“…It is well known that the non-equilibrium plasma spraying process is characterized by high temperatures (∼10,000 K), high velocity (about 200 m s −1 ) and extremely high cooling rate (about 10 6 -10 8 K s −1 ) [6,14,22]. Therefore, the reaction products (FeAl 2 O 4 , Al 2 O 3 and Fe), which were also reported in other non-equilibrium processing of Al-Fe 2 O 3 thermite system [25][26][27][28], were different from that of the equilibrium reaction condition (Al 2 O 3 and Fe).…”