Original Article:
Deoxidation of Titanium Using Mg as Deoxidant in MgCl2-YCl3 Flux
Chenyi Zheng, et al.
Metallurgical and Materials Transactions B, 2019, 50: 622-631.
10.1007/s11663-018-1494-2
Titanium (Ti) and its alloys are known for their high specific strength and corrosion resistance. However, due to the strong affinity of Ti for both Fe and O, it is challenging to develop a new titanium smelting process to avoid impurities such as O and Fe. In this study, the authors developed a refining process to remove O impurities from Ti. The research results show that this new deoxidation flux using rare earth-containing magnesium chloride can be applied to the recycling of titanium scrap in the future.
New deoxidation process for Ti
The new concept of deoxidation of Ti by using (a) formation of rare earth oxyhalides and (b) formation of Mg and rare earth oxyhalides is shown in the figure.
1. The process uses Mg in a mixture of magnesium chloride (MgCl2) and yttrium chloride (YCl3) at 1300 K (1027 °C) as a deoxidizer.
2. The activity of MgO (aMgO) in the system is effectively reduced and kept low due to the formation of yttrium oxide (YOCl).
3. The results of thermodynamic evaluation showed that the deoxidation of Ti to an oxygen level below 1000 mass ppm O, via the reaction O (in Ti) + Mg + YCl3 → MgCl2 + YOCl.
4. The study also discusses the possibility of electrochemical deoxidation. In the MgCl2-YCl3 flux, Mg is deposited on the Ti cathode and deoxidizes it simultaneously.
Chemicals Related in the Paper:
| Catalog Number | Product Name | Structure | CAS Number | Price |
|---|---|---|---|---|
| ACM14989298 | Magnesium chloride |  |
14989-29-8 | Price |
