Isothermal Oxidation Kinetics of Iron Powders Under Vapor Atmosphere
Semisteel is the byproduct of the titania slag smelting process of ilmenite concentrate with an electric furnace. To enhance the added value of semisteel, a centrifugal granulation–water curtain process was adopted to manufacture iron powders. The oxidation characteristics of granulated powders were...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-05-01
|
| Series: | Metals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4701/15/5/553 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850256936396652544 |
|---|---|
| author | Wenchao He Jian Chen Yin Deng Zhiming Yan |
| author_facet | Wenchao He Jian Chen Yin Deng Zhiming Yan |
| author_sort | Wenchao He |
| collection | DOAJ |
| description | Semisteel is the byproduct of the titania slag smelting process of ilmenite concentrate with an electric furnace. To enhance the added value of semisteel, a centrifugal granulation–water curtain process was adopted to manufacture iron powders. The oxidation characteristics of granulated powders were analyzed by thermogravimetry (TG), X-ray diffraction (XRD), and scanning electron microscopy (SEM). To obtain iron powders with high purity, the isothermal oxidation kinetics of pure iron powders under vapor atmosphere were studied. TG measurements of pure iron powders were conducted at 1073 K, 1173 K, and 1273 K using a humidity generating instrument and a thermal analyzer. The results indicate that the oxidation rate increases with the increasing temperature and decreasing powder size. The entire isothermal oxidation process of iron powders with different sizes (0.3 mm < d<sub>1</sub> < 0.35 mm, 0.4 mm < d<sub>2</sub> < 0.45 mm, and 0.5 mm < d<sub>3</sub> < 0.55 mm) comprises two stages. The first oxidation stage is controlled by chemical reaction; the second oxidation stage is controlled by both internal diffusion and chemical reaction. The activation energies and oxidation reaction rate equations of iron powders at different stages are calculated. |
| format | Article |
| id | doaj-art-4bcf96a258954cc3877f70433fdec68a |
| institution | OA Journals |
| issn | 2075-4701 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj-art-4bcf96a258954cc3877f70433fdec68a2025-08-20T01:56:32ZengMDPI AGMetals2075-47012025-05-0115555310.3390/met15050553Isothermal Oxidation Kinetics of Iron Powders Under Vapor AtmosphereWenchao He0Jian Chen1Yin Deng2Zhiming Yan3School of Metallurgy and Power Engineering, Chongqing University of Science and Technology, Chongqing 401331, ChinaSchool of Metallurgy and Power Engineering, Chongqing University of Science and Technology, Chongqing 401331, ChinaSchool of Metallurgy and Power Engineering, Chongqing University of Science and Technology, Chongqing 401331, ChinaWarwick Manufacturing Group, University of Warwick, Coventry CV4 7AL, UKSemisteel is the byproduct of the titania slag smelting process of ilmenite concentrate with an electric furnace. To enhance the added value of semisteel, a centrifugal granulation–water curtain process was adopted to manufacture iron powders. The oxidation characteristics of granulated powders were analyzed by thermogravimetry (TG), X-ray diffraction (XRD), and scanning electron microscopy (SEM). To obtain iron powders with high purity, the isothermal oxidation kinetics of pure iron powders under vapor atmosphere were studied. TG measurements of pure iron powders were conducted at 1073 K, 1173 K, and 1273 K using a humidity generating instrument and a thermal analyzer. The results indicate that the oxidation rate increases with the increasing temperature and decreasing powder size. The entire isothermal oxidation process of iron powders with different sizes (0.3 mm < d<sub>1</sub> < 0.35 mm, 0.4 mm < d<sub>2</sub> < 0.45 mm, and 0.5 mm < d<sub>3</sub> < 0.55 mm) comprises two stages. The first oxidation stage is controlled by chemical reaction; the second oxidation stage is controlled by both internal diffusion and chemical reaction. The activation energies and oxidation reaction rate equations of iron powders at different stages are calculated.https://www.mdpi.com/2075-4701/15/5/553iron powderisothermal oxidation kineticsvapor atmosphere |
| spellingShingle | Wenchao He Jian Chen Yin Deng Zhiming Yan Isothermal Oxidation Kinetics of Iron Powders Under Vapor Atmosphere Metals iron powder isothermal oxidation kinetics vapor atmosphere |
| title | Isothermal Oxidation Kinetics of Iron Powders Under Vapor Atmosphere |
| title_full | Isothermal Oxidation Kinetics of Iron Powders Under Vapor Atmosphere |
| title_fullStr | Isothermal Oxidation Kinetics of Iron Powders Under Vapor Atmosphere |
| title_full_unstemmed | Isothermal Oxidation Kinetics of Iron Powders Under Vapor Atmosphere |
| title_short | Isothermal Oxidation Kinetics of Iron Powders Under Vapor Atmosphere |
| title_sort | isothermal oxidation kinetics of iron powders under vapor atmosphere |
| topic | iron powder isothermal oxidation kinetics vapor atmosphere |
| url | https://www.mdpi.com/2075-4701/15/5/553 |
| work_keys_str_mv | AT wenchaohe isothermaloxidationkineticsofironpowdersundervaporatmosphere AT jianchen isothermaloxidationkineticsofironpowdersundervaporatmosphere AT yindeng isothermaloxidationkineticsofironpowdersundervaporatmosphere AT zhimingyan isothermaloxidationkineticsofironpowdersundervaporatmosphere |