanning electron microscopy (SEM) using energy-dispersive X-ray spectroscopic mapping of coatings obtained on spherical granules of titanium hydride before and after adsorption modification. The mechanism of interaction of the surface of spherical granules of titanium hydride and titanium sulfate salt is proposed. It is shown that the creation of a chemisorbed layer of hydroxotitanyl and the subsequent electrodeposition of metallic copper contribute to the formation of a multilayer shell of a titanium–copper coating on the surface of spherical titanium hydride granules (≡Ti-O-Cu-) with a high adhesive interaction. Results have been given for an experimental study of the thermal stability of the initial spherical granules of titanium hydride and granules coated with a multilayer titanium-copper shell.

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CONFORTO, Egle, and Xavier FEAUGAS. "A Review of Hydride Precipitates in Titanium and Zirconium Alloys: Precipitation, Dissolution and Crystallographic Orientation Relationships." MATEC Web of Conferences 321 (2020): 11042. http://dx.doi.org/10.1051/matecconf/202032111042.

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This work proposes a review of recent results on the formation and dissolution of hydrides in HCP alloys (Ti and Zr alloys) correlated to the nature of crystallographic hydride phases and their ORs. The crystallographic coherence observed between the surface hydride layer and the substrate is very important for many applications as for biomaterials devices. Five particular orientation relationships (OR) were identified between titanium/zirconium hydride precipitates and the oc-Ti and a-Zr substrates. In addition, the nature of hydrides have a large implication on the ductility, the strain hardening, and the local plastic strain accommodation in the Ti alloys. Our studies using XDR, TEM and SEM-EBSD have been demonstrating that the nature of the hydride phase precipitates depends on the hydrogen content. DSC has been used to obtain the hydride dissolution and precipitation energy values at the bulk scale, whose difference can be associated to misfit dislocations. Local in-situ TEM dissolution observations show the depinning of part of misfit dislocations during dissolution process. Hydride reprecipitation is thus possible only if hydrogen is not driven away during heating by misfit dislocations depinning.

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Conforto, Egle, Stephane Cohendoz, Cyril Berziou, Patrick Girault, and Xavier Feaugas. "Formation and Dissolution of Hydride Precipitates in Zirconium Alloys: Crystallographic Orientation Relationships and Stability after Temperature Cycling." Materials Science Forum 879 (November 2016): 2330–35. http://dx.doi.org/10.4028/www.scientific.net/msf.879.2330.

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Hydride precipitation due to the spontaneous and fast hydrogen diffusion is often pointed as causing embrittlement and rupture in zirconium alloys used in the nuclear industry. Transmission Electron Microscopy (TEM) and X-Rays Diffraction (XRD) have been used to study the precipitation of hydride phases in zirconium alloys as a function of the hydrogen content. The orientation relationships observed between the hydride phase and the substrate were similar to those previously observed in Titanium hydrides grown on Titanium. Dislocation emission from the hydride precipitates has been directly related to the relaxation of the misfit stresses appearing during the transformation. The stability of the hydride phases after several dissolution-reprecipitation cycles have been studied by DSC, TEM and XRD for different total hydrogen content in several alloys. The energy of precipitation observed is lower than that of the dissolution in each case studied. The temperature associated with these two processes slightly increase as a function of the cycle number, as a result of the homogenizing hydrogen distribution in the alloy bulk. The same hydrides phases present before cycling were also observed after 20 cycles. However, transition phases poorer in hydrogen than the dominant one may precipitate at the interface with the substrate. The evolution of these transitions phases with the temperature increase will be investigated by TEM in-situ heating in the next future.

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Rezaei Ardani, Mohammad, Sheikh Abdul Rezan Sheikh Abdul Hamid, Dominic C. Y. Foo, and Abdul Rahman Mohamed. "Synthesis of Ti Powder from the Reduction of TiCl4 with Metal Hydrides in the H2 Atmosphere: Thermodynamic and Techno-Economic Analyses." Processes 9, no. 9 (September 1, 2021): 1567. http://dx.doi.org/10.3390/pr9091567.

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Titanium hydride (TiH2) is one of the basic materials for titanium (Ti) powder metallurgy. A novel method was proposed to produce TiH2 from the reduction of titanium tetrachloride (TiCl4) with magnesium hydride (MgH2) in the hydrogen (H2) atmosphere. The primary approach of this process is to produce TiH2 at a low-temperature range through an efficient and energy-saving process for further titanium powder production. In this study, the thermodynamic assessment and technoeconomic analysis of the process were investigated. The results show that the formation of TiH2 is feasible at low temperatures, and the molar ratio between TiCl4 and metal hydride as a reductant material has a critical role in its formation. Moreover, it was found that the yield of TiH2 is slightly higher when CaH2 is used as a reductant agent. The calculated equilibrium composition diagrams show that when the molar ratio between TiCl4 and metal hydrides is greater than the stoichiometric amount, the TiCl3 phase also forms. With a further increase in this ratio to greater than 4, no TiH2 was formed, and TiCl3 was the dominant product. Furthermore, the technoeconomic study revealed that the highest return on investment was achieved for the production scale of 5 t/batch of Ti powder production, with a payback time of 2.54 years. The analysis shows that the application of metal hydrides for TiH2 production from TiCl4 is technically feasible and economically viable.

