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Scanning electron microscopy, X-ray diffraction and thermal analysis study of the ▫$TiH_2$▫ foaming agent
Mandrino, Djordje, 1964-2021 ; Paulin, Irena ; Škapin, Srečo D.
The decomposition of commercially available TiH[sub]2 was investigated while performing different thermal treatments. TiH[sub]2 powder, which is widely used as a foaming agent, was heat treated at ...450 [compositum]C for various times, from 15 min. to 120 min. Scanning electron microscopy (SEM) images of the surfaces at different magnifications were obtained and interpreted. A Bragg-Brentano X-ray diffractometer was used to measure the X-ray diffraction (XRD) spectra on all five samples. A close examination of the diffraction spectra showed that for an as-received sample and samples undergoing the longest thermal treatment (1 and 2 h) these spectra can be explained as deriving from cubic TiH[sub]1.924, while for the other two samples they can beexplained as deriving from tetragonal TiH[sub]1.924. A constant-unit-cell-volume phase transition between the cubis and tetragonal phase in TiH[sub]{2-y}-type compounds had been described in the literature. The unit-cell parameters obtained from measured spectra confirm that within the measurement uncertainty the unit-cell volume is indeed constant in all five samples. Thermogravimetry (TG) and differential thermal analysis (DTA) measurements were performed on all the samples, showing that the intensity of the dehydrogenation depends on the previous treatment of the TiH[sub]2. After the thermal analysis XRD of the samples was performed again and the material was found to exhibit a Ti-like unit cell, but slightly enlarged due to the unreleased hydrogen.
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