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Effect of high heating rate on thermal decomposition behaviour of titanium hydride (TiH2) powder in air

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Abstract

DTA and TGA curves of titanium hydride powder were determined in air at different heating rates. Also the thermal decomposition behaviour of the aforementioned powder at high heating rates was taken into consideration. A great breakthrough of the practical interest in the research was the depiction of the P H2-time curves of TiH 2 powder at various temperatures in air. In accordance with the results, an increase in heating rate to higher degrees does not change the process of releasing hydrogen from titanium hydride powder, while switching it from internal diffusion to chemical reaction. At temperatures lower than 600 °C, following the diffusion of hydrogen and oxygen atoms in titanium lattice, thin layers TiH x phase and oxides form on the powder surface, controlling the process. On the contrary, from 700 °C later on, the process is controlled by oxidation of titanium hydride powder. In fact, the powder oxidation starts around 650 °C and may escalate following an increase in the heating rate too.

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Authors and Affiliations

  1. Department of Materials Engineering, Faculty of Materials Engineering, University of Tabriz, P.O. Box 5166616471, Tabriz, Iran

    A RASOOLI & A AZARNIYA

  2. School of Metallurgy and Materials Engineering, Iran University of Science and Technology, P.O. Box 16844, Tehran, Iran

    M A BOUTORABI & M DIVANDARI

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  1. A RASOOLI
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  2. M A BOUTORABI
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  3. M DIVANDARI
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  4. A AZARNIYA
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Correspondence to A RASOOLI.

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RASOOLI, A., BOUTORABI, M.A., DIVANDARI, M. et al. Effect of high heating rate on thermal decomposition behaviour of titanium hydride (TiH2) powder in air. Bull Mater Sci 36, 301–309 (2013). https://doi.org/10.1007/s12034-013-0455-2

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  • DOI: https://doi.org/10.1007/s12034-013-0455-2

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