快速非平衡技术制备ZrNiSn及其纳微结构与热电性能  

Microstructure and Thermoelectric Transport Behavior of ZrNiSn Material Synthesized by Non-Equilibrium Technology

作　　者：杨东旺 罗婷婷 苏贤礼[1] 鄢永高[1] 唐新峰[1] YANG Dongwang;LUO Tingting;SU Xianli;YAN Yonggao;TANG Xinfeng(State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan 430070,China;Materials Research and Test Center of Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]材料复合新技术国家重点实验室,武汉430070 [2]武汉理工大学材料研究与测试中心,武汉430070

出　　处：《硅酸盐学报》2021年第3期597-604,共8页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金重点项目(复合热电材料的界面调控与电热输运,51632006)。

摘　　要：利用外加引火剂的自蔓延高温合成(SHS)反应形成的"化学反应加热炉"引发ZrNiSn的SHS反应,在反应物坯体处于红热软化状态下快速加压制备得到致密的ZrNiSn块体。对材料物相及微结构进行表征,并对热电性能进行测试。结果表明:ZrNiSn内部存在大量纳米晶核和高浓度位错群及应力起伏区,极大地增强了声子散射,显著减小了声子平均自由程,进而降低了晶格热导率,并且热电性能得到优化,在873K时,ZT值为0.54。ZrNiSn bulk thermoelectric materials were synthesized by a self-propagating high-temperature synthesis(SHS) process.Phases and microstructure of ZrNiSn were investigated.Its thermoelectric property was tested.The results show that there are a large number of nuclei and high concentration of dislocation groups and stress fluctuation area inside the dense material,greatly enhancing the phonon scattering and reducing the phonon mean free paths,thus leading to the decreased lattice thermal conductivity of the materials.The thermoelectric properties of the material were optimized,and the ZT value is 0.54 at 873 K.

关 键 词：化学炉 自蔓延高温合成 half-Heusler合金 缺陷 热电 

分 类 号：TB34[一般工业技术—材料科学与工程]