Ag-Pb-Sb-Te thermoelectric materials and preparation process thereof

A thermoelectric material, ag-pb-sb-te technology, is applied in the direction of thermoelectric device junction lead-out materials, thermoelectric device manufacturing/processing, etc., and can solve the problem of long exposure time of materials, serious volatilization of components, long production cycle, etc. problems, achieve excellent thermoelectric performance, reduce volatilization, and reduce energy consumption

Active Publication Date: 2006-04-05
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This preparation process has the disadvantages of many procedures, complex equipment, long production cycle, high energy consumption, long exposure time of materials at high temperature, and serious volatilization of components.

Method used

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  • Ag-Pb-Sb-Te thermoelectric materials and preparation process thereof
  • Ag-Pb-Sb-Te thermoelectric materials and preparation process thereof
  • Ag-Pb-Sb-Te thermoelectric materials and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Using silver (Ag) powder, antimony (Sb) powder, lead (Pb) powder, tellurium (Te) powder as raw materials, according to Ag 0.8 Pb 22 SbT 20 Weigh a total of 20 g of powder, put it into a stainless steel ball mill jar (volume 250 mL), and add stainless steel balls with a diameter of 10 mm (the weight ratio of balls to powder is 18:1). The ball mill tank was filled with Ar as a protective gas, and Ag was prepared by mechanical alloying (MA) reaction in a planetary ball mill (QM-2, Nanjing University Instrument Factory) for 5 hours (rotation speed: 300r / min). 0.8 Pb 22 SbT 20 compound powder. Such as figure 1 As shown in (a), after the above MA treatment, the obtained powder becomes a single phase and has a cubic structure, and each diffraction peak can be calibrated according to the PbTe phase. The obtained powder is sintered at a pressure of 50Mpa at 400°C and kept for 2 minutes, and its relative density is all above 98% (see figure 2 SEM photo shown). Such as f...

Embodiment 2

[0034] Using silver (Ag) powder, antimony (Sb) powder, lead (Pb) powder, tellurium (Te) powder as raw materials, according to Ag 0.8 Pb 21 SbT 20 , Ag 0.8 Pb 22 SbT 20 , Ag 0.8 Pb 23 SbT 20 Metering ratio A total of 20 g of powder was weighed to prepare three groups of samples with different Pb contents. Powder synthesis and SPS sintering conditions are the same as in Example 1. image 3 and 4 Comparing the three compositions of Ag 1-X Pb 18+Y SbT 20 Resistivity () and Seebeck coefficient (S) of the compound's SPS sintered samples versus temperature. Compared with the other two compositions, Ag 0.8 Pb 22 SbT 20 It has the lowest resistivity, and the absolute value of its Seebeck coefficient is between the two. Figure 5 is to use image 3 and 4 The power factor (S 2 / vs. temperature. As shown in the figure, Ag 0.8 Pb 22 SbT 20 The power factor of the composition is the highest, reaching 1766W / mK at 650K. Figure 6 is the composition (Ag 0.8 Pb 22 SbT...

Embodiment 3

[0036] Using silver (Ag) powder, antimony (Sb) powder, lead (Pb) powder, tellurium (Te) powder as raw materials, according to Ag 0.8 Pb 22 SbT 20 , Ag 0.8 Pb 22 SbT 20 and Ag 0.8 Pb 22 SbT 20 A total of 20 g of powder was weighed to prepare three groups of samples with different Ag contents. Powder synthesis and SPS sintering conditions are the same as in Example 1. The room temperature resistivities of samples with silver contents of 0.4, 0.6 and 0.8 are 0.125m, 0.185m, 0.175×10 -3 m. The resistivities of the two samples with Ag contents of 0.4 and 0.6 are too high, and the samples with Ag contents of about 0.8 have much lower resistivities than the other two compositions. Therefore, its comprehensive thermoelectric performance is high, and the dimensionless figure of merit ZT is as high as 1.37.

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Abstract

The invention discloses new energy resource material and its preparing technique, relating to a Ag-Pb-Sb-Te thermoelectric material of thermoelectric semi-conductor compound with high thermoelectric effect and the relative preparing method. The invention utilizes the mechanical alloying (MA) combined with discharge plasma sinter (SPS) to prepare the PbTe high-performance thermoelectric material, which can be displayed as Ag1-XPb18+YSbTe20, wherein, the x is the amount of deviated Ag amount and y is amount that the raw material powder over the measurement rate of Pb. Compared to traditional powder metallurgy technology, the inventive MA+SPS process has the advantages of short process, high efficiency, lower energy consumption, and application to the industrial mass production and the attained thermoelectric material has better thermoelectric performance while the non-dimensional merit ZT of thermoelectric material of Ag1-XPb18+YSbTe20 prepared by MA and SPS can reach 1.37 in the temperature of 450 Deg. C.

Description

technical field [0001] The invention belongs to the technical field of new energy materials and their preparation, and in particular relates to an Ag-Pb-Sb-Te thermoelectric material which is a thermoelectric semiconductor compound with a high-temperature differential electric effect and a preparation method thereof. Background technique [0002] Thermoelectric materials, or thermoelectric materials, refer to a type of energy that converts heat and electricity based on two basic thermoelectric effects—the Seebeck effect and the Peltier effect. Material. Compared with traditional power generation technology, thermoelectric power generation devices made of thermoelectric materials have simple structure, strong durability, no moving parts, easy miniaturization, no maintenance, good reliability, long life, no noise, no pollution, and can be used Low-temperature waste heat and other characteristics; thermoelectric refrigeration devices made of thermoelectric materials, compared ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L35/16H01L35/34
Inventor 李敬锋王衡木太拓志
Owner TSINGHUA UNIV
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