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Preparation method for bismuth telluride based sintered fuel

A sintered material, a bismuth telluride-based technology, which is applied to the preparation of bismuth telluride-based materials and the field of preparation of bismuth telluride-based sintered materials, can solve the problems of complex preparation process, impurities and the like

Inactive Publication Date: 2012-08-08
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The object of the present invention is to provide a Bi 2 Te 3 based sintered material preparation method to address the Bi 2 Te 3 The complex preparation process of the base sintered material and the introduction of impurities make the sintered material have a good degree of orientation and obtain good performance

Method used

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  • Preparation method for bismuth telluride based sintered fuel
  • Preparation method for bismuth telluride based sintered fuel
  • Preparation method for bismuth telluride based sintered fuel

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Embodiment 2

[0022] Use 24% Bi 2 Te 3 +76%Sb 2 Te 3 +3wt%Te P type, 93%Bi 2 Te 3 +7% Bi 2 Se 3 +0.15wt%TeI 4 Use corundum sand, sandblasting to remove oxides and other impurities on the surface, and then ultrasonically clean for 5 minutes. After drying, it is placed in a mold for pre-pressing at a pressure of 20MPa, and then the pre-compressed ingot material is combined with the mold Put them into the spark plasma sintering equipment together, evacuate to 6Pa, energize and press for sintering. The initial current of P-type sintering is 600A, and then increase by 200A every minute until the sintering temperature reaches 390°C and the holding time is 8 minutes to obtain P-type sintered material; the initial current of N-type sintering is 450A, and then increase by 150A every minute. The sintering temperature reaches 450°C, and the temperature is kept for 12 minutes to obtain an N-type sintered material. These sintered materials are used to cut thermoelectric elements of 1.5mm×1.28mm×1.28mm, a...

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Abstract

The invention relates to a method for preparing a bismuth telluride based sintering material and belongs to the technical field of thermoelectric conversion. The method comprises the steps of preheating of crystal bar material, pre-compressing and spark plasma fast sintering, and is characterized in that in the process of spark plasma fast sintering, the crystal bar is sintered by direct compression, thus obtaining the sintering material. The sintering temperature in the process of spark plasma fast sintering is controlled within 390 to 450 DEG C, the heat preservation time is 8 to 10 minutes, and the sintering pressure is 35 to 60MPa. The prepared bismuth telluride based sintering material keeps original orientation of the crystal bar material. The method needs no complicated powdering process, saves the working hour of powdering and reduces impurity and material loss caused by the powdering process.

Description

Technical field [0001] The invention relates to a method for preparing a bismuth telluride-based sintered material, in particular to a method for preparing a bismuth telluride-based material with good workability and thermoelectric performance, belonging to the technical field of thermoelectric conversion Background technique [0002] Thermoelectric cooling is a technology that uses the Peltier effect of semiconductor materials to achieve direct conversion between electrical energy and heat. It has the advantages of precise temperature control, convenient and flexible installation, and no harmful substances (such as Freon) during work. It is used in IT technology, etc. High-tech fields have been widely used. [0003] Bi 2 Te 3 The crystal structure is R 3 m trigonal crystal system, such as figure 1 As shown, it can be regarded as a hexahedral layered structure along the C axis, with the same atomic species on the same layer, and between layers [0004] Te (1) Bi Te (2) Bi Te (1) A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/46C01B19/04C01G29/00H01L35/16H10N10/852
Inventor 李小亚陈立东夏绪贵吴燕青
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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