In situ synthesis of FeSi–Al2O3 nanocomposite powder by mechanical alloying

Zakeri, M.; Rahimipour, Mohammad Reza; Sadrnezhad, S K

doi:10.1016/j.jallcom.2009.12.020

Cited by 13 publications

(8 citation statements)

References 12 publications

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“…It is revealed that by increasing the milling time up to 720 min, no further reaction took place in the system and only the XRD peaks of FeNi became broader and less intense due to the accumulated internal strain and refinement of crystalline size. Considering that due to amorphous structure or very 110 Materials Science and Engineering Application II small crystallite size of Al2O3 and also very large difference between the mass absorption coefficients of FeNi and Al2O3 phases [14], the XRD peaks of Al2O3 couldn't be clearly seen on XRD patterns [22][23]. To study the thermal behavior of nanocomposite powders, the 720 min milled FeNi-30wt.% Al2O3 sample was annealed at the temperature of 800ºC for 30 min.…”

Section: Resultsmentioning

confidence: 99%

“…FeNi-Al2O3 nanocomposites can be fabricated by mechanical alloying through direct mixing of Fe, Ni and Al2O3 [11] or FeNi and Al2O3 powders. But the resulting heterogeneous microstructure and high cost of the starting materials are two important limitations of these methods [14]. Qin et all have been reported a method using mechanochemical process plus hot-pressing of Fe(NO3)3.H2O, Ni(NO3)2.H2O and Al2O3 powder mixture for fabrication of γ-Ni-xFe/Al2O3 ultra-fine grained composites [2][3].…”

Section: Introductionmentioning

confidence: 99%

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Mechanochemical Synthesis and Characterization of FeNi-Al2O3 Nanocomposites

Sajjadi

Beygi

Zare

2011

AMR

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In this Study, FeNi-Al2O3 nanocomposites with three different compositions were successfully synthesized through mechanical alloying of Fe2O3, Ni and Al powders mixture. Characterization of the products was accomplished by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD). The effect of various parameters such as chemical composition of starting materials, milling time and annealing on the phase evolution, morphology and microhardness of samples was investigated. It was found that FeNi matrix nanocomposites reinforced with 10, 15 and 30wt.% of Al2O3 were fabricated in 300, 240 and 180 min of milling, respectively. The crystallite size of the intermetallic FeNi phase and particle size of Al2O3 in the 720 min milled FeNi-30wt.%Al2O3 nanocomposite sample were calculated 28nm and 5.15 µm, respectively. Microhardness results also showed the same sample had the maximum hardness value of 790 HV.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanochemical Synthesis and Characterization of FeNi-Al2O3 Nanocomposites

Sajjadi

Beygi

Zare

2011

AMR

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“…It has been confirmed that the addition of Al 2 O 3 improves the mechanical properties of many metal silicides [23][24][25]. Furthermore, the highly exothermic nature of the thermite reaction is a great benefit to the SHS process.…”

Section: Introductionmentioning

confidence: 91%

Thermite reduction of Ta2O5/SiO2 powder mixtures for combustion synthesis of Ta-based silicides

Yeh

Huang

2011

Journal of Alloys and Compounds

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“…It was found that decomposition of KNO 3 generated enough thermal energy to assist the combustion reaction in a stable and self-sustaining mode, and that the resulting product consisted of FeSi and α-FeS i2 [22]. Moreover, the FeSi-Al 2 O 3 composite was synthesized by the mechanical alloying of SiO 2 , Al, and Fe powders, and complete reduction of SiO 2 by Al was reached after 45 h of milling [23].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of FeSi-Al2O3 Composites by Autowave Combustion with Metallothermic Reduction

Yeh

Chen

2021

Metals

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Fabrication of FeSi-Al2O3 composites with a molar ratio of FeSi/Al2O3 ranging from 1.2 to 4.5 was conducted by the self-propagating high-temperature synthesis (SHS) method. The synthesis reaction involved metallothermic reduction of Fe2O3 and SiO2 by Al and the chemical interaction of Fe and Si. Two combustion systems were examined: one contained thermite reagents of 0.6Fe2O3 + 0.6SiO2 + 2Al, and the other had Fe2O3 + 2Al to mix with different amounts of Fe and Si powders. A thermodynamic analysis indicated that metallothermic reduction of oxide precursors was sufficiently exothermic to sustain the combustion reaction in a self-propagating mode. The SHS reaction carrying out co-reduction of Fe2O3 and SiO2 was less exothermic, and was applied to synthesize products with FeSi/Al2O3 = 1.2–2.5, while the reaction reducing only Fe2O3 was more energetic and was adopted for the composites with FeSi/Al2O3 = 2.5–4.5. Moreover, the former had a larger activation energy, i.e., Ea = 215.3 kJ/mol, than the latter, i.e., Ea = 180.4 kJ/mol. For both reaction systems, the combustion wave velocity and temperature decreased with increasing FeSi content. Formation of FeSi-Al2O3 in situ composites with different amounts of FeSi was achieved. Additionally, a trivial amount of aluminum silicate was detected in the products of high FeSi contents due to dissolution of Si into Al2O3 during the SHS process.

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In situ synthesis of FeSi–Al2O3 nanocomposite powder by mechanical alloying

Cited by 13 publications

References 12 publications

Mechanochemical Synthesis and Characterization of FeNi-Al2O3 Nanocomposites

Mechanochemical Synthesis and Characterization of FeNi-Al2O3 Nanocomposites

Thermite reduction of Ta2O5/SiO2 powder mixtures for combustion synthesis of Ta-based silicides

Synthesis of FeSi-Al2O3 Composites by Autowave Combustion with Metallothermic Reduction

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