中國有色金屬學報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 26 No. 11 November 2016 |
（1. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China;
2. Energy, Plasma, and Electrochemistry Research Center (CREPE), Chemical and Biotechnical Engineering Department, Université de Sherbrooke, Sherbrooke J1K 2R1, QC, Canada）
Abstract:In order to prepare high quality Mo(Si,Al)2 feedstock characterized with C40 phase, higher Al doping amount and excellent flowability, Mo(Si1-x,Alx)2 with different Al contents (x=0, 0.1, 0.2, 0.3, 0.4, 0.5) were synthesized by self-propagating high-temperature synthesis first and Mo(Si0.6,Al0.4)2 was confirmed as the suitable material through X-ray diffraction analysis. A series of tests with different parameters of induction plasma spheroidization were applied to improving the flowability of feedstock. Mo(Si,Al)2 feedstock with excellent flowability (26.2 s/50 g) was prepared through adding hydrogen into sheath gas and decreasing the powder feeding rate. The composition segregation occurred in the spheroidized powder after Al consumption and oxidation. The inhomogeneous structure of the same particle was caused by the asymmetric heating and cooling when particle passed through the plasma jet.
Key words: Mo(Si, Al)2; C40 phase; self-propagating high-temperature synthesis; induction plasma spheroidization; composition segregation
