Autor: Kim, B. S. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Effect of Ga2O3 Nanoparticles Dispersion on Microstructure and Thermoelectric Properties of p-Type BiSbTe Based Alloys
Autorzy:: Kim, E.-B.
Koo, J.-M.
Hong, S.-J.
Powiązania:: https://bibliotekanauki.pl/articles/351366.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: thermoelectric properties
Bi0.5Sb1.5Te3 alloys
Seebeck coefficient
mechanical alloying
spark plasma sintering
Opis:: In this study, p-type Bi_0.5Sb_1.5Te₃ based nanocomposites with addition of different weight percentages of Ga₂O₃ nanoparticles are fabricated by mechanical milling and spark plasma sintering. The fracture surfaces of all Bi_0.5Sb_1.5Te₃ nanocomposites exhibited similar grain distribution on the entire fracture surface. The Vickers hardness is improved for the Bi_0.5Sb_1.5Te₃ nanocomposites with 6 wt% added Ga₂O₃ due to exhibiting fine microstructure, and dispersion strengthening mechanism. The Seebeck coefficient of Bi_0.5Sb_1.5Te₃ nanocomposites are significantly improved owing to the decrease in carrier concentration. The electrical conductivity is decreased rapidly upon the addition of Ga₂O₃ nanoparticle due to increasing carrier scattering at newly formed interfaces. The peak power factor of 3.24 W/mK² is achieved for the base Bi_0.5Sb_1.5Te₃ sintered bulk. TheBi_0.5Sb_1.5Te₃ nanocomposites show low power factor than base sample due to low electrical conductivity.
Źródło:: Archives of Metallurgy and Materials; 2017, 62, 2B; 993-997
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Understanding the Oxide Dispersion Behavior of Yttria in Metal Matrix of MA956 Alloy through High-Energy Milling and Hot Press Sintering
Autorzy:: Swain, B.
Han, D.
Kim, G.-H.
Kong, M.-S.
Ahn, B.
Powiązania:: https://bibliotekanauki.pl/articles/351770.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: ODS
mechanical alloying
high-energy milling
oxide particle distribution
Opis:: MA956 (Fe-Cr-Al) alloy powder was high-energy ball milled with various amount of yttria contents (1,2,3, and 4 wt.%) to fabricate an oxide dispersion strengthened alloy. The milled powders were then consolidated using hot press sintering at 1150°C. The surface morphology and crystal structure of MA956 powder during the high-energy milling depending on the yttria contents was investigated using particle size analysis, X-ray diffraction, and scanning electron microscopy. The microstructural analysis of sintered alloy was performed using transmission electron microscopy and energy dispersive spectroscopy to evaluate the dispersion behavior of yttrium oxide. The results showed that, as yttria contents increased, the oxide particles became finer and are uniformly distributed during the high-energy milling. However, after the sintering, the oxide particles were coarsened with more than 3 wt.% of yttria addition.
Źródło:: Archives of Metallurgy and Materials; 2017, 62, 2B; 1377-1381
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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