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Yastrebinsky, R. N., G. G. Bondarenko, V. I. Pavlenko, and A. A. Karnaukhov. "Diffusion-thermal phase transformations in titanium hydride containing a multi-quality system of hydrogen traps." Perspektivnye Materialy 6 (2021): 5–15. http://dx.doi.org/10.30791/1028-978x-2021-6-5-15.

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Diffusion-thermal phase transformations in a modified titanium hydride containing a multiparting system of hydrogen traps. Modification of titanium hydride was carried out by the method of layer-by-layer electrochemical precipitation of metallic titanium and copper from organic and inorganic solutions of their salts. The creation on the surface of the titanium hydride of a multilayer coating (Ti – Cu) obtained by the electrochemical precipitation method increases the thermal stability of the metal hydride system by 229.7 °C. Methods of X-ray-phase, X-ray structural and electron-probe microanalysis are shown, the constancy of the phase composition of the modified titanium hydride in the temperature range of 100 – 700 °C. The most essential defects of the crystal lattice in a modified titanium hydride occur at a temperature of 500 °C — due to the hydrogenation of the modification titanium shell and blocking the microcrack of the surface with a copper coating, the period of the elementary cell and the volume of the hydride phase crystal volume changes. The largest concentration of hydrogen in the surface layer (up to 87.9 %) occurs in the temperature range of 300 – 500 °C, which ensures the maximum density of defects in the crystal lattice. At 700 °C, a dislocation density decreases and a decrease in the crystal cell parameters associated with the annealing mode of titanium hydride and hydrogen thermal diffusion into the volume of material. A metallic titanium precipitated on the titanium hydride surface is an effective structural trap of hydrogen diffusing to surface layers during thermal heating, and the creation of an additional protective copper sheath prevents the thermal diffusion of hydrogen into the environment.

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Goren, S. D., C. Korn, H. Riesemeier, E. Rössler, and K. Lüders. "Titanium Knight shift in titanium hydride." Physical Review B 34, no. 10 (November 15, 1986): 6917–23. http://dx.doi.org/10.1103/physrevb.34.6917.

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Yastrebinskii, R. N., and A. A. Karnauhov. "Composition Material for Radiation Protection Based on Modified Disperse Titanium Hydride and Silicate Connecting." Solid State Phenomena 299 (January 2020): 163–68. http://dx.doi.org/10.4028/www.scientific.net/ssp.299.163.

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This paper presents an analysis of known radiation protection materials. The prospects of using materials based on titanium hydride are shown. The possibility of obtaining finely ground titanium hydride with a high content of atomic hydrogen in its structure has been established. The features of the physicochemical interaction of dispersed titanium hydride and heavy flint, after hydrolysis in the alkaline environment of the organosilicon modifier – tetraethoxysilane, are revealed. The possibility of obtaining a thermostable low-activated composite material based on dispersed titanium hydride for complex protection against neutron and gamma radiation has been established. The structure of the obtained composite was investigated.

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Dissertations / Theses on the topic "Titanium hydride"

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Hurysz, Kevin Michael. "The processing of titanium hydride powders into uniform hollow spheres." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/19502.

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Sakaguchi, Tatsunori. "Synthesis and Characterization of Titanium Perovskite Oxyhydrides Prepared by Topochemical Hydride Reduction." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/215561.

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Hardwicke, Canan Uslu. "Processing and properties of Ti-6A1-4V hollow sphere foams from hydride powder." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/19650.

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Mariani, Laura Leana. "Electroless coatings on titanium hydride for use in the production of aluminum foam." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99525.

