Reduction reactions applied for synthesizing different nano-structured materials

Brocchi, E. A.; Siqueira, Rogério Navarro Correia de; Motta, Marcelo; Moura, F.; Solórzano-Naranjo, Ivan Guillermo

doi:10.1016/j.matchemphys.2013.03.034

Cited by 14 publications

(3 citation statements)

References 13 publications

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“…The peaks of Ni, Fe, C, Sn, and Pb are weak and are not apparent, whereas the diffraction peaks of Al 2 O 3 whiskers and particles, ZrO 2 particles, and La are not detected. This is attributed to their low content, and similar results have been reported in other studies [14,22]. Meanwhile, no CuO or oxide of other alloying elements was detected in the XRD pattern, indicating that no oxidation occurred during the milling process.…”

Section: Resultssupporting

confidence: 89%

“…Various powder metallurgy routes are available for the fabrication of the copper matrix composites reinforced with Al 2 O 3 particles, including mechanical milling of Cu with alumina [14,15,16], internal oxidation of Cu-Al alloy powders followed by reduction [17,18,19], as well as the use of an in situ thermo-chemical technique [20,21,22,23]. In addition, some extensive methods such as equal channel extrusion and the rolling method can also be used for the fabrication of these composites [24,25].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the Microstructure and Mechanical Properties of Copper-Graphite Composites Reinforced with Single-Crystal α-Al2O3 Fibres by Hot Isostatic Pressing

Zhang

Jiang

Qiao³

et al. 2018

Materials

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Single-crystal α-Al2O3 fibres can be utilized as a novel reinforcement in high-temperature composites owing to their high elastic modulus, chemical and thermal stability. Unlike non-oxide fibres and polycrystalline alumina fibres, high-temperature oxidation and polycrystalline particles boundary growth will not occur for single-crystal α-Al2O3 fibres. In this work, single-crystal α-Al2O3 whiskers and Al2O3 particles synergistic reinforced copper-graphite composites were fabricated by mechanical alloying and hot isostatic pressing techniques. The phase compositions, microstructures, and fracture morphologies of the composites were investigated using X-ray diffraction, a scanning electron microscope equipped with an X-ray energy-dispersive spectrometer (EDS), an electron probe microscopic analysis equipped with wavelength-dispersive spectrometer, and a transmission electron microscope equipped with EDS. The mechanical properties have been measured by a micro-hardness tester and electronic universal testing machine. The results show that the reinforcements were unevenly distributed in the matrix with the increase of their content and there were some micro-cracks located at the interface between the reinforcement and the matrix. With the increase of the Al2O3 whisker content, the compressive strength of the composites first increased and then decreased, while the hardness decreased. The fracture and strengthening mechanisms of the composite materials were explored on the basis of the structure and composition of the composites through the formation and function of the interface. The main strengthening mechanism in the composites was fine grain strengthening and solid solution strengthening. The fracture type of the composites was brittle fracture.

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Investigation of the Microstructure and Mechanical Properties of Copper-Graphite Composites Reinforced with Single-Crystal α-Al2O3 Fibres by Hot Isostatic Pressing

Zhang

Jiang

Qiao³

et al. 2018

Materials

View full text Add to dashboard Cite

show abstract

“…With such a concentration of oxygen vacancies the alumina crystal retains its mechanical properties, chemical stability, but the luminescence yield increases greatly. The described technique of making dosimetric phosphors on the base of oxygen-deficient oxides is a kind of method of carbothermal reduction of oxide compounds, which is widely used at present to synthesize various functional materials [7,8].…”

Section: Introductionmentioning

confidence: 99%