Kinetics of thermal decomposition of titanium hydride powder using in situ high-temperature X-ray diffraction (HTXRD)

Sandim, Hugo Ricardo Zschommler; Morante, Bruno Vieira; Suzuki, Paulo Atsushi

doi:10.1590/s1516-14392005000300012

Cited by 87 publications

(46 citation statements)

References 11 publications

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“…The apparent activation energy calculated from the slope of the curve gives 74 kJ mole ) [5]. It is worth mentioning that the apparent activation energy of the dehidryding process may be related to other mechanisms and only its magnitude is reliable for purpose of comparison.…”

Section: N°of the Experimentsmentioning

confidence: 99%

Kinetics of thermal decomposition of niobium hydride

Gabriel

Brum

Candioto

et al. 2012

International Journal of Refractory Metals and Hard Materials

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Section: N°of the Experimentsmentioning

confidence: 99%

Kinetics of thermal decomposition of niobium hydride

Gabriel

Brum

Candioto

et al. 2012

International Journal of Refractory Metals and Hard Materials

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“…First, some experiments were conducted in argon atmosphere [32,33,35], which possibly causes the oxidation problem and may mislead the result. Moreover, other reports using vacuum atmosphere may result in instant information loss or delay due to the fact that XRD scanning required a long time (usually several minutes to one hour to achieve a complete scan) [31,34]. To our best knowledge, it is the first time using the neutron diffraction technique to in situ investigate the dehydrogenation process of TiH2.…”

Section: Dehydrogenation Processmentioning

confidence: 99%

An in situ Study of NiTi Powder Sintering Using Neutron Diffraction

Chen

Liss

Cao

2015

Metals

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This study investigates phase transformation and mechanical properties of porous NiTi alloys using two different powder compacts (i.e., Ni/Ti and Ni/TiH2) by a conventional press-and-sinter means. The compacted powder mixtures were sintered in vacuum at a final temperature of 1373 K. The phase evolution was performed by in situ neutron diffraction upon sintering and cooling. The predominant phase identified in all the produced porous NiTi alloys after being sintered at 1373 K is B2 NiTi phase with the presence of other minor phases. It is found that dehydrogenation of TiH2 significantly affects the sintering behavior and resultant microstructure. In comparison to the Ni/Ti compact, dehydrogenation occurring in the Ni/TiH2 compact leads to less densification, yet higher chemical homogenization, after high temperature sintering but not in the case of low temperature sintering. Moreover, there is a direct evidence of the eutectoid decomposition of NiTi at ca. 847 and 823 K for Ni/Ti and Ni/TiH2, respectively, during furnace cooling. The static and cyclic stress-strain behaviors of the porous NiTi alloys made from the Ni/Ti and Ni/TiH2 compacts were also investigated. As compared with the Ni/Ti sintered samples, OPEN ACCESSMetals 2015, 5 531 the samplessintered from the Ni/TiH2 compact exhibited a much higher porosity, a higher close-to-total porosity, a larger pore size and lower tensile and compressive fracture strength.

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“…Electropositive metals including Ti, Zr, Hf and Zn form strong compounds with a stoichiometic hydrogen composition and thus resulting metal hydrides shows a good thermal stability at room temperature. They are decomposed into pure metals and hydrogen gas by heating 10) and can be hydrogen sources for the reference materials. If the stoichoimetric compositions are considered, several weight percents of hydrogen are attainable with the metal hydrides.…”

Section: Introductionmentioning

confidence: 99%

Development of High Concentration References for Measuring Hydrogen Ingress into Steels

et al. 2014

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Hydrogen ingressed into steels has been treated as one of detrimental factors causing the hydrogeninduced damages or failures and its concentrations is generally measured by a hot extraction system calibrated with references. High concentration references above 50.00 wppm is proposed to solve the bottlenecks of conventional references such as thermal instability and lower hydrogen concentrations at room temperature; by varying a mixing amount of titanium hydride as a hydrogen source with its balancing iron bead, the synthesized reference has freely controlable hydrogen concentration and also showed a good thermal stability at room temperature. Hydrogen residue in the iron bead was controlled less than 0.13 wppm by an optimized procedure including wet cleaning and thermal soaking at 300°C for 3 minute. Hydrogen weight fraction in the titanium hydride was calculated by 0.04 based on the assumption of the stoichiometric composition (or TiH2). Hot extraction measurements and theoretical calculations of the hydrogen concentrations were done for the hydride-containing iron beads. Both data showed a good linear correlation each other and a validity of the proposed concept is confirmed emprically.

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Kinetics of thermal decomposition of titanium hydride powder using in situ high-temperature X-ray diffraction (HTXRD)

Cited by 87 publications

References 11 publications

Kinetics of thermal decomposition of niobium hydride

Kinetics of thermal decomposition of niobium hydride

An in situ Study of NiTi Powder Sintering Using Neutron Diffraction

Development of High Concentration References for Measuring Hydrogen Ingress into Steels

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