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Aluminum foam is a porous form of solid aluminum. One method of producing aluminum foam is the powder metallurgy process. Aluminum powder is mixed with a foaming agent, generally titanium hydride (TiH2), and pressed to form a compact. In the foaming process, the compact is heated and hydrogen gas is released from the agent to form bubbles within the surrounding aluminum. However, there is a significant gap between the onset of the decomposition temperature of the TiH2 (400°C) and the melting point of aluminum (660°C). The hydrogen gas evolution begins while the aluminum is still solid, creating an accumulation of gas pressure which eventually causes microfissures inside the matrix. As a result, the final structure has interconnected pores and inferior properties.
This problem may be overcome by delaying the temperature of hydrogen evolution so that it coincides with the melting point of aluminum. Coating the titanium hydride with copper or nickel can create a kinetic barrier that retards the flow of hydrogen into the surrounding matrix.
Electroless plating is a process that can be used to deposit metallic coatings on non-conductive materials. Metallic ions in solution are reduced by a suitable agent, creating a metal deposit on the substrate. The process is autocatalytic and continues until all the metallic ions are consumed.
The objective of this work was to investigate the effect of the copper and nickel coatings on the hydrogen evolution of titanium hydride powders. It was found that the metal coatings do tend to delay the temperature of gas release and that this could potentially be used to improve the foaming process.

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Danielsson, Mathias. "Spectroscopic study of titanium monohydride and storage ring experiments." Doctoral thesis, Stockholm : Physics Department, Stockholm University, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-7451.

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Wang, Qian. "Crystallographic analysis of hydride phase transformation and its effect on mechanical property of commercial pure titanium." Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0034.

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La nucléation et la formation d'hydrures jouent un rôle important sur la durée de vie des alliages de Ti. Dans ce travail, la transformation d’hydrure en fonction de l’orientation cristalline dans le titane commercial pur est étudiée expérimentalement et théoriquement. Les deux relations d'orientation dominantes (OR) de la transformation des hydrures obtenus par une méthode de chargement électrolytique de l'hydrogène sont {0001} // {001} <12̅10> // <110> avec le plan d’interface (OR1) et {0001} // {11̅1} <12̅10> // <110> avec le plan d’interface de {101̅3} // {11̅0} (OR2). Les orientations des grains avec des plans d'interface {101̅0} ou {101̅3} parallèles à la surface de diffusion sont les plus favorables à la formation des hydrures ayant les OR1 et OR2, respectivement. Les variants d'hydrure avec un plan d'interface parallèle à la surface de diffusion sont choisis préférentiellement en raison de leur plus grande capacité d'adaptation à la déformation. L'axe c ou l'axe a parallèle à la direction de diffusion sont des orientations défavorables, en raison des interactions complexes entre les différents variants des hydrures. Les microstructures de la couche d'hydrure ont été caractérisées afin d'étudier les mécanismes d’accommodation lors de la transformation des hydrures. Des mécanismes d’accommodation plastique sont nécessaires à l'intérieur de la couche d'hydrure. Des macles d'extension {101̅2} et de contraction {112̅2} sont induits à l’interface des platelets d’hydrure OR2. Le variant de macle sélectionnée a la plus grande capacité d'accommodation de la distorsion locale lors de la nucléation des hydrures. Les macles {101̅2} sont transformées en macles {101̅1} afin de poursuivre la croissance des platelets d'hydrure. La microstructure des