n型碲化铋基材料的制备及其热电性能研究

发布时间：2018-05-01 06:38

本文选题：热电材料 + n型碲化铋基材料　；参考：《稀有金属与硬质合金》2017年04期

【摘要】：以Bi_2Te_(2.7)Se_(0.3)为基础配比,99.99%的高纯Te、Bi、Se为原料,通过高温真空熔炼合金化-无氧环境机械粉碎-精密筛分制粉-独创热压装置快速热压工艺,制备出块体n型碲化铋基热电材料。采用粒度分析仪、扫描电镜、氧氮分析仪对合金粉末的粒度和氧含量进行了测定,用X射线衍射仪对合金粉末的物相结构进行了表征,并对热压块体样品的抗弯强度进行测试。热电性能测试结果显示,所制备热压块体样品不同方向的Seebeck系数和ZT值(热电优值系数)基本相同,但电阻率和热导率有不同程度的取向,但与市购区熔热电材料相比取向度明显降低。热压块体样品的相对密度高达99%,抗弯强度达到87 MPa,最高ZT值约为0.7。该工艺的生产设备简单可靠,生产成本低,工作效率高,适合产业化。
[Abstract]:Based on Bi2TeSe 0.3), high purity Teo BiSe with 99.99% ratio is used as raw material to prepare bulk n-type bismuth telluride thermoelectric material by high temperature vacuum melting alloying, mechanical pulverization in anaerobic environment, precision screening powder making and original hot pressing device. The particle size and oxygen content of the alloy powder were measured by particle size analyzer, scanning electron microscope and oxygen nitrogen analyzer. The phase structure of the alloy powder was characterized by X-ray diffractometer, and the bending strength of the hot pressed bulk sample was measured. The results of thermoelectric properties test show that the Seebeck coefficient and ZT value (thermoelectric excellent value coefficient) of the prepared hot-pressed bulk samples are basically the same, but the resistivity and thermal conductivity have different orientations. However, the orientation degree is obviously lower than that of the melting thermoelectric materials. The relative density of hot pressed bulk samples is as high as 99. The bending strength is 87 MPA and the highest ZT value is about 0.7. The production equipment of this process is simple and reliable, the production cost is low, the work efficiency is high, and it is suitable for industrialization.
【作者单位】：广东省稀有金属研究所广东省稀土开发及应用重点实验室;
【基金】：国家自然科学基金(514040782) 广东省省级科技计划项目(2017A010103012)
【分类号】：TB34

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