提升N型Bi-Sb-Te-Se基热电材料性能的制造方法

本申请公开了一种提升N型Bi‑Sb‑Te‑Se基热电材料性能的制造方法。提升N型Bi‑Sb‑Te‑Se基热电材料性能的制造方法包括：按化学式Bi2‑xSbxTe3‑ySey+zwt％Te中各元素的化学计量比称量金属颗粒作为原料混合熔炼得到母合金，其中0≤x≤2、0≤y≤3、0≤z≤30；将母合金置于真空球磨机中球磨成纳米级粉末，纳米级粉末为包括Bi2‑xSbxTe3‑ySey与Te的多相材料；利用放电等离子烧结技术将纳米级粉末烧结成块体以获得N型Bi‑Sb‑Te‑Se基热电材料，其中，放电等离子烧结技术中的烧结温度高于Te相的熔点且低于Bi2‑xSbxTe3‑ySey的熔点。本申请实施方式提供的提升N型Bi‑Sb‑Te‑Se基热电材料性能的制造方法通过球磨工艺球磨母合金，并通过液相烧结技术烧结球磨后得到的纳米级粉末来提升N型Bi‑Sb‑Te‑Se基热电材料的热电性能。

The invention discloses a manufacturing method for improving the performance of an N-type Bi-Sb-Te-Se-based thermoelectric material. The manufacturing method for improving the performance of the N-type Bi-Sb-Te-Se-based thermoelectric material comprises the steps of weighing metal particles according to the stoichiometric ratio of elements in a chemical formula BiSbxTeSey+zwt%Te to serveas raw materials to be mixed and smelted to obtain mother alloy, wherein x is greater than or equal to 0 and less than or equal to 2, y is greater than or equal to 0 and less than or equal to 3, andz is greater than or equal to 0 and less than or equal to 30; placing the mother alloy in a vacuum ball mill to be subjected to ball milling into nanoscale powder, wherein the nanoscale powder is a multiphase material comprising BiSbxTeSey and Te; and sintering the nanoscale powder into a block by utilizing a spark plasma sintering technology to obtain the N-type Bi-Sb-Te-Se-based thermoelectric material, wherein the sintering temperature in the spark plasma sintering technology is higher than the melting point of a Te phase and lower than the melting point of BiSbxTeSey. According to the manufacturing method for improving the performance of the N-type Bi-Sb-Te-Se-based thermoelectric material provided by the embodiment of the invention, the mother alloy is subjected toball milling through a ball milling process, and the nanoscale power obtained after ball milling is sintered through a liquid phase sintering technology so as to improve the thermoelectric performance of the N-type Bi-Sb-Te-Se-based thermoelectric material.