hydrures dans la section transversale de la couche d'hydrure a été observée. Les interactions des différentes variants d'hydrure relaxent la déformation anisotrope à l'intérieur de la couche. La paire d'hydrures intergranulaires est un autre comportement d'accommodation pendant l'hydrogénation. Ce mécanisme se forme sur des joints à faible désorientation (< 30o) et à forte désorientation (75o< θc < 85o). Les propriétés mécaniques de la surface du titane modifiée par le chargement en hydrogène a été étudiée par nanoindentation et en traction. Après l'hydrogénation, la dureté augmente tandis que le module élastique diminue en raison de la formation d'hydrures. La dureté dépendant de l'orientation de l'hydrure δ- formé après 168 h de charge est moins sensible que celle de α-Ti. La valeur HIT moyenne de l'hydrure δ est de 3.8 ± 0.3 GPa, ce qui est supérieur à la matrice de titane (2.8 ± 0.3 GPa). L’hydrure est plus dur que la matrice. En traction, la couche d'hydrure est peu déformable. Des interactions entre les dislocations et les macles se produisent pour les platelets OR2. On observe que du glissement prismatique traverse les hydrures et que les hydrures limitent la croissance et l’élargissement des macles de tension {101̅2}
Nucleation and formation of hydride precipitates are important factors on limiting the lifetime of Ti alloys. In this work, the hydride phase transformation in commercial pure titanium is thoroughly investigated by experimental and theoretically crystallographic method. The two dominant orientation relationships (ORs) of hydride transformation by the method of electrolytic hydrogen charging are {0001} //{001} <12̅10>//<110> with interface plane of {101̅0}//{11̅0} (OR1) and {0001}//{11̅1} <12̅10>//<110> with interface plane of {101̅3}//{11̅0} (OR2). The grain orientations of {101̅0} or {101̅3} interface planes parallel to the diffusion surface are most favorable for OR1 and OR2 hydride transition, respectively. The hydride variants with interface plane parallel to the diffusion surface is preferentially selected because of the highest capacity for strain accommodation. The c-axis or a-axis parallel to the diffusion direction are unfavorable orientations, due to the complicated interactions between different hydride variants. The multi-dimensional microstructures of hydride layer were characterized to investigate the accommodation mechanisms for hydride transformation. Plastic accommodation behaviors are necessary inside hydride layer. Both {101̅2} extension and {112̅2} contraction twins are induced at the interface of OR2 hydride platelets. The selected twin variant has the highest accommodation capacity for local distortion of hydride nucleation. The {101̅2} twins are transformed into {101̅1} twins in order to the further growth of hydride platelet. Hydride microstructure on the cross section of hydride layer were observed for the first time, the interactions of different hydride variants relax the anisotropic misfit strain inside hydride layer. The intergranular hydride pair is another accommodation behavior during hydrogenation, which prefer to be formed at the grain boundary with both low angle (< 30o) and high angle (75o< θc < 85o) boundaries. The mechanical property of titanium surface changed by hydrogen charging was investigated by nanoindentation tests and tensile deformation tests. After hydrogenation, the nanohardness increases while elastic modulus decreases due to the formation of hydride precipitation. The orientation dependent hardness of δ-hydride formed after 168 h charging is less sensitive than that of α-Ti. The average HIT value of δ-hydride is 3.8 ± 0.3 GPa, which is higher than titanium matrix (2.8 ± 0.3 GPa) showing the hard nature of hydride phase. During tensile deformation, hydride layer shows a poor deformability, but the interactions between dislocations and twins occur for OR2 hydride platelets: the transmissions of prismatic slips into hydride precipitations and the hindering of hydrides on the growth and thickening of {101̅2} tension twins

