Authors:
Huiyan Xu (Jilin University, China),
Oleksandr Bondarchuk (International Iberian Nanotechnology Laboratory, Portugal),
Orest Ivasishin (G.V. Kurdyumov Institute for Metal Physics, Ukraine)
Abstract:
Titanium hydride (TiH2) powder is used in powder metallurgy for manufacturing of titanium alloys and composites. In such approach, atomic hydrogen evacuated from hydrogenated powder during the vacuum sintering positively affects crystal structure of titanium, provides improved densification and cleaning of powder surface. We comparatively investigate impurities at the surface of titanium hydride and titanium powders, including oxygen compounds (titanium oxides, H2O). The X-ray photoelectron spectroscopy (XPS) was deployed to assess the forms of oxygen in both powders and their transformations during vacuum heating up to 600oC to elucidate the effect of TiH2 dehydrogenation process on the powder cleaning. The mass spectroscopy was used to follow the gases evolved during the TiH2 annealing; content of oxygen, nitrogen and hydrogen in powder before and after dehydrogenation was analyzed. Annealing protocol has been established to achieve better cleaning of the TiH2 powders and reduced impurity content in the sintered titanium-based products.
DOI:
https://doi.org/10.59499/WP225367984