Dehydrogenation of TiH2

Bhosle, V; Baburaj, E.G.; Miranova, M.; Saláma, K.

doi:10.1016/s0921-5093(03)00117-5

Cited by 198 publications

(129 citation statements)

References 4 publications

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“…Two endothermic peaks were detected, and it was reported that the hydrogen gas is released from TiH 2 at these peak-temperature ranges. 16) Judging from Fig. 10, the TiH 2 powder used in this research decomposed at around 500$600 C. Figure 11 shows the liquid phase fraction of pure aluminum, 6061Al alloy and Al-7Si alloy as a function of temperatures.…”

Section: Foaming Behavior Of 6061al and Al-7si Alloy Precursorsmentioning

confidence: 93%

Observation of Foaming Behavior for Rolled Sheet Precursors Made of Various Aluminum Powders

2011

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One of the practical applications of porous aluminum is the core material for panel/foam sandwich structures. To manufacture the foam/ panel sandwich structure by a powder processing route, a sheet type precursor is essential. Therefore, a foaming behavior of aluminum sheet precursor (pure Al, 6061Al and Al-7Si) was examined. The foaming behavior was examined by the projected area of a precursor recorded by two video cameras from horizontal (lateral-side observation) and vertical (top-surface observation) directions. Average diameters and vertical/ horizontal Feret diameter ratios were used to evaluate pore morphology. Free foaming behavior of the sheet type precursors was extremely unidirectional along the compression direction of the rolled precursor. With regard to pure aluminum and 6061Al precursors, the pore morphology at the early stage of foaming was extremely anisotropic (flat shape), while the pore morphology became spherical when the specimen reached to the maximum expansion. As for the Al-7Si precursors, such flat anisotropic pores were not observed even at the early stage of foaming.

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Section: Foaming Behavior Of 6061al and Al-7si Alloy Precursorsmentioning

confidence: 93%

Observation of Foaming Behavior for Rolled Sheet Precursors Made of Various Aluminum Powders

2011

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“…The heat-treated powder was composed entirely of Ti phase. Considering the XRD result and thermal decomposition behavior of TiH 2 reported in [9,10], it is suggested that the weight loss is mainly due to the evolution of H 2 resulting from the dehydrogenation of TiH 2 to metallic Ti. Figure 5 shows the SEM micrographs of porous Ti specimens with different size and content of PMMA spheres, sintered at 1100 • C for 2 h. It is observed that the pore size and shape were strongly dependent on the initial PMMA powders.…”

Section: Resultsmentioning

confidence: 99%

Fabrication Of Porous Ti By Thermal Decomposition And Sintering Of PMMA/TiH2 Powder Compact

Jeon¹,

Kim²,

Suk³

et al. 2015

Archives of Metallurgy and Materials

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Porous Ti with controlled pore structure was fabricated by thermal decomposition and sintering process using TiH 2 powders and Polymethylmethacrylates (PMMA) beads as pore forming agent. The beads sizes of 8 and 50 µm were used as a template for fabricating the porous Ti. The TiH 2 powder compacts with 20 and 70 vol% PMMA were prepared by uniaxial pressing and sintered for 2 h at 1100 • C. TGA analysis revealed that the PMMA and TiH 2 were thermally decomposed at about 400 • C forming pores and at about 600 • C into metallic Ti phase. The porosity increased with increase in the amount of PMMA addition. Also, the microstructure observation showed that the pore size and shape were strongly dependent on the PMMA shapes.

