中文摘要：

采用真空熔炼制备了三元Bi2Te2.7Se0.3合金材料，再利用热压烧结法烧结成型，用XRD和SEM对材料物相成分和形貌进行了表征。结果表明，Bi、Te、Se单质粉末经真空熔炼形成了单相Bi2Te2.7Se0.3，合金，热压烧结过程中未发生相变反应，热压烧结后仍为单相Bi2Te2.7Se0.3;热压烧结后热电材料在微观结构上存在各向异性，沿垂直于压力方向产生优化取向，沿（0001）面的解理断裂局限在单颗晶粒的尺寸范围。这预示着能够在增强材料力学性能的同时提高热电件能．

英文摘要：

The vacuum melting method was used to prepare Bi2Te2.7Se0.3 alloy powders, and hot-pressing sintering method was used to consolidate the powders into bulk material. The chemical composition and morphology were characterized by XR.D and SEM. The results show that Bi, Te and Se elemental powders can change irtto single-phase of Bi2Te2.7Se0.3 after vacuum melting. There is no phase transition reaction during hot-pressing sintering process. The hot-pressed alloy is anisotropic in the microstructure and preferentially oriented along perpendicular to the pressure direction and the cleavage fracture along the （0001） plane is confined to a single grain size range, which can enhance the mechanical properties and improve the thermo-electric performance.