Magnesiothermic reduction for direct synthesis of Ti-Nb alloy at 1073 K (800 °C)

• Published in: Metals and materials international Vol. 23; no. 5; pp. 1037 - 1044
• Main Authors: Choi, Kyunsuk, Lee, Kwang Hee, Ali, Basit, Choi, Sang-Hoon, Park, Kyoung-Tae, Sohn, Il
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Institute of Metals and Materials 01.09.2017; Springer Nature B.V; 대한금속·재료학회
• Subjects: Alloying elements; Characterization and Evaluation of Materials; Chemical potential; Chemistry and Materials Science; Coordination compounds; Electron microscopes; Engineering Thermodynamics; Heat and Mass Transfer; Machines; Magnetic Materials; Magnetism; Manufacturing; Materials Science; Metal oxides; Metallic Materials; Mixed oxides; Niobium; Processes; Raw materials; Solid Mechanics; Titanium base alloys; Titanium oxides; 재료공학; powder metallurgy; Ti-Nb alloys; Nb; Ti; magnesiothermic reduction
• ISSN: 1598-9623; 2005-4149
• DOI: 10.1007/s12540-017-7010-4

Direct fabrication of titanium (Ti) and niobium (Nb) alloys by direct magnesiothermic reduction from the respective initial metal oxides and complex oxides has been studied. TiO 2 , Nb 2 O 5 , and complex TiNb 2 O 7 oxides were used as raw materials with Mg used as a reductant. To ensure a high chemical potential of the reactants to drive the spontaneous magnesiothermic reduction of the oxide mixtures, excess Mg five times higher than the required stoichiometric molar ratio was added. Samples were heated in a glove box under recycled and purified Ar atmosphere at 1073 K (800 °C) for 10 h. After the reduction of TiO 2 , intermediate oxide phases of Ti 6 O could still be observed, but reduction of Nb 2 O 5 and TiNb 2 O 7 showed metallic Nb and Ti-Nb to be present with negligible oxides according to the scanning electron microscope-energy dispersive spectroscopy and x ray diffraction analysis. This indicated that direct fabrication of Ti-Nb alloys through a complex TiNb 2 O 7 oxide is possible and can be more efficient than alloying pure metallic elements of Ti and Nb.