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题名: Fracture mode, microstructure and temperature-dependent elastic moduli for thermoelectric composites of PbTe–PbS with SiC nanoparticle additions
作者: Jennifer E Ni
Eldon D Case
Robert D Schmidt
Chun-I Wu
Rosa M Trejo
Timothy P Hogan
Edgar Lara-Curzio
Mercouri G Kanatzidis
贡献者: 國立臺灣海洋大學:機械與機電工程學系
关键词: elastic properties
日期: 2013-09
上传时间: 2018-09-28T06:38:45Z
出版者: Philosophical Magazine
摘要: Abstract: Twenty-six (Pb0.95Sn0.05Te)0.92(PbS)0.08–0.055% PbI2–SiC nanoparticle (SiCnp) composite thermoelectric specimens were either hot pressed or pulsed electric current sintered (PECS). Bloating (a thermally induced increase in porosity, P, for as-densified specimens) was observed during annealing at temperatures >603 K for hot-pressed specimens and PECS-processed specimens from wet milled powders, but in contrast seven out of seven specimens densified by PECS from dry milled powders showed no observable bloating following annealing at temperatures up to 936 K. In this study, bloating in the specimens was accessed via thermal annealing induced changes in (i) porosity measured by scanning electron microscopy on fractured specimen surfaces, (ii) specimen volume and (iii) elastic moduli. The moduli were measured by resonant ultrasound spectroscopy. SiCnp additions (1–3.5 vol.%) changed the fracture mode from intergranular to transgranular, inhibited grain growth, and limited bloating in the wet milled PECS specimens. Inhibition of bloating likely occurs due to cleaning of contamination from powder particle surfaces via PECS processing which has been reported previously in the literature.
關聯: 93(35) pp.4412-4439
显示于类别:[機械與機電工程學系] 期刊論文


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