Morphology modulation of SiC nano-additives for mechanical robust high thermoelectric performance Mg₂Si_{1 − x}Sn_x/SiC nano-composites

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• 作者：Kang Yin^a ; Xianli Su^a ; ^{suxianli@whut.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Yonggao Yan^a ; Hao Tang^a ; Mercouri G. Kanatzidis^b ; Ctirad Uher^c ; Xinfeng Tang^a ; ^{tangxf@whut.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Mg2Si1  ; &minus ;   ; xSnx ; Nano-composite ; Thermoelectric properties ; Mechanical properties
• 刊名：Scripta Materialia
• 出版年：2017
• 出版时间：1 January 2017
• 年：2017
• 卷：126
• 期：Complete
• 页码：1-5
• 全文大小：1287 K

文摘

SiC nano-powders and nano-wires with excellent toughness as well as high strength were incorporated in Mg_2.16(Si_0.3Sn_0.7)_0.98Sb_0.02. The effect of the morphology and phase fraction of nano-SiC additives on the thermoelectric (TE) as well as mechanical properties of the composite was characterized in detail. It is found that, due to the pinning effect, fiber bridging and fiber pull-out mechanisms, the fracture toughness and the compressive strength of the composite with 0.8 at.% SiC nano-powders or nano-wires are improved by about 50% and 30%, respectively. And the TE properties changed little, with a maximum ZT value of ~ 1.20 at 750 K.