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Microstructural Characterization of Shrouded Plasma Sprayed Titanium Coatings


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Titanium and its alloys are often used for corrosion protection because they are able to offer a high chemical resistance against various corrosive media. In this paper, shrouded plasma spray technology was applied to produce titanium coatings. A solid shroud with an external
shrouding gas was used to plasma spray titanium powder feedstock with aim to reduce the oxide content in the as-sprayed coatings. The titanium coatings were assessed by optical microscope, scanning electron microscopy, X-ray diffraction, LECO combustion method and Vickers microhardness testing. The results showed that the presence of the shroud and the external shrouding gas led to a dense microstructure with a low porosity in the as-prayed titanium
coatings. The oxygen and nitrogen contents in the titanium coating were kept at a low level due to the shielding effect of the shroud attachment and the external shrouding gas. The dominant phase in the shrouded titanium coatings was mainly composed of α-Ti phase, which was very
similar to the titanium feedstock powders. The shrouded plasma sprayed titanium coatings had a Vickers microhardness of 404.2 ±103.2 HV

Item Type: Item presented at a conference, workshop or other event, and published in the proceedings
Uncontrolled Keywords: plasma spray, titanium coating
Subjects: T Technology > T Technology (General)
Divisions: Schools > Centre for Engineering and Industrial Design
Depositing User: Hong Zhou
Date Deposited: 16 Jun 2019 22:14
Last Modified: 21 Jul 2023 08:18

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