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Combustion synthesis method of Bi2SeO2-based thermoelectric material and combustion improver for Bi2SeO2-based thermoelectric material

A technology of combustion synthesis and thermoelectric materials, which is applied in chemical instruments and methods, lead monoxide, selenium/tellurium compounds, etc., can solve the problems of limited fields and scope, time and energy consumption, high temperature, etc., and achieve optimal thermoelectric performance and preparation The effect of ultra-short time and low equipment requirements

Active Publication Date: 2015-12-16
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Currently, the preparation of Bi 2 SeO 2 The compound mainly adopts a long-term solid-state reaction method, which has a long preparation period, high temperature required, time-consuming and energy-consuming, high requirements on equipment and high dependence, and high cost of large-scale preparation, which greatly limits its scale. Field and scope of application

Method used

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  • Combustion synthesis method of Bi2SeO2-based thermoelectric material and combustion improver for Bi2SeO2-based thermoelectric material
  • Combustion synthesis method of Bi2SeO2-based thermoelectric material and combustion improver for Bi2SeO2-based thermoelectric material
  • Combustion synthesis method of Bi2SeO2-based thermoelectric material and combustion improver for Bi2SeO2-based thermoelectric material

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Embodiment 1

[0029] A combustion synthesis of Bi 2 SeO 2 A combustion aid for thermoelectric materials, the combustion aid is PbO powder.

[0030] A Bi 2 SeO 2 Combustion synthesis method of base thermoelectric materials, with Bi, Se, Bi 2 o 3 As a raw material, PbO compound was used as a combustion aid to try a self-propagating combustion synthesis reaction to prepare Bi 2(1-x) Pb 2x SeO 2 Thermoelectric material powder, the specific steps are as follows:

[0031] 1) Weigh Bi, Se, Bi according to the molar ratio of (2-2x): 3: (2-2x): 6x (wherein x is 0, 0.04, 0.06, 0.1 respectively) 2 o 3 , 4 parts of PbO powder, each 5g, coded as A, B, C, D respectively. Then they were mixed evenly to obtain reactants A, B, C, and D respectively, and were pressed at 4 MPa for 5 minutes, and pressed into a cylindrical ingot with a diameter of 10 mm;

[0032] 2) At room temperature, the ingot obtained in step 1) was vacuum-sealed in a quartz glass tube, and the bottom end of the glass tube was m...

Embodiment 2

[0036] A combustion synthesis of Bi 2 SeO 2 A combustion aid for thermoelectric materials, the combustion aid is PbO powder.

[0037] A Bi 2 SeO 2 Combustion synthesis method of base thermoelectric materials, with Bi, Se, Bi 2 o 3 As a raw material, PbO compound was used as a combustion aid to try to trigger a thermal explosion reaction to prepare Bi 2(1-x) Pb 2x SeO 2 Thermoelectric material powder, the specific steps are as follows:

[0038] 1) Weigh Bi, Se, Bi according to the molar ratio of (2-2x): 3: (2-2x): 6x (wherein x is 0, 0.04, 0.06, 0.1 respectively) 2 o 3 , 4 parts of PbO powder, each 5g, respectively numbered as A, B, C, D and mixed evenly to obtain reactants A, B, C, D respectively, and kept under pressure at 4MPa for 5min, and pressed into a cylinder with a diameter of 10mm shape ingot;

[0039] 2) Vacuum-seal the ingots obtained in step 1) into quartz glass tubes, quickly put them in a muffle furnace at 500°C for 2 minutes, take them out immediately...

Embodiment 3

[0043] A combustion synthesis of Bi 2 SeO 2 A combustion aid for thermoelectric materials, the combustion aid is PbO powder.

[0044] A Bi 2 SeO 2 Combustion synthesis method of base thermoelectric materials, with Bi, Se, Bi 2 o 3 As a raw material, PbO compound was used as a combustion aid to try to trigger a thermal explosion reaction under different temperature conditions to prepare Bi 1.8 Pb 0.2 SeO 2 Thermoelectric material powder, the specific steps are as follows:

[0045] 1) Weigh the raw materials Bi, Se, Bi at a molar ratio of 3:5:3:1 2 o 3 , 4 parts of PbO powder, each 5g, respectively numbered as A, B, C, D, mixed evenly to obtain reactants A, B, C, D, respectively, and kept at 4MPa for 5min, pressed into a cylinder with a diameter of 10mm shape ingot;

[0046] 2) Vacuum-seal the ingot obtained in step 1) into a quartz glass tube, quickly put raw material A in a muffle furnace at 500°C for 3 minutes, put raw material B in a muffle furnace at 700°C for 3 ...

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Abstract

The invention discloses a combustion synthesis method of a Bi2SeO2-based thermoelectric material and a combustion improver for the Bi2SeO2-based thermoelectric material. By taking Bi, Se and Bi2O3 as raw materials, the method adopts a PbO compound as the combustion improver to promote combustion synthesis reaction to prepare the Bi2(1-x)Pb2xSeO2 thermoelectric material. The method disclosed by the invention has the advantages of being short in preparation time, simple in process, low in requirement on equipment, energy-saving and environmental-friendly, suitable for scaled production and the like, thereby laying a good foundation for scaled preparation and application of the Bi2SeO2-based thermoelectric material.

Description

technical field [0001] The invention belongs to the technical field of thermoelectric material preparation, in particular to a Bi 2 SeO 2 Combustion synthesis method of base thermoelectric material and its combustion enhancer. Background technique [0002] Due to the increasingly severe energy shortage and environmental pollution, the research and development of new energy materials and new energy conversion technologies has become a hot spot of widespread concern in the world. Thermoelectric materials are environmentally friendly new energy materials and have broad commercial application prospects in thermoelectric power generation and thermoelectric refrigeration technologies. The conversion efficiency of thermoelectric materials is determined by the dimensionless thermoelectric figure of merit ZT (ZT=α 2 σT / κ (where α is the Seebeck coefficient, σ is the electrical conductivity, κ is the thermal conductivity, and T is the absolute temperature), the larger the ZT, the h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/00C01G21/06
Inventor 唐新峰杨东旺胡铁铮苏贤礼鄢永高
Owner WUHAN UNIV OF TECH
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