Preparation method of P-type bismuth telluride-based bulk thermoelectric material (Bi1-xSbx)2Te3

Abstract

The invention discloses a preparation method of a P-type bismuth telluride-based bulk thermoelectric material (Bi1-xSbx)2Te3. The preparation method comprises the following steps: simple substance rawmaterials Bi, Sb and Te powders are weighed according to the chemical formula content of (Bi1-xSbx)2Te3, are added into a quartz tube, and are homogenized for 2h, and the tube is vacuumized and sealed, and is fixed on the vertical lifting frame of a vertical solidification furnace; the quartz tube vertically descends into the heating zone of the vertical solidification furnace with the vertical lifting frame at a rate of 2 cm/h, stops descending after the obtained material in the quartz tube completely passes through the heating zone, and undergoes heat insulation in the heating zone for a certain period of time, then heating is stopped, and the quartz tube undergoes furnace cooling in the vertical solidification furnace to room temperature, and is taken out and crushed to obtain the complete P-type bismuth telluride-based bulk thermoelectric material. The method of the invention has the advantages of high production efficiency, low industrial production cost and high automation degree, and the prepared bismuth telluride product has the advantages of high density, low heat conductivity, high electrical conductivity and high thermoelectric figure of merit.

Description

technical field [0001] The invention relates to a P-type bismuth telluride-based bulk thermoelectric material (Bi 1-x Sb x ) 2 Te 3 The preparation method belongs to the technical field of thermoelectric material preparation. Background technique [0002] Thermoelectric conversion technology has always been one of the research hotspots in the future energy industry, and the improvement of the performance of thermoelectric materials is a key node in the development of thermoelectric conversion technology. Thermoelectric materials, also known as thermoelectric power generation materials, are one of the functional materials that use the unique properties of thermoelectric materials to convert heat and electricity into each other. They have many advantages such as environmental friendliness, low production costs, and long service life. [0003] Bi 2 Te 3 The base compound is the earliest thermoelectric material discovered and studied. Since its discovery in the last centur...

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Problems solved by technology

Although the preparation process of the zone melting method can obtain bismuth telluride-based thermoelectric materials with excellent grain orientation, composition segregation often occurs during the transition from the liquid phase to the solid phase during the melting and casting process, and the low melting points such as Bi and Te in the molten state The elements are volatile, which not only leads to a decrease in the utilization rate of the material, but also reduces the ZT value of the material, and because the material obtained by this process is easy to cleavage along the (00l) plane, the mechanical properties of the material are poor, making the material difficult to process and use, thus hindering the wider application space of the material

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