碲化铋基热电材料的热喷涂织构化制备与性能研究

项目名称： 碲化铋基热电材料的热喷涂织构化制备与性能研究

项目编号： No.51201175

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 金属材料学科

项目作者： 杨胜辉

作者单位： 西安交通大学

项目金额： 25万元

中文摘要： 本项目以碲化铋基热电材料为研究对象，拟采用热喷涂结合放电等离子烧结工艺制备具有纳米结构的织构化块体材料。通过快速冷却引入的纳米结构可明显降低晶格热导率，而织构化微结构则有利于提高电输运性能，因此有望改善其整体热电性能。需要探索制备工艺参数对微结构的影响规律，解析微结构特征对电声输运行为的作用机理，进而达到对微结构和热电输运性能进行协同优化的目的，最终获得高性能块体热电材料并完善相关制备技术的可控性。碲化铋基热电材料在室温附近的热电发电和制冷均具有很大的潜力和优势，本课题的实施对进一步认识微结构与性能之间的关联以及开发调控微结构的新方法具有指导意义。

中文关键词： 热喷涂；热电材料；纳米复合物；纳米结构；织构

英文摘要： The textured bismuth telluride based thermoelectric (TE) materials with nanostructure will be prepared by a combined method with thermal spray and spark plasma sintering in this project. Thermal conductivity can be remarkably reduced through nanostructure induced by high cooling rate; meanwhile, electrical properties can be increased by the formation of texture. Therefore, performance improvement will be achieved as expected in bulk materials with microstructure combined nanostructure and texture. In this project, the formation mechanism of this coexisted microstructure and influence of preparation parameters on microstructure will be investigated carefully. The effect and mechanism of this special microstructure on electron and phonon transport properties will be primarily researched. The coordinated optimization of microstructure and TE transport properties will be achieved in this project. Finally, bulk TE materials with high performance and controllable preparation technology will be attained based on the understanding of all the mechanism. Bismuth telluride based TE materials possess great advantage and potentiality for power generating and cooling near room temperature. The implementation of this project is favorable to understand the relationship of microstructure and properties and develop a new way to c

英文关键词： thermal spray；thermoelectric materials；nanocompisites；nanostructure；texture