Deoxidation of Titanium Using Ytterbium-Halide-Flux Method
Efficient removal of oxygen (O) impurities from titanium (Ti) scrap is necessary to accelerate the recycling of Ti scrap. However, deoxidation of Ti is extremely difficult, both thermodynamically and technically. In this study, we developed a deoxidation technique that uses Yb (a rare earth metal wi...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
The Mining and Materials Processing Institute of Japan
2024-11-01
|
| Series: | Journal of MMIJ |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/journalofmmij/140/11/140_2024-007/_pdf/-char/en |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850263479691247616 |
|---|---|
| author | Takanari OUCHI Kenta AKAISHI Gen KAMIMURA Toru H. OKABE |
| author_facet | Takanari OUCHI Kenta AKAISHI Gen KAMIMURA Toru H. OKABE |
| author_sort | Takanari OUCHI |
| collection | DOAJ |
| description | Efficient removal of oxygen (O) impurities from titanium (Ti) scrap is necessary to accelerate the recycling of Ti scrap. However, deoxidation of Ti is extremely difficult, both thermodynamically and technically. In this study, we developed a deoxidation technique that uses Yb (a rare earth metal with high vapor pressure at elevated temperatures) to directly remove O dissolved in solid Ti. Experimental results showed that deoxidation using Yb in halide salt fluxes such as LiCl and LiF produced Ti with O concentrations of 520-1400 mass ppm. The O concentration in deoxidized Ti samples was reduced to a level lower than that in Ti under the Yb/Yb2O3 equilibrium, probably owing to the decrease in the activity of Yb2O3, which was the deoxidation product, caused by its dissolution in the fluxes. In contrast, when vapor of Yb metal and halide salts were supplied to Ti samples via a gas phase, the Ti samples were deoxidized to the same O concentration as that under the Yb/Yb2O3 equilibrium. This deoxidation limit was controlled by the Yb/Yb2O3 equilibrium. The supply of halide salt vapor did not affect the deoxidation limit. The proposed deoxidation method is expected to help scale up the recycling of Ti scrap and ensure efficient utilization of resources. |
| format | Article |
| id | doaj-art-f15bbec0c1904bc1992a4e11a99263f3 |
| institution | OA Journals |
| issn | 1881-6118 1884-0450 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | The Mining and Materials Processing Institute of Japan |
| record_format | Article |
| series | Journal of MMIJ |
| spelling | doaj-art-f15bbec0c1904bc1992a4e11a99263f32025-08-20T01:54:57ZengThe Mining and Materials Processing Institute of JapanJournal of MMIJ1881-61181884-04502024-11-011401115716910.2473/journalofmmij.MMIJ-2024-007journalofmmijDeoxidation of Titanium Using Ytterbium-Halide-Flux MethodTakanari OUCHI0Kenta AKAISHI1Gen KAMIMURA2Toru H. OKABE3Institute of Industrial Science, The University of TokyoInstitute of Industrial Science, The University of Tokyo / Department of Materials Engineering, Graduate School of Engineering, The University of TokyoInstitute of Industrial Science, The University of TokyoInstitute of Industrial Science, The University of TokyoEfficient removal of oxygen (O) impurities from titanium (Ti) scrap is necessary to accelerate the recycling of Ti scrap. However, deoxidation of Ti is extremely difficult, both thermodynamically and technically. In this study, we developed a deoxidation technique that uses Yb (a rare earth metal with high vapor pressure at elevated temperatures) to directly remove O dissolved in solid Ti. Experimental results showed that deoxidation using Yb in halide salt fluxes such as LiCl and LiF produced Ti with O concentrations of 520-1400 mass ppm. The O concentration in deoxidized Ti samples was reduced to a level lower than that in Ti under the Yb/Yb2O3 equilibrium, probably owing to the decrease in the activity of Yb2O3, which was the deoxidation product, caused by its dissolution in the fluxes. In contrast, when vapor of Yb metal and halide salts were supplied to Ti samples via a gas phase, the Ti samples were deoxidized to the same O concentration as that under the Yb/Yb2O3 equilibrium. This deoxidation limit was controlled by the Yb/Yb2O3 equilibrium. The supply of halide salt vapor did not affect the deoxidation limit. The proposed deoxidation method is expected to help scale up the recycling of Ti scrap and ensure efficient utilization of resources.https://www.jstage.jst.go.jp/article/journalofmmij/140/11/140_2024-007/_pdf/-char/endeoxidationtitanium scraprecyclingytterbium |
| spellingShingle | Takanari OUCHI Kenta AKAISHI Gen KAMIMURA Toru H. OKABE Deoxidation of Titanium Using Ytterbium-Halide-Flux Method Journal of MMIJ deoxidation titanium scrap recycling ytterbium |
| title | Deoxidation of Titanium Using Ytterbium-Halide-Flux Method |
| title_full | Deoxidation of Titanium Using Ytterbium-Halide-Flux Method |
| title_fullStr | Deoxidation of Titanium Using Ytterbium-Halide-Flux Method |
| title_full_unstemmed | Deoxidation of Titanium Using Ytterbium-Halide-Flux Method |
| title_short | Deoxidation of Titanium Using Ytterbium-Halide-Flux Method |
| title_sort | deoxidation of titanium using ytterbium halide flux method |
| topic | deoxidation titanium scrap recycling ytterbium |
| url | https://www.jstage.jst.go.jp/article/journalofmmij/140/11/140_2024-007/_pdf/-char/en |
| work_keys_str_mv | AT takanariouchi deoxidationoftitaniumusingytterbiumhalidefluxmethod AT kentaakaishi deoxidationoftitaniumusingytterbiumhalidefluxmethod AT genkamimura deoxidationoftitaniumusingytterbiumhalidefluxmethod AT toruhokabe deoxidationoftitaniumusingytterbiumhalidefluxmethod |