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 long time and cost increase, and achieve the effects of low cost, short heating time and energy saving

Inactive Publication Date: 2009-09-16
ZHEJIANG UNIV
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Problems solved by technology

These methods take a long

Method used

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Example Embodiment

[0014] Example 1

[0015] According to chemical dose ratio Ag 0.86 Sb 1.14 Te 2.14 Calculate and weigh the silver, antimony and tellurium elements, place them in a vacuum quartz tube, heat it in a 1000℃ furnace to fully melt, keep it for 1000 minutes, and then cool down to 900℃ at a rate of 1℃ / min, and immediately turn the quartz tube It is quenched in liquid nitrogen to obtain the casting material, and then the material is mechanically ball milled, and vacuum hot-pressed at 350°C and 70MPa for 0.5h. Get Ag-Sb-Te / Ag 2 Te-based in-situ composite thermoelectric material.

[0016] Phase analysis of the sample prepared in this example was carried out using RigakuD / MAX-2550PC X-ray polycrystalline diffractometer (XRD), and the sample was obtained as AgSbTe 2 Phase and Ag 2 Te phase composite material, Ag 2 The proportion of Te phase is about 1.5%.

[0017] The thermal conductivity κ is calculated based on the thermal diffusivity measured by the Netzsch LFA-457 laser pulse thermal analy...

Example Embodiment

[0018] Example 2

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

Example Embodiment

[0020] Example 3

[0021] According to chemical dose ratio Ag 0.90 Sb 1.10 Te 2.10 Calculate and weigh the silver, antimony and tellurium elements, seal them in a vacuum quartz tube, heat it in a 1050℃ furnace to fully melt, keep it for 600 minutes, and then cool to 900℃ at a rate of 1℃ / min, then quickly put the quartz tube in Quench in liquid nitrogen to obtain the casting material, and then mechanically ball mill the material, and then vacuum hot press at 300°C and 75MPa for 1h. Microstructure observation, the sample is single-phase AgSbTe 2 The precipitated Ag is evenly distributed on the grain boundaries of 2 Te second phase, XRD and energy spectrum analysis get Ag 2 The proportion of Te in the materials 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 the block 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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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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