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چکیده
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In this research, the ferrosilicomanganese powder was synthesized via mechanical alloying and SHS methods. Silicon oxide, manganese oxide, iron and aluminum powders were used as starting materials. SHS process was initiated by oxyacetylene flame. The activated and inactivated powder mixtures were used for producing ferrosilicomanganese grade 26%Si-53%Mn-21%Fe. The powder mixtures were characterized by X-ray diffractometry, scanning electron microscopy and energy dispersive X-ray spectroscopy. Thermodynamic analysis showed that aluminothermic reduction of MnO2 is more thermodynamically favored as compared with aluminothermic reduction of SiO2. Adiabatic temperature of MnO2 and SiO2 reduction by Al was calculated about 2946 K. It was found that no reaction took place during mechanical alloying. After annealing and SHS processes, first MnO2, then SiO2 oxides were reduced by Al and ferrosilicomanganese and Al2O3 phases were produced. Due to the high adiabatic temperature, all products were formed in liquid state, leading to produce sintered ferrosilicomanganese and isolated Al2O3 particles. 2020 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder
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