Oxidation behavior of low-cost CP-Ti powders for additive manufacturing via fluidization

•Fluidization was used to produce low-cost near-spherical Ti powders.•Oxides are overlapped distributed within the oxide layer in the Ti powder surface.•The underlying oxidation mechanism of the Ti powders was probed.•A model was established to verify the oxygen pick-up of powders during fluidizatio...

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Bibliographic Details
Published in:Corrosion science 2021-01, Vol.178, p.109080, Article 109080
Main Authors: Ding, Wangwang, Wang, Zhangwei, Chen, Gang, Cai, Wei, Zhang, Cong, Tao, Qiying, Qu, Xuanhui, Qin, Mingli
Format: Article
Language:English
Subjects:
Additive manufacturing
Cost-effective
Fluidizing
Fluidizing modification
Oxidation
Titanium
Titanium dioxide
Titanium oxides
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Summary:•Fluidization was used to produce low-cost near-spherical Ti powders.•Oxides are overlapped distributed within the oxide layer in the Ti powder surface.•The underlying oxidation mechanism of the Ti powders was probed.•A model was established to verify the oxygen pick-up of powders during fluidization. Gas-solid fluidization is an innovative route to produce cost-effective HDH CP-Ti powders for additive manufacturing. Herein, oxidation behavior of Ti powders after fluidization was investigated with a particular emphasis on the oxide layer in the powder surface. The oxide layer consists of TiO2, Ti2O3 and TiO with overlapping distributions, exhibiting an oxygen gradient from the outer powder surface to the oxide-Ti(O) interface. Underlying oxidation mechanisms of powders were uncovered by the analysis of kinetics and thermodynamics. A model was established to verify the oxygen pick-up of powders. This study is beneficial for the oxidation control of Ti powders during fluidization.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2020.109080