PbTe块体材料的半固态粉末成形制造及其热电性能研究

发布时间：2018-05-21 03:40

  本文选题：PbTe热电材料 + 半固态粉末成形法　； 参考：《浙江大学》2015年硕士论文

【摘要】：本学位论文结合国家自然科学基金项目“基于热电材料的层叠阵列型温差发电构件及其半固态粉末微成形理论与研究方法”(资助号：51175460),以中温段热电材料碲化铅(PbTe)作为研究对象,开展了PbTe块体材料的半固态粉末成形制造及其热电性能研究。首先,提出了将半固态粉末成形技术应用于PbTe块体热电材料的制造,并确定了具体制造工艺和所得块体热电材料的测试方法。其次,采用半固态粉末成形法制造了n型PbTe块体热电材料,分析了所得块体热电材料的物相和微观组织形貌,对比研究了其热电性能。在此基础上,研究了高能球磨法对n型PbTe块体热电材料性能的影响,分析了不同球磨时间条件下制备的n型PbTe纳米粉末的物相、微观组织形貌和化学组成,并研究了用该最优纳米粉末制造得到的n型PbTe块体热电材料的性能。最后,采用高能球磨法制备了p型PbTe纳米粉末,分析了所得纳米粉末的物相与微观形貌,并将纳米粉末采用半固态粉末成形工艺制造成p型PbTe块体热电材料,对比分析了所得块体热电材料的微观组织形貌及其热电性能。第1章,阐述了本学位论文研究的背景与意义,详细介绍了热电材料及其制备和制造工艺的研究现状,在此基础上,提出了本学位论文的主要研究内容和论文框架。第2章,针对PbTe块体热电材料的晶粒尺寸难以控制,样品机械性能差以及无法实现大批量、低成本和高效率的生产等制造难题,提出了将半固态粉末成形技术应用于PbTe块体热电材料的制造,并确定了具体制造工艺和所得块体热电材料的测试方法。第3章,采用半固态粉末成形法制造了n型PbTe块体热电材料,分析了所得块体热电材料的物相和微观组织形貌,研究了其物理性能、热电性能和机械性能,并与常规制造方法制造的块体热电材料进行了对比分析。第4章,研究了高能球磨法对n型PbTe块体热电材料性能的影响,分析了不同球磨时间条件下制备的n型PbTe纳米粉末的物相、微观组织形貌和化学组成,并研究了用该最优纳米粉末制造得到的n型PbTe块体热电材料的性能。第5章,采用高能球磨法制备了p型PbTe纳米粉末,分析了所得纳米粉末的物相与微观形貌,并将纳米粉末采用半固态粉末成形工艺制造成p型PbTe块体热电材料,对比分析了所得块体热电材料的微观组织形貌及其热电性能。第6章,总结了论文的主要研究工作,并展望了未来的研究工作。
[Abstract]:This dissertation is based on the National Natural Science Foundation of China, "stacked array thermoelectric components based on thermoelectric materials and their semi-solid powder microforming theory and research methods" (Grant No.: 51175460). PbTe2 as a research object, The semi-solid powder forming and thermoelectric properties of PbTe bulk materials were studied. Firstly, the semi-solid powder forming technology is applied to the manufacture of PbTe bulk thermoelectric material, and the specific manufacturing process and the test method of the obtained bulk thermoelectric material are determined. Secondly, n-type PbTe bulk thermoelectric materials were fabricated by semi-solid powder forming method. The phase and microstructure of the bulk thermoelectric materials were analyzed and the thermoelectric properties were compared. On this basis, the effect of high-energy ball milling on the properties of n-type PbTe bulk thermoelectric materials was studied. The phase, microstructure and chemical composition of n-type PbTe nano-powders prepared under different milling time were analyzed. The properties of n-type PbTe bulk thermoelectric materials fabricated from the optimized nano-powders were studied. Finally, p-type PbTe nanocrystalline powder was prepared by high-energy ball milling method. The phase and microstructure of the nano-powder were analyzed, and the p-type PbTe bulk thermoelectric material was prepared by semi-solid powder forming process. The microstructure and thermoelectric properties of the bulk thermoelectric materials were compared and analyzed. In chapter 1, the background and significance of this dissertation are described, and the research status of thermoelectric materials, their preparation and manufacturing processes are introduced in detail. On the basis of this, the main research contents and the framework of this dissertation are put forward. In Chapter 2, the grain size of PbTe bulk thermoelectric materials is difficult to control, the mechanical properties of samples are poor, and the manufacturing problems such as mass production, low cost and high efficiency can not be realized. The semi-solid powder forming technology is applied to the manufacture of PbTe bulk thermoelectric material, and the specific manufacturing process and the test method of the obtained bulk thermoelectric material are determined. In chapter 3, n-type PbTe bulk thermoelectric materials were fabricated by semi-solid powder forming method. The phase and microstructure of the bulk thermoelectric materials were analyzed, and their physical, thermoelectric and mechanical properties were studied. The results are compared with the bulk thermoelectric materials made by conventional manufacturing methods. In chapter 4, the effect of high-energy ball milling on the properties of n-type PbTe bulk thermoelectric materials was studied. The phase, microstructure and chemical composition of n-type PbTe nano-powders prepared under different milling time were analyzed. The properties of n-type PbTe bulk thermoelectric materials fabricated from the optimized nano-powders were studied. In chapter 5, p-type PbTe nanocrystalline powder was prepared by high-energy ball milling. The phase and microstructure of the nano-powder were analyzed, and the p-type PbTe bulk thermoelectric material was prepared by semi-solid powder forming process. The microstructure and thermoelectric properties of the bulk thermoelectric materials were compared and analyzed. Chapter 6 summarizes the main research work and looks forward to the future research work.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB34

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本文编号：1917606