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Proa, Flores Paula Mercedes. "Aluminium foams fabricated by the PM route using nickel- coated titanium hydride powders of controlled particle size." Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:8881/R/?func=dbin-jump-full&object_id=92343.

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Epshteyn, Albert. "Synthesis, stability, and reactivity of high-oxidation-state pentamethylcyclopentadienyl acetamidinate [beta]-Hydride- or [beta]-Methide-bearing alkyl complexes of zirconium, titanium, and tantalum." College Park, Md. : University of Maryland, 2006. http://hdl.handle.net/1903/4249.

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Thesis (Ph. D.)--University of Maryland, College Park, 2006.
Thesis research directed by: Chemistry. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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Boulila, Sabrine. "Propriétés d’absorption de l’hydrogène sur un titane commercial pur Ti50A ayant subi du laminage à froid." Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0066.

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L’utilisation constante des hydrocarbures, les émissions de dioxyde de carbone et le réchauffement climatique font l’objet d’un débat mondial sur l’énergie. L’établissement d’une économie basée sur l’hydrogène se présente comme une solution alternative efficace. Différents problèmes technologiques sont à résoudre pour parvenir à un tel système énergétique mondial tel que la production de l’hydrogène, sa livraison et son stockage. Diverses méthodes de stockage de l’hydrogène sont disponibles. Parmi celles-ci, le stockage sous forme d’hydrures métalliques représente un moyen prometteur et pratique. Dans ce contexte, les techniques de déformation mécanique appliquées aux matériaux de stockage de l’hydrogène ont connu une utilisation accrue ces dernières années. Elles permettent l’amélioration des performances de stockage de l’hydrogène de divers types d’hydrures métalliques. Le présent travail se concentre sur l’effet de la déformation mécanique induite par la technique du laminage à froid sur les propriétés d’absorption de l’hydrogène du titane de pureté commerciale Ti50A. Pour ce faire, deux principaux paramètres de traitement ont été variés et étudiés lors du laminage à froid à savoir le taux de réduction et la vitesse de laminage. Dans un premier temps, une analyse et une compréhension des microstructures de déformation induites par la technique du laminage à froid sur le titane pur avant hydrogénation a été réalisée pour les différentes conditions de traitement mécanique. Ensuite, l’étude de l’effet du laminage à froid sur la première absorption de l’hydrogène du titane a été effectuée. Les échantillons hydrogénés ont été également examinés et l’hydrure de titane formé après hydrogénation complète a été caractérisé. Les résultats obtenus ont montré une amélioration significative de la cinétique de la première absorption de l’hydrogène pour les échantillons laminés à froid comparés à l’échantillon de titane pur non traité. L’étude paramétrique effectuée sur le titane Ti50A a montré que les paramètres de traitement par laminage à froid affectent grandement la cinétique de la première hydrogénation tout en conservant la capacité maximale d’absorption de l’hydrogène. L’augmentation du taux de réduction lors du laminage à froid permet l’amélioration de la cinétique d’hydrogénation, associée à une activation de la déformation par maclage pour les faibles taux de réductions et une diminution de la taille des grains de titane après laminage. De plus, il a été montré qu’une faible vitesse de laminage assure une meilleure cinétique d’absorption d’hydrogène, tout en présentant des microstructures caractérisées par une fraction importante des joints de faibles désorientations. Finalement, le mécanisme d’absorption de l’hydrogène par le titane Ti50A a été étudié à travers la détermination de l’étape limitante de la vitesse de la réaction d’absorption. Il s’est avéré que tous les échantillons laminés dans les différentes conditions suivent le mécanisme d’absorption régi par le modèle du volume contractant. Un échantillon de titane laminé a été sélectionné pour l’étude détaillée de la transformation de phase du titane vers l’hydrure de titane suite à l’absorption complète de l’hydrogène par le Ti50A. Cette étude a été effectuée en analysant et examinant des échantillons partiellement hydrogénés
The constant use of hydrocarbons, carbon dioxide emissions and global warming are the subject of a global energy debate. Establishing a hydrogen economy is considered as an effective alternative solution. Various technological problems have to be solved to achieve such a global energy system such as hydrogen production, delivery and storage. Various methods of storing hydrogen are available. Among these, storage in the form of metal hydrides represents a promising and practical means. In this context, mechanical deformation techniques applied to hydrogen storage materials have seen increased use these recent years. These techniques enable the improvement of the hydrogen storage performance of various types of metal hydrides. The present work focuses on the effect of mechanical deformation induced by the cold rolling technique on the hydrogen absorption properties of the commercial pure titanium Ti50A. To do this, two main processing parameters were varied and studied during cold rolling, namely the reduction rate and the rolling speed. First, an analysis and an understanding of the deformation microstructures induced by the cold rolling technique on pure titanium before hydrogenation was carried out for the different mechanical processing conditions. Then, the study of the effect of cold rolling on the first hydrogen absorption of titanium was carried out. The hydrogenated samples were also examined and the titanium hydride formed after complete hydrogenation was characterized. The obtained results showed a significant improvement in the kinetics of the first hydrogen absorption for the cold-rolled samples compared to the unrolled pure titanium sample. The parametric study performed on titanium Ti50A showed that the cold rolling processing parameters greatly affect the kinetics of the first hydrogenation while maintaining the maximum hydrogen absorption capacity. The increase in the reduction rate during cold rolling allows the improvement of the hydrogenation kinetics, associated with an activation of the twinning deformation for low reduction rates and a decrease in the size of the titanium grains after rolling. On the other hand, it has been shown that a low rolling speed ensures better kinetics of hydrogen absorption, while exhibiting microstructures characterized by a large fraction of low angle boundaries. Finally, the mechanism of hydrogen absorption by titanium was investigated through the determination of the rate limiting-step of the absorption reaction. It was revealed that all rolled samples under the different conditions follow the absorption mechanism governed by the contracting volume model. In addition, a sample of rolled titanium was selected for detailed study of the phase transformation of titanium to titanium hydride following complete uptake of hydrogen by Ti50A. This study was performed by analyzing and examining partially hydrogenated samples

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Jesus, Jailson de. "Elaboração e caracterização de biocompósitos de hidreto de titânio/fosfato tricálcico para aplicações biomédicas." Universidade do Estado de Santa Catarina, 2011. http://tede.udesc.br/handle/handle/1793.

