| Full text | |
| Author(s): |
Hesse, Francini Aline Belz
[1]
;
Verissimo, Nathalia Carolina
[1]
;
Soyama, Juliano
[1]
;
Bertazzoli, Rodnei
[1]
Total Authors: 4
|
| Affiliation: | [1] Univ Estadual Campinas, Fac Engn Mecan, Rua Mendeleyev 200, BR-13083860 Campinas - Brazil
Total Affiliations: 1
|
| Document type: | Journal article |
| Source: | ADVANCED POWDER TECHNOLOGY; v. 32, n. 12, p. 4609-4620, DEC 2021. |
| Web of Science Citations: | 0 |
| Abstract | |
Copper and titanium oxides in the nano-size range show unique chemical and physical properties and thus have been intensively considered for novel and smart applications. In this work, oxide nanoparticles were prepared by high-energy ball milling of Ti-Cu alloys followed by a controlled oxidation process. Alloys of the Ti-Cu system Ti-50Cu, Ti-57Cu, and Ti-65Cu (in wt.%) prepared by arc melting were selected considering they provide different starting brittle intermetallic phases before milling. Microstructural investigation indicated that Ti-50Cu was composed of Ti2Cu and TiCu, while Ti-57Cu was single-phase TiCu. Ti-65Cu was dual-phase and consisted of Ti3Cu4 and Ti2Cu3. A mean particle size below 10 nm was achieved after high-energy ball milling for all compositions. The oxidation process was then investigated in two temperature ranges. At high oxidation temperatures of 700-800 degrees C, a complete oxidation took place leading to oxides TiO2-rutile and CuO in all alloys. However, at a low oxidation temperature (350 degrees C), partial oxidation occurred and different oxides were obtained. Ti-50Cu was the most promising alloy and led to a mix of TiO2 (rutile and anatase), CuO, Cu2O, and Ti3Cu3O. After long exposure to thermal oxidation, the resulting oxides remained in the nanometric range with a particle size distribution showing a D50 of approximately 6 nm. (c) 2021 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. This is an open access article under the CC BY-NC-ND license (http://creativecommons. org/licenses/by-nc-nd/4.0/). (AU) | |
| FAPESP's process: | 18/04564-0 - Powder metallurgy processing of titanium aluminide alloys |
| Grantee: | Juliano Soyama |
| Support Opportunities: | Regular Research Grants |