Bi_2Te_3合金低温热电性能及冷能发电研究

Cryogenic thermoelectric properties of BiTe-based alloys and cryo-energy power generation

利用机械合金化和冷压烧结法制备得到n型和p型Bi2Te3基热电材料,在80—300K温度范围测量了电导率、Seebeck系数,结果表明其具有良好的低温热电性能.采用Bi2Te3基热电材料制备出半导体热电器件,并配合附属设备搭建出一套半导体温差发电装置.利用液氮汽化时释放的冷能,对半导体热电器件的发电性能进行实验研究,得出这种半导体热电器件输出电压、输出功率与电流关系式,测得最大的输出功率达到1.33W,从而证明了冷能发电的可行性。

The BiTe-based alloys were fabricated by mechanical alloying and cold-pressing sintering.Seebeck coefficient and electrical conductivity were measured at the temperature range of 80—300 K.Results showed that the thermoelectric properities of the materials were excellent during the experiments.With the thermoelectric conversion device made of BiTebased alloys,a new cryo-energy utilization equipment were established.By applying liquid nitrogen in the experiments,the cryo-energy was released during evaporation of liquid nitrogen,and then,a study of electric properties of thermoelectric conversion devices was further deployed.The relationship of output voltage and output power versue current intensity was obtained from the experiments.The maximum output power in the experiments was up to 1.33 W,which verified the feasibility of cryo-energy power generation.