Method for preparing silver antimony tellurium and silver telluride based on-site composite thermoelectric material

A technology of in-situ compounding and thermoelectric materials, applied in the manufacture/processing of thermoelectric devices, etc., can solve the problems of increased cost and long time, and achieve the effects of short heating time, low cost and reduced thermal conductivity

Inactive Publication Date: 2010-07-21
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods take a long time and increase the cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Ag by stoichiometric ratio 0.86 Sb 1.14 Te 2.14 Calculate and weigh silver, antimony and tellurium elements, place them in a vacuum quartz tube, heat and fully melt them in a furnace at 1000°C, keep warm for 1000 minutes, then cool to 900°C at a cooling rate of 1°C / min, and immediately put the quartz tube Put it into liquid nitrogen for quenching to obtain the casting material, and then mechanically ball mill the material, then vacuum hot press at 350°C and 70MPa for 0.5h. Get Ag-Sb-Te / Ag 2 Te-based in-situ composite thermoelectric materials.

[0016] Adopt RigakuD / MAX-2550PC type X-ray polycrystal diffractometer (XRD) to carry out phase analysis to the sample that this example makes, obtain sample is AgSbTe 2 Phase and Ag 2 Composites of Te phase, Ag 2 The proportion of Te phase is about 1.5%.

[0017] According to the thermal diffusivity measured by the Netzsch LFA-457 laser pulse thermal analyzer, the specific heat measured by the Netzsch DSC-404 differential ...

Embodiment 2

[0019] Ag by stoichiometric ratio 0.88 Sb 1.12 Te 2.12 Calculate and weigh silver, antimony and tellurium elements, seal them into vacuum quartz tubes, heat and fully melt them in a furnace at 1100°C, keep them warm for 800 minutes, then cool them down to 900°C at a cooling rate of 1°C / min, and immediately put the quartz tubes Put it into liquid nitrogen for quenching to obtain the casting material, and then mechanically ball mill the material, then vacuum hot press at 350° C. and 70 MPa for 1 hour. Microstructure observation, the sample is basically AgSbTe 2 Single phase, with Ag distributed on grain boundaries 2 Te second phase. Ag by XRD and energy spectrum analysis 2 The composition ratio of Te is basically about 3%. The performance test shows that the thermal conductivity of the composite thermoelectric material is κ=0.72W·m at room temperature -1 K -1 , α=189.9μVK -1 , ZT value is 1.00 at 600K.

Embodiment 3

[0021] Ag by stoichiometric ratio 0.90 Sb 1.10 Te 2.10 Calculate and weigh silver, antimony and tellurium elements, seal them into vacuum quartz tubes, heat and fully melt them in a furnace at 1050°C, keep them warm for 600 minutes, then cool them down to 900°C at a cooling rate of 1°C / min, quickly put the quartz tubes into Quenching was carried out in liquid nitrogen to obtain the cast material, and then the material was mechanically ball-milled, and vacuum hot-pressed at 300° C. and 75 MPa for 1 hour. Microstructure observation, the sample is single-phase AgSbTe 2 The precipitated Ag is evenly distributed on the grain boundaries of 2 Te second phase, Ag by XRD and energy spectrum analysis 2 The proportion of Te in the obtained material is 8%. The performance test shows that the thermal conductivity of the composite thermoelectric material is κ=0.87W·m at room temperature -1 K -1 , α=290.6μVK -1 , ZT value is 1.12 at 600K.

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Abstract

The invention discloses a method for preparing silver antimony tellurium and silver telluride based on-site composite thermoelectric material, including the steps: weighing silver, antimony and tellurium according to the formula: Agx Sb2-xTe3-x, wherein x being 086 to 0.95, enveloping the same in a vacuum quartz tube, heating to 1000 to 1100 DEG C for fully fusing, keeping for 600 to 1000 minutes, cooling at the speed of 1 DEG C per minute to 900 DEG C, placing the quartz tube into the liquid nitrogen for quenching, obtaining the castingsolid material, ball milling and crushing, obtaining theblock thermoelectric alloy. The invention has simple process, lower cost, short period and adaptability for mass productuion, the prepared block silver antimony tellurium and silver telluride based on-site composite thermoelectric material has lower thermal conductivity and higher Seebeck coefficient, thus obtaining higher room-temperature thermoelectricalmerit.

Description

technical field [0001] The invention relates to a preparation method of silver antimony tellurium and silver telluride based in-situ composite thermoelectric material. The invention belongs to the technical field of thermoelectric semiconductor materials. Background technique [0002] A thermoelectric material is a semiconductor material that directly converts electrical energy and thermal energy through the movement of carriers (electrons or holes). Thermoelectric materials have two related effects in the energy conversion process, one is the Seebeck effect, that is, when there is a temperature difference between the two ends of the thermoelectric material, the thermoelectric material can convert heat energy into electrical energy output, so thermoelectric power generation devices can be used as deep space spacecraft , field operations, marine lighthouses, power sources used by nomadic people, or for industrial waste heat, waste heat power generation; another effect is cal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C21D1/18C22C32/00H01L35/34
Inventor 赵新兵张胜楠朱铁军杨胜辉
Owner ZHEJIANG UNIV
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