Properties of Dispersion-Hardened Copper Made by Internal Oxidation of Prealloyed Copper Powder Containing 2.5 wt. % Al

Rajković, Višeslava; Božić, D.; Vračarić, D.; Romhanji, Endre

doi:10.4028/www.scientific.net/msf.494.493

Cited by 3 publications

(2 citation statements)

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“…Ιn all three cases, BM1, BM2 and BM3, the size of the crystallites of the crystal structures is within the range of 12.0-22.0 nm. The size of the crystallites is verified by previous studies indicating that with this synthesis technique, the crystal structures are in the nano-dimensions [20,21]. In Fig.…”

Section: Pos(bpu11)210supporting

confidence: 81%

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Formation of Copper Selenide synthesized by Mechanical Alloying

Stathokostopoulos,

Pavlidis,

Karagiannis

et al. 2023

Proceedings of 11th International Conference of the Balkan Physical Union — PoS(BPU11)

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Copper selenides are attractive materials for high-temperature thermoelectric applications. They exhibit remarkably enhanced thermoelectric properties originating from their superionic liquid character. In this work, the synthesis of Cu-Se compounds is investigated using mechanical alloying, aiming to obtain the Cu 2 Se phase and modify the crystal structure by annealing at high temperatures and quenching. In the first part, Cu-Se powders are prepared at various milling times. They are characterized regarding their structure, morphology and composition by X-ray diffraction analysis and scanning electron microscopy. After 2.5 h of synthesis, α-Cu 2 Se and β-Cu 2 Se was attained in the powder, with the former having the highest percentage contribution. The crystallite size of these phases was calculated to be in the range of 17.0-19.6 nm. The synthesized powder consisted of grains with dimensions from nanometers to micrometers and their aggregates. A trace of a possibly surficial layer of copper oxide was also detected on the sample. In the second part of this study, the optimum synthesized powder was subjected to 2 h of annealing at 650 °C, followed by quenching. According to X-ray diffraction analysis, the percentage contribution of the thermoelectrically inferior α-Cu 2 Se phase increased being the vast majority of the material and almost eliminated β-Cu 2 Se. The crystallite size was calculated to be in the range of 31.2-34.5 nm. Overall, the desired Cu 2 Se compound can be obtained by the mechanical alloying technique as α-and β-phase, and the crystal structure can be modified by annealing under appropriate conditions.

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Section: Pos(bpu11)210supporting

confidence: 81%

“…3(a), the crystallite sizes of the different crystal structures are demonstrated. It is widely known that, as the milling time increases, the crystallite size of each phase decreases [20]. However, in this work, no identical phases are found between the samples so such a…”

Section: Analysis Of Crystallographic Constants and Characteristics O...mentioning

confidence: 57%