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Titanium is one of the most used biomateriais in manufacturing dental implants, especially titanium grade 4. However, titanium is a bioinert material, i.e. the interface between titaiiiun-i and host bone is a simple interlocking bonding, which can iead to the loosening ofthe implant and the eventual failure of the implantation. Bone neoformation and long terrn stability can be achieved by using bioactive materiais. Tricalcium phosphate (TCP) is one of the best options among bioactive materiais, due to its chernical and crystallographic structure being similar to that of bone mineral. However, one ofits primary restrictions on clinical use as a ioad-bearing implant is its poor mechanical properties. A good combination of the bioactivity of TCP and the mechanical properties of titanium is considered to be a promising approach to fabricating more suitable biornedical materiais for load-bearing àpplications. Therefore, the aim of this study was to ~eve1op bioactive composites by powder metallurgy using titanium hydride and tricalciuin phosphate to enhance the biocompatibility and the osseointegratjon of dental irnplants. Titanium based composites were prepared from titanium hydride (TiH2) with 2.5, 5, 7.5 and 10% in volume of β-TCP. The TiH2 was provided by Centro Técnico Aeroespacial (CTA) with a mean particle sige of l5μm. The β-TCP was provided by Cerarnic Group from UDESC with particle size below 180 nm. The mixtures were prepared with alcohol and zirconia baus in a high energy mili for five hours, foilowed by drying in a rotating evaporator. The mixtures were then pressed at 15OMPa and sintered at 1200°C for 2 hours in either vacuum or argon atinosphere. The materiais were characterized by scanning eiectron microscopy, transmission electron microscopy, X-ray diffraction and thermal analysis. The decomposition of β-TCP occuned at approximately 1100°C leading to the formation of Ti, CaTiO3, TiO2 and TixPy phases for the composites sintered in argon. For the composites sintered in vacuum it was found the sarne phases, except rutile. The composites sintered in vacuurn were better sintered exhibiting higher densificatjon than those sintered in argon. A main crystal phase of calcium titanate with a needie-like morphology was observed in the porosity of the composites. This phase was found in higher amount in the composite sintered in argon because this material presented higher porosity. This morphology is related to the presence of pores, which allow the growth of calcium titanate on a free surface.
O titânio é um dos biomateriais mais utilizados na confecção de implantes dentários. Dentre os tipos de titânio comercialmente puro (Ti cp), o mais utilizado em implantologia é o da classe quatro. Porém, o titânio é um material bioinerte, ou seja, a fixação óssea sobre a sua superficie acontece por aderência biomecânica. Em materiais bioativos, a fixação ocorre por ligação físico- química. O TCP-13 é um politipo de fosfato de cálcio que desperta muito interesse na utilização em medicina e odontologia por causa da neoformação óssea, porém, as suas propriedades mecânicas são muito baixas, inviabilizando a sua utilização na forma pura. Muitos trabalhos têm sido relatados em que a junção do titânio e fosfatos tem contribuído no desenvolvimento de biomateriais compósitos com características bioativas. O presente trabalho teve por objetivo desenvolver compósitos bioativos ~por metalurgia do pó, utilizando hidreto de titânio / fosfato tricálcico, para melhorar a biocompatibilidade e a osseointegração de implantes dentários. Foram elaborados os compósitos a base de hidreto de titânio (TiH2) com 2,5; 5; 7,5 e 10% em volume de TCP-β. O TiH2 foi doado pelo Centro Tecnológico Aeroespacial (CTA), e apresentava granulometria média de 15 μm. O TCP-β foi fornecido pelo grupo de biomateriais cerâmicos da UDESC com tamanho de partícula inferior a 180 nm. As misturas foram elaboradas com álcool e esferas dé zircônia em moinho atritor de alta energia durante cinco horas, seguidas de secagem em evaporador rotativo. Em seguida as misturas foram compactadas uniaxialmente a frio em matriz cilíndrica e retangular sob pressão de 150 MPa. Os compactados foram sinterizados em atmosfera de argônio e a vácuo nas condições de 1200 °C, durante duas horas. Os materiais foram caracterizados por microscopia eletrônica de varredura, microscopia eletrônica de transmissão, difração de raios-X, e análise térmica pelos métodos de calorimetria diferencial e dilatometria. A decomposição do TCP-β ocorreu a aproximadamente 1100 °C resultando na formação de titanato de cálcio e fosfetos de titânio. As fases resultantes da sinterização em atmosfera de argônio foram Ti, CaTiO3, TiO2 e TixPy. As fases identificadas nos compósitos sinterizados a vácuo foram as mesmas com exceção do rutilo. O compósito sinterizado a vácuo apresentou urna densificação melhor que o sinterizado em argônio. A porosidade e o aparecimento de titanato de cálcio na forma de agulhas foram maiores nos compósitos sinterizados em atmosfera de argônio por causa da maior porosidade.

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Books on the topic "Titanium hydride"

1

Smith, L. S. A review of weld metal porosity and hydride cracking in titanium and its alloys. Cambridge: TWI, 1998.

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Book chapters on the topic "Titanium hydride"

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Reilly, J. J., and G. Sandrock. "Iron Titanium Hydride (FeTih1.94)." In Inorganic Syntheses, 90–96. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132531.ch18.

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XIA, Yang, Zhigang Zak FANG, Tuoyang ZHANG, Ying ZHANG, Pei SUN, and Zhe HUANG. "Deoxygenation of Titanium Hydride with Calcium Hydride." In Proceedings of the 13th World Conference on Titanium, 135–37. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119296126.ch20.

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Pavlenko, V. I., N. I. Bondarenko, R. N. Yastrebinsky, and Z. V. Pavlenko. "Surface Structure of Modified Titanium Hydride Fraction." In Lecture Notes in Civil Engineering, 141–47. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-20459-3_18.

