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

A thermoelectric material, bismuth telluride technology, is applied in the field of preparation of P-type bismuth telluride-based bulk thermoelectric material 2Te3, which can solve the problems of difficult processing and use of materials, volatile low-melting elements, and hindering the application space of materials, etc. Low production cost, high thermoelectric figure of merit, and high density

Active Publication Date: 2019-06-07
CNBM CHENGDU OPTOELECTRONICS MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

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preparation example Construction

[0025] The invention provides a P-type bismuth telluride-based bulk thermoelectric material (Bi 1-x Sb x ) 2 Te 3 The preparation method, it comprises the steps:

[0026] (1) The elemental raw materials Bi, Sb, and Te powder are pressed by (Bi 1-x Sb x ) 2 Te 3 , 0.05≤x≤0.2, the chemical formula content is weighed and loaded into a quartz tube;

[0027] (2) Use homogenization equipment to homogenize the raw materials in the quartz tube for 2 hours, then vacuumize and seal the tube, and then fix it on the vertical lifting frame of the vertical solidification furnace;

[0028] (3) Preheat the vertical solidification furnace. The preheating temperature is 250-300°C, and the preheating and holding time is 30 minutes. Heating zone, the heating temperature of the heating zone is 500-560°C, when all the materials in the quartz tube pass through the heating zone, the quartz tube stops falling, and the heating zone stops heating after holding for a certain period of time; the h...

Embodiment 1

[0039] A P-type bismuth telluride-based bulk thermoelectric material (Bi 1-x Sb x ) 2 Te 3 The preparation method, it comprises the steps:

[0040] (1) Press (Bi 1-x Sb x ) 2 Te 3 , 0.05≤x≤0.2, chemical formula content Weigh 500g of elemental raw materials Bi, Sb, Te powder into a φ60×600mm quartz tube;

[0041] (2) Use homogenization equipment to homogenize the raw materials in the quartz tube for 2 hours, then vacuumize and seal the tube, and then fix it on the vertical lifting frame of the vertical solidification furnace;

[0042] (3) Preheat the vertical solidification furnace. The preheating temperature is 280°C, and the preheating holding time is 30 minutes. After preheating, the quartz tube falls vertically with the vertical lifting frame at a rate of 2cm / h and enters the heating zone of the vertical solidification furnace. , the heating temperature in the heating zone is 540°C. When all the materials in the quartz tube pass through the heating zone, the quartz tu...

Embodiment 2

[0045] A P-type bismuth telluride-based bulk thermoelectric material (Bi 1-x Sb x ) 2 Te 3 The preparation method, it comprises the steps:

[0046] (1) Press (Bi 1-x Sb x ) 2 Te 3 , 0.05≤x≤0.2, chemical formula content Weigh 300g of single raw material Bi, Sb, Te powder and put it into a φ60×600mm quartz tube;

[0047] (2) Use homogenization equipment to homogenize the raw materials in the quartz tube for 2 hours, then vacuumize and seal the tube, and then fix it on the vertical lifting frame of the vertical solidification furnace;

[0048] (3) Preheat the vertical solidification furnace. The preheating temperature is 250°C, and the preheating holding time is 30 minutes. After preheating, the quartz tube falls vertically with the vertical lifting frame at a rate of 2cm / h and enters the heating zone of the vertical solidification furnace. , the heating temperature in the heating zone is 500°C. When all the materials in the quartz tube pass through the heating zone, the ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/547C04B35/64H10N10/852
Inventor 彭寿马立云潘锦功傅干华周毅段杰明黎东升
Owner CNBM CHENGDU OPTOELECTRONICS MATERIAL
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