Effect of thermal annealing on the microstructure and thermoelectric properties of nano-TiN/Co4Sb11.5Te0.5 composites
Effect of thermal annealing on the microstructure and thermoelectric properties of nano-TiN/Co4Sb11.5Te0.5 composites
复制标题
DOI：
10.1007/s10854-013-1538-y
复制
发表时间：
2013-10
期刊：
影响因子：
--
通讯作者：
Pengfei Wen;Bo Duan;P. Zhai;Peng Li;Qingjie Zhang
中科院分区：
文献类型：
--
作者：
Pengfei Wen;Bo Duan;P. Zhai;Peng Li;Qingjie Zhang
在773 K真空条件下，系统研究了不同热处理时间的纳米tin （1 vol%）分散Co4Sb11.5Te0.5角晶石复合材料的微观结构和热电性能。退火后试样内部气孔和表面凸起明显形成。退火120 h后，样品的孔隙率提高了10%。热处理后的元素组成和相组成保持稳定。退火后试样的孔隙率增大，电导率和导热系数同时下降，但导热系数下降更为明显。此外，退火后的塞贝克系数变化不大。结果表明，经过120 h退火后，ZT值提高了20%。结果表明：退火处理可以在一定程度上提高TiN/Co4Sb11.5Te0.5纳米复合材料的ZT值，但也会使样品的组织劣化，导致样品的力学繁荣度下降；
The microstructure and thermoelectric properties of nano-TiN (1 vol%) dispersed Co4Sb11.5Te0.5 skutterudite composites were systematically investigated after different thermal annealing time at 773 K in vacuum. Interior pores and surface bulges are formed clearly in the annealed sample. After 120 h annealing, the porosity of the sample increases by 10 %. However, the elemental composition and the phase composition remain stable after thermal annealing. The electrical conductivity and the thermal conductivity simultaneously decline due to the higher porosity in the annealed sample, but the thermal conductivity reduces more remarkably. In addition, the Seebeck coefficient changes slightly after annealing. As a result, the ZT value increases by 20 % after 120 h annealing. The results show that the annealing treatment can improve the ZT value of the TiN/Co4Sb11.5Te0.5 nanocomposites to some extent, but it will also degrade the structure of the sample, and cause the decrease of the sample’s mechanical prosperities.