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Christen, Dines. "Molecular constants of HTi X 4Φ titanium hydride." In Landolt-Börnstein - Group II Molecules and Radicals, 390–92. Berlin, Heidelberg: Springer Berlin Heidelberg, 2021. http://dx.doi.org/10.1007/978-3-662-62327-5_116.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of bis(phenyltetramethylcyclopentadienyl) titanium(III) hydride." In Magnetic Properties of Paramagnetic Compounds, 15. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-45972-0_3.

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Pavlenko, V. I., R. N. Yastrebinsky, Z. V. Pavlenko, and N. I. Bondarenko. "Features of Titanium Hydride Crystal Oxidation at Heat Treatment." In Lecture Notes in Civil Engineering, 53–58. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-81289-8_8.

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Kareev, Yu A., U. Tamm, I. S. Glushkov, E. Hutter, Yu G. Gendel, G. Müller, R. D. Penzhorn, and V. P. Novikov. "Deuterium Generation Dynamics from Titanium Foils in an Electric Pulsed Hydride Injector." In Hydrogen Materials Science and Chemistry of Metal Hydrides, 159–69. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-010-0558-6_17.

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Takasaki, Akito, Yoshio Furuya, Kozo Ojima, and Youji Taneda. "Hydride Dissociation and Hydrogen Evolution from Cathodically Charged Gamma-Based Titanium Aluminides." In Hydrogen Effects in Materials, 799–808. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118803363.ch69.

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Huez, J., A.-L. Helbert, I. Guillot, A. W. Thompson, and M. Clavel. "Influence of Hydride Precipitation on the Ductility of Titanium Under Stress Triaxiality." In Hydrogen Effects in Materials, 819–30. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118803363.ch71.

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Kadir, Ros Atikah Abdul, Ab Aziz Mohd Yusof, Kamarliah Kamardin, Nor Shamimi Shaari, Mahfuzah Zainudin, and Muhammad Hussain Ismail. "Mixing Behaviour of Nickel and Titanium Hydride Mixture for Injection Moulding Process." In Lecture Notes in Mechanical Engineering, 119–23. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-3179-6_22.

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Conference papers on the topic "Titanium hydride"

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Ishijima, Yasuhiro, Takafumi Motooka, Fumiyoshi Ueno, Masahiro Yamamoto, Gunzo Uchiyama, Jun’ichi Sakai, Ken’ichi Yokoyama, et al. "Hydrogen Absorption Behavior of Titanium Alloys by Cathodic Polarization." In 2013 21st International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icone21-16079.

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Titanium and Ti-5mass%Ta alloy has been utilized in nuclear fuel reprocessing plant material because of its superior corrosion resistance in nitric acid solutions. However, Ti alloy have been known to high susceptibility of hydrogen embrittlement. To evaluate properties of hydrogen absorption and hydrogen embrittlement of Ti alloys, cathodic polarization tests and slow strain rate tests (SSRT) under cathodic polarization were carried out. Results show titanium hydrides covered on the surface of metals and hydrides thickness were within 10μm. But hydride did not observed at inner part of metals. Ti and Ti-5%Ta did not show hydrogen embrittlement by SSRT under cathodic charging. These results suggested that Ti and Ti-5%Ta could absorb hydrogen. But hydrogen did not penetrate inner portion of the metals more than 10μm in depth because titanium hydrides act as barrier of hydrogen diffusion. It is considered that retardation of hydrogen diffusion hindered hydrogen embrittlement of Ti and Ti-5%Ta alloys.

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Radhwi, Haytham, Kevin Palm, Milos Dubajic, Muhammad Hanif, Santosh Shrestha, Jeremy Munday, and Gavin Conibeer. "Structural and Optical Properties of Nonstoichiometric Titanium Hydride, Vanadium Hydride and Zirconium Hydride as Hot Carrier Solar Cell Absorbers." In 2021 IEEE 48th Photovoltaic Specialists Conference (PVSC). IEEE, 2021. http://dx.doi.org/10.1109/pvsc43889.2021.9518423.

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Macziewski, Chad, and Daniel Bufford. "Exploring the Sub-Stoichiometric Titanium Hydride (δ-TiHx) Phase Space." In Proposed for presentation at the TMS 2022 Annual Meeting and Exhibition held February 27-March 3, 2022 in Anaheim, CA. US DOE, 2022. http://dx.doi.org/10.2172/2001877.

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Lodi, Lorenzo, Jonathan Tennyson, and Sergei Yurchenko. "MOLECULAR LINE LISTS FOR SCANDIUM AND TITANIUM HYDRIDE USING THE DUO PROGRAM." In 70th International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2015. http://dx.doi.org/10.15278/isms.2015.ta08.