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“…Os outros picos endotérmicos a aproximadamente 581 °C e 650 °C correspondem à decomposição do TiH 2 [14,15]. Esses dois picos confirmam que a dehidrogenação do TiH 2 ocorre em duas etapas: decomposição do TiH 2 em TiH x (onde 0,7 < x < 1,1) a 581 °C, e do TiH x em α-Ti a 650 °C [14]. Nesse estudo, os materiais compactados foram sinterizados durante 2 horas.…”

Section: Calorimetria Diferencial De Varredura (Dsc) E Termogravimetrunclassified

Preparação e caracterização de um biocompósito obtido pela mistura de hidreto de titânio com nitrato de cálcio para implantes dentários

et al. 2016

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RESUMONeste trabalho foram realizados estudos sobre a fabricação de um biocompósito à base de titânio para implantes dentários a partir da mistura de pó de hidreto de titânio (92%) com nitrato de cálcio (8% em volume). O pó de hidreto de titânio foi adicionado na solução aquosa de nitrato de cálcio, dissolvido por agitação mecânica, e em seguida os precursores foram misturados e dispersados/homogeneizados por ultrassom. Posteriormente, a mistura foi secada em evaporador rotativo, compactada com 600 MPa à temperatura ambiente, desmoldada e sinterizada em alto vácuo a 1200 o C durante 2 horas. Foi analisada a microestrutrura e fases formadas, as propriedades mecânicas, a rugosidade da superfície, a porosidade aberta, a molhabilidade da superfície e a citotoxicidade do biocompósito. As fases identificadas após a sinterização foram α-Ti e CaTiO 3 . O limite de resistência em compressão, o módulo de Young (E) e o ângulo de contato do biocompósito diminuíram significativamente com relação ao hidreto de titânio puro sinterizado nas mesmas condições. O limite médio de resistência em compressão do hidreto de titânio foi de 1794,67 MPa e do biocompósito foi de 481,36 MPa. O módulo de Young e o ângulo de contato do hidreto de titânio e do biocompósito foram de aproximadamente 112 GPa e 94 graus, e de 75 GPa e 83 graus, respectivamente. A rugosidade de superfície foi da mesma ordem de grandeza entre os materiais e ficou aproximadamente entre 1,4 e 1,5 µm (Ra) e 1,4 e 1,9 µm (Ra e Sa), medidas com rugosímetro de contato e com microscópio confocal a laser, respectivamente. A porosidade aberta do biocompósito sinterizado foi de aproximadamente três vezes maior do que aquela do hidreto de titânio sinterizado. Nos ensaios de citotoxicidade a porcentagem de células viáveis do biocompósi-to foi superior àquela do controle negativo e àquela do hidreto de titânio sinterizado.Palavras-chave: titânio, nitrato de cálcio, biocompósito, implantes dentários. ABSTRACTA titanium-based biocomposite was prepared from titanium hydrate powder and calcium nitrate for dental implant applications. The minor precursor was added in the major precursor of titanium hydrate in the concentration of 8% in volume. Titanium hydrate was added in the calcium nitrate solution, previously dissolved by mechanical agitation in distilled water, and then mixed/homogenized by ultrasound. The mixture was dried in a rotating evaporator, pressed at 600 MPa at room temperature and vacuum sintered at 1200 o C during 2 hours. It was analyzed the microstructure and phases formed, the mechanical properties, the surface roughness, the open porosity, the surface wetness and cytotoxicity of the materials. The phases formed in the biocomposite after sintering were α-Ti and CaTiO 3 . The compressive strength, Young modulus (E) and contact angle of the biocomposite significantly decreased compared to the sintered titanium hydrate. The average compressive strength of the titanium hydrate was 1794,67 MPa and of the biocomposite was 481,36 MPa. The Young modulus and contact angle o...

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Dehydrogenation of TiH2

Cited by 198 publications

References 4 publications

Observation of Foaming Behavior for Rolled Sheet Precursors Made of Various Aluminum Powders

Observation of Foaming Behavior for Rolled Sheet Precursors Made of Various Aluminum Powders

Fabrication Of Porous Ti By Thermal Decomposition And Sintering Of PMMA/TiH2 Powder Compact

Preparação e caracterização de um biocompósito obtido pela mistura de hidreto de titânio com nitrato de cálcio para implantes dentários

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