【摘要】 采用高温熔炼、高能球磨、冷压成型和气氛保护烧结工艺制备了块体热电材料,研究了熔体冷却速度对In_0.01Bi_1.99Te_2.7Se_0.3热电材料显微组织与热电性能的影响.利用XRD、EDS、SEM、DSC、热电测试仪、激光热导仪等测试了热电材料的物相、晶粒大小、元素组成和含量、表面形貌和塞贝克系数、电导率、热导率.结果表明:冷却速度对物相无影响,热电材料物相均为Bi₂Te_2.7Se_0.3相;冷却速度越快,成分越均匀、晶粒越细;液氮冷却的热电材料室温（300K）塞贝克系数增大到173μV/K、电导率为4.85×104S/m、热导率减小至0.701 W·m-1·K-1,热电优值达到0.62.更多还原

【Abstract】 The bulk thermoelectric material is prepared by high temperature melting,high energy ball milling,cold pressure forming and atmosphere protection sintering process. The influence of melt cooling rate on the microstructure and properties of In_0.01Bi_1.99Te_2.7Se_0.3 thermoelectric material is studied. The phase,grain size,elemental composition and content,surface morphology and Seebeck coefficient,electrical conductivity and thermal conductivity of the thermoelectric material are tested by XRD,EDS,SEM,DSC,thermoelectric tester,laser thermal conductivity instrument,etc. The results show that the cooling rate has no effect on the phase of the material. The phase of the thermoelectric material is Bi₂Te_2.7Se_0.3. The faster the cooling rate,the more uniform the components and the finer the crystal grains. When the liquid nitrogen cooled thermoelectric material is tested at room temperature（300 K）,the Seebeck coefficient increases to 173 μV/K,the electrical conductivity is 4. 85 ×104 S/m,the thermal conductivity decreases to 0. 701 W · m-1·K-1,and the thermoelectric figure of merit reaches 0. 62.更多还原