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ROUSSETSKI, A. S., A. G. LIPSON, and V. P. ANDREANOV. "NUCLEAR EMISSIONS FROM TITANIUM HYDRIDE/DEUTERIDE INDUCED BY POWERFUL PICOSECOND LASER BEAM." In Proceedings of the 10th International Conference on Cold Fusion. WORLD SCIENTIFIC, 2005. http://dx.doi.org/10.1142/9789812701510_0048.

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Lovelace, B., A. W. Haberl, H. Bakhru, J. Dellavilla, Floyd D. McDaniel, and Barney L. Doyle. "Transmission ERD Depth Profiling of Hydrogen in Alpha-Gamma Phase Titanium Hydride." In APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY: Twentieth International Conference. AIP, 2009. http://dx.doi.org/10.1063/1.3120043.

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Kempf, B., and H. Burkhard. "Non Wetchemical Lift Off of Titanium Dry Etch Masks by Hydride Formation." In 1991 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 1991. http://dx.doi.org/10.7567/ssdm.1991.pb6-9.

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L., Franciska P., Aprilia Erryani, Dhyah Annur, and Ika Kartika. "The effect of thermal pre-treatment of titanium hydride (TiH2) powder in argon condition." In PROCEEDINGS OF THE 3RD INTERNATIONAL CONFERENCE ON MATERIALS AND METALLURGICAL ENGINEERING AND TECHNOLOGY (ICOMMET 2017) : Advancing Innovation in Materials Science, Technology and Applications for Sustainable Future. Author(s), 2018. http://dx.doi.org/10.1063/1.5030293.

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Stasiuk, Oleksandr, and Denys Oryshych. "Mechanical Energy Absorption Ability of Titanium Porous Structures Produced by Powder Metallurgy Approach." In International Young Scientists Conference on Materials Science and Surface Engineering. Karpenko Physico-Mechanical Institute of the NAS of Ukraine, 2023. http://dx.doi.org/10.15407/msse2023.071.

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Porous materials are very efficient in absorbing mechanical energy, for instance, in combined armor, in order to improve the anti-ballistic protection characteristics. In the present study, porous titanium-based structures were manufactured via powder metallurgy methods using titanium hydride (TiH2) powder, which provided activated sintering, owing to dehydrogenation. The emission of hydrogen and shrinkage of powder particles on dehydrogenation also added a potential to control the sintering process and create desirable porosities. TiH2 powder was sintered with additions of ammonium as pore holding removable agents. The microstructures and porosities of sintered dehydrogenated titanium with different concentration ammonium were comparatively studied. Mechanical characteristics were evaluated using compression testing with strain rates varying from quasi-static to high levels. All testing methods were aimed at characterizing the energy-absorbing ability of the obtained porous structures. The desired strength, plasticity and energy-absorbing characteristics of porous titanium based structures were assessed, and the possibilities of their application were also discussed.

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Blose, R. E. "Spray Forming Titanium Alloys using the Cold Spray Process." In ITSC2005, edited by E. Lugscheider. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2005. http://dx.doi.org/10.31399/asm.cp.itsc2005p0199.

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Abstract Development of new, low-cost methods for spraying near net shapes of Titanium and Titanium alloys is critical for many industries and applications. Direct fabrication technologies would have an impact on many industries because of the potential to quickly manufacture complex parts or additive features with minimal waste. However, currently used high temperature spray technologies (Lasform, thermal spray methods) involve melting and solidification. Each new layer starts out molten, then solidifies, and must eventually cool to room temperature. This report presents results of feasibility tests for development of a new method of direct fabrication of Ti alloy parts at near-net shapes (nns) using the Cold Spray process (CSP). Several Ti-6Al-4V powders including gas atomized, plasma atomized, and hydride dehydride were tested in these experiments. Feedstock powders were characterized for particle size distribution, morphology, chemical composition, hardness, and deposition efficiency. Coatings in thicknesses of 2 mm were sprayed for evaluation of microstructure, hardness, and porosity. Thick rectangular prisms (10 mm) were sprayed for machining tensile specimens. The material properties of as sprayed and post treated coatings by heat-treating and hot isostatic pressing (HIPing) on material properties was studied. Analysis showed that after HIPing the density of sprayed Ti-6Al-4V coupons is near 100% and material properties met or exceed those of wrought material.

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Reports on the topic "Titanium hydride"

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Mills, Bernice E. Calibration of Thermal Desorption System (TDS) Response to Hydrogen for Analysis of Titanium Subhydride and Titanium Hydride. Office of Scientific and Technical Information (OSTI), July 2013. http://dx.doi.org/10.2172/1113863.

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