中國有色金屬學報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 32 No. 7 July 2022 |
（1. State Key Laboratory of Advanced Special Steel & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China;
2. School of Metallurgy and Materials Engineering, Jiangsu University of Science and Technology, Zhangjiagang 215600, China;
3. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral, Ministry of Education, Northeastern University, Shenyang 110819, China;
4. Shanghai Special Casting Engineering Technology Research Center, Shanghai 201605, China;
5. School of Materials Science and Engineering, Shanghai Dianji University, Shanghai 201306, China）
Abstract:Titanium aluminum (TiAl) scraps with a high oxygen content were treated with yttrium (Y) in a liquid chemical deoxidization process for recycling. The Gibbs free energy and the equilibrium constant of the deoxidization reaction were calculated, and the effects of the yttrium content and the system pressure on the oxygen content in the product were determined. The results showed that the oxygen in TiAl scraps could be removed by yttrium, and the oxygen content of the deoxidized TiAl scraps had only 10% of the original content after deoxidization. Furthermore, the oxygen content of the deoxidized TiAl scraps was decreased with the increase of yttrium addition. The higher the chamber pressure, the greater the oxygen content in the final TiAl alloys. These results were consistent with calculated values. The microstructure of the deoxidized alloys was akin to that of the original material; however, Y2O3 particles were observed in the deoxidized alloys.
Key words: titanium aluminum scrap; yttrium; deoxidation; recycling
