Fabrication of Ti-Al intermetallics by a two-stage aluminothermic reduction process using Na2TiF6

作者：Zhao, Kun; Feng, Naixiang^*; Wang, Yaowu

来源：Intermetallics, 2017, 85: 156-162.

DOI：10.1016/j.intermet.2017.02.016

• Vacuum
• Aluminothermic reduction
• Ti-Al intermetallics
• Cryolite

A novel two-stage method, based on aluminothermic reduction of Na2TiF6, has been proposed to prepare Ti-Al intermetallic alloys in this paper. The entire process of the two-stage aluminothermic reduction was introduced in detail. The result of thermal analysis demonstrated that the aluminothermic reduction reaction was an exothermic process and occurred at approximately 660 degrees C. Besides Ti-containing cryolite, pure Ti3Al, TiAl and TiAl3 intermetallics could be prepared after the first stage reduction. Further, in secondary reduction, Ti-containing cryolite contained Ti4+, TiOS and Ti-Al intermetallics could be purified completely. As a result, pure cryolite and Al-Ti alloy were obtained. A concept of continuous and cyclic route was proposed. The two-stage aluminothermic reduction process provided a high productivity and pollution-free metallurgical way for preparing Ti-Al intermetallic alloys.

• 出版日期2017-6
• 单位东北大学