Method for preparing Ag-Pb-Sb-Te-Se thermoelectric material

An ag-pb-sb-te-se, thermoelectric material technology, which is applied in the fields of polycrystalline material growth, chemical instruments and methods, and ultra-high pressure application processes, etc. Special preparation process and other problems, to achieve the effect of suitable for large-scale industrial production, low thermal conductivity, simple process

Inactive Publication Date: 2011-08-31
HENAN POLYTECHNIC UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0004]2004 Hus et al (Kuei Fang Hsu et al, Cubic AgPbmSbTe2+m: Bulk Thermoelectric Materials with High Figure of Merit, Science 303 (2004) 818-821) first reported AgPb18SbTe20System thermoelectric materials, in which Ag1-xPb18SbTe20 with a small amount of Ag segregation has the highest thermoelectric performance, which is considered to be the best thermoelectric performance at present. The highest bulk material, but its preparation process is relatively special, and the detailed process is unknown
These methods all have the disadvantages of complex preparation process, long synthesis cycle, high energy consumption, and low power factor of prepared samples.

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  • Method for preparing Ag-Pb-Sb-Te-Se thermoelectric material
  • Method for preparing Ag-Pb-Sb-Te-Se thermoelectric material

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Embodiment 1

[0021] Preparation of Ag 0.8 Pb 18 SbT 20-x Se x For thermoelectric materials, the value of x is 0, that is, when x=0, the preparation of Ag 0.8 Pb 18 SbT 20 Thermoelectric materials, the steps are as follows:

[0022] The first step, material selection and ingredients: the raw materials are high-purity Ag powder (purity 99.9%), Pb powder (purity 99.9%), Sb powder (purity 99.999%) and Te powder (purity 99.999%); 0.8 Pb 18 SbT 20 Stoichiometric ratio Weigh the raw materials, and mix them in a vacuum glove box under the protection of argon for 1 hour, so that the raw materials are fully mixed and even;

[0023] The second step, sintering: put the above-mentioned homogeneously mixed raw materials into a steel mold, press them into discs with a hydraulic press, and put them into a six-sided high-temperature and high-pressure reaction chamber after assembly for high-temperature and high-pressure reaction. The synthesis pressure is set to 4 GPa, the temperature is 930°C, h...

Embodiment 2

[0027] When x=5, prepare Ag 0.8 Pb 18 SbT 15 Se 5 Thermoelectric materials, the steps are as follows:

[0028] The first step, material selection and ingredients: the raw materials are Ag powder with purity ≥99.9%, Pb powder with purity ≥99.9%, Sb powder with purity ≥99.999%, Te powder with purity ≥99.999% and Se powder with purity ≥99.95%; by Ag 0.8 Pb 18 SbT 15 Se 5 Stoichiometric ratio Weigh the raw materials, and mix them in a vacuum glove box under the protection of argon for 1 hour, so that the raw materials are fully mixed and even;

[0029] The second step, sintering: put the uniformly mixed raw materials into a steel mold, and use a hydraulic press to press them into discs. After assembly, put them into a six-sided high-temperature and high-pressure reaction chamber for high-temperature and high-pressure reaction. The preparation pressure is set to 4 GPa, the temperature is 960 ° C, heat preservation and pressure holding for 20 minutes;

[0030] The third ste...

Embodiment 3

[0033] When x=10, prepare Ag 0.8 Pb 18 SbT 10 Se 10 Thermoelectric materials, the steps are as follows:

[0034] The first step, material selection and ingredients: the raw materials are high-purity Ag powder (purity 99.9%), Pb powder (purity 99.9%), Sb powder (purity 99.999%), Te powder (purity 99.999%) and Se powder (99.95% pure); by Ag 0.8 Pb 18 SbT 10 Se10 Weigh the raw materials and mix them in a vacuum glove box under the protection of argon for 1 hour, so that the raw materials are fully mixed and even;

[0035] In the second step, put the uniformly mixed above-mentioned raw materials into a steel mold, and use a hydraulic press to press them into discs. After the assembly is completed, put them into a six-sided high-temperature and high-pressure reaction chamber for high-temperature and high-pressure reaction. The preparation pressure is set to 4 GPa, the temperature is 990°C, and the temperature is kept for 20 minutes;

[0036] The third step is to cut off the...

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Abstract

The invention discloses a method for preparing an Ag-Pb-Sb-Te-Se thermoelectric material, comprising the following steps of: 1, weighing Ag powder, Sb powder, Te powder and Se powder based on the stoichiometric ratio of Ag0.8Pb18 SbTe20-xSex, and then putting the powders in a vacuum glove box under the protection of argon and uniformly mixing, wherein x is equal to 0 to 15; 2, sintering the mixed material at a temperature from 930 to 1020 DEG C for 20 minutes under the pressure of 4Gpa; and 3, stopping heating and relieving pressure to obtain an Ag0.8Pb18 SbTe20-xSex alloy. The method of the invention can effectively settle the problems in the prior art and has the advantages of being short in cycle, simple in process, fast in material synthesis, low in cost and high in sample density, saving energy, adapting to large-scale industrial production and the like, and simultaneously, the prepared product has higher powder factor and lower thermal conductivity.

Description

technical field [0001] The invention belongs to the technical field of thermoelectric material preparation, and in particular relates to a preparation method of Ag-Pb-Sb-Te-Se thermoelectric material. Background technique [0002] Thermoelectric material is a functional material that can realize direct conversion of thermal energy and electrical energy. It can be used to make thermoelectric generators or thermoelectric refrigeration equipment. These thermoelectric devices do not have any mechanical moving parts and do not need flowing substances as energy conversion media. Therefore, they have Light weight, small size, portable, reliable performance, no pollution, no noise, long service life and other advantages. At present, thermoelectric materials have been widely used in refrigeration, space vehicle power supply, mobile power supply and other fields. In recent years, with the increasingly prominent energy shortage and environmental pollution, thermoelectric materials, a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/46C30B1/00B01J3/06
Inventor 宿太超李小雷李尚升朱红玉胡强马红安贾晓鹏
Owner HENAN POLYTECHNIC UNIV
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