Using aluminothermic reduction of nickel oxide in formation of AlNi intermetallic compound

Abstract

The reduction of nickel oxide and the formation of AlNi intermetalic phase at 1200°C for 2.5 till 10 min interval, during the aluminothermic method were studied, simultaneously. Aluminium was used as a reduction agent of nickel oxide in molten cryolite (Na 3 AlF 6 ). The changes in the amount of Ni in primitive metal samples were determined by atomic absorption analysis at different times. The achieved microstructure in quenched samples was observed by SEM. The prepared phases were recognised by XRD and EDS analysis. The results revealed that samples were combination of AlNi, Al 3 Ni 2 , Al 3 Ni and Al in the absence of Ni, NiO and Al 2 O 3 phases. The increasing of time causes the higher amount of AlNi phase to a continuous network.

Elaboration of the Al-Al3Ni Alloy Eutectic by a Carbothermal Process

“…A large variety of methods were reported for the aluminum alloys Al-Al 3 Ni involving casting [6,[12][13][14][15][16][17][18][19][20][21][22][23][24][25], solidi cation [26][27][28][29], arc melting [28], combustion method [27], aluminothermic reduction [30], mechanical alloying [31], and high-pressure torsion (HPT) [32]. Each of these methods has its advantages depending on the eld of application.…”

“…However, many techniques are relatively complicated or expensive [ 26 ]. Some of these methods pose some problems, for example, the pyrometallurgical aluminothermic processes take place at high temperatures [ 30 ], the mechanical alloying requires a long processing time, the combustion method produces porous materials, and during melting, the casting process causes segregation and alloy evaporation [ 33 ].…”