Intermetallic/Ceramic Composites Synthesized from Al–Ni–Ti Combustion with B4C Addition

Yeh, C.L.; Ke, Chih-Yao

doi:10.3390/met10070873

Cited by 6 publications

(6 citation statements)

References 36 publications

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“…Measurement of Vickers hardness and fracture toughness of the products was performed [27]. For such measurements, only selected experiments under stoichiometric coefficients of x = y = z = 2 were carried out by placing the sample compact in a stainlesssteel mold.…”

Section: Methodsmentioning

confidence: 99%

Metallothermic Reduction of MoO3 on Combustion Synthesis of Molybdenum Silicides/MgAl2O4 Composites

Yeh

Chen

2021

Materials

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Combustion synthesis involving metallothermic reduction of MoO3 by dual reductants, Mg and Al, to enhance the reaction exothermicity was applied for the in situ production of Mo3Si–, Mo5Si3− and MoSi2–MgAl2O4 composites with a broad compositional range. Reduction of MoO3 by Mg and Al is highly exothermic and produces MgO and Al2O3 as precursors of MgAl2O4. Molybdenum silicides are synthesized from the reactions of Si with both reduced and elemental Mo. Experimental evidence indicated that the reaction proceeded as self-propagating high-temperature synthesis (SHS) and the increase in silicide content weakened the exothermicity of the overall reaction, and therefore, lowered combustion front temperature and velocity. The XRD analysis indicated that Mo3Si–, Mo5Si3– and MoSi2–MgAl2O4 composites were well produced with only trivial amounts of secondary silicides. Based on SEM and EDS examinations, the morphology of synthesized composites exhibited dense and connecting MgAl2O4 crystals and micro-sized silicide particles, which were distributed over or embedded in the large MgAl2O4 crystals.

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Section: Methodsmentioning

confidence: 99%

Metallothermic Reduction of MoO3 on Combustion Synthesis of Molybdenum Silicides/MgAl2O4 Composites

Yeh

Chen

2021

Materials

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“…Calculation of T ad was performed for Reactions (1) and 2under different x and y, based on the following energy balance equation [25,26] with thermochemical data taken from [18,27].…”

Section: 6fementioning

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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“…Microstructure of Al/B4C materials and of Al-B4C interfacial zones are important issue for mechanical properties and so commonly characterized in literature [21][22]. For example, the fabrication of such composite materials, using liquid route process, leads to interfacial reaction between Al and B4C [23].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Al/B4C composite materials fabricated by powder metallurgy process technique for nuclear applications

BRILLON

Garcia

RIALLANT

et al. 2022

Journal of Nuclear Materials

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Intermetallic/Ceramic Composites Synthesized from Al–Ni–Ti Combustion with B4C Addition

Cited by 6 publications

References 36 publications

Metallothermic Reduction of MoO3 on Combustion Synthesis of Molybdenum Silicides/MgAl2O4 Composites

Metallothermic Reduction of MoO3 on Combustion Synthesis of Molybdenum Silicides/MgAl2O4 Composites

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

Characterization of Al/B4C composite materials fabricated by powder metallurgy process technique for nuclear applications

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