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bi1-xsbx thermoelectric material and preparation method thereof

A technology of thermoelectric materials and powder materials, which is applied in the field of Bi1-xSbx thermoelectric materials and their preparation, can solve the problems of limited improvement of thermoelectric material performance, difficult to control product composition, and inability to be widely used, so as to reduce lattice thermal conductivity. , easy to operate, the effect of increasing the density

Inactive Publication Date: 2019-06-28
HENAN UNIV OF URBAN CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The combination of melt quenching and diffusion annealing can promote the uniform distribution of alloying elements, but the synthesis energy consumption is large, the time is long, and the cost is high
Spark plasma sintering technology (SPS) has a short reaction time and requires a lower temperature, but the product composition is difficult to control
Metal electrodeposition is easier to control the composition and morphology of the product, but the process route is more complicated and the yield is lower
The products synthesized by solvothermal method can reach the nanometer level, but they are easily mixed with organic impurities and cannot be observed in situ
In recent years, with the continuous development of nanomaterials and nanotechnology, it has become an important research direction to control the structure at the nanoscale, thereby improving the thermoelectric properties of materials. Researchers have tried new molding processes including hot pressing molding, hot extrusion molding , plasma activated sintering molding and channel angle extrusion, etc., but the performance improvement of thermoelectric materials is limited and cannot be widely used

Method used

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  • bi1-xsbx thermoelectric material and preparation method thereof
  • bi1-xsbx thermoelectric material and preparation method thereof
  • bi1-xsbx thermoelectric material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] This embodiment prepares Bi 1-x Sb x The method for thermoelectric materials includes the following steps:

[0030] 1) Weigh 0.65mol of raw material Bi and 0.35mol of raw material Sb respectively; put them into an agate ball mill jar, carry out mechanical alloying in a high-energy ball mill, add 50ml of absolute ethanol as a dispersant, use nitrogen protection during ball milling, and the ball-to-material ratio is 10:1, the stirring speed was 300r / min, and the grinding time was 100h; the ground material was vacuum-dried to obtain Bi 0.65 Sb 0.35 powder material;

[0031] 2) Take the Bi obtained in step 1) 0.65 Sb 0.35 Put the powder material into the mold, put it into the magnetic field for orientation, the magnetic field strength is 1800KA / m, the mold vibrates slightly during the orientation process, and the orientation time is 0.5h;

[0032] 3) Put the mold after the orientation operation in step 2) into a vacuum hot press, evacuate to -0.1MPa, and then pressuri...

Embodiment 2

[0035] This embodiment prepares Bi 1-x Sb x The method for thermoelectric materials includes the following steps:

[0036] 1) Put Bi 0.75 Sb 0.25 Put the powder material into the mold, put it into the magnetic field for orientation, the magnetic field strength is 2100KA / m, the mold vibrates slightly during the orientation process, and the orientation time is 0.6 h;

[0037] 2) Put the mold into a vacuum hot press, evacuate to -0.1MPa, and then pressurize and heat for sintering. The sintering temperature is 280 °C, the pressure is 50 MPa; the holding time is 150 s; a disc sample is made, with a diameter of 10mm and a thickness of 2 mm, that is.

[0038] Bi of this embodiment 1-x Sb x The thermoelectric material is Bi obtained directly according to the above method 1-x Sb x thermoelectric materials.

Embodiment 3

[0040] This embodiment prepares Bi 1-x Sb x The method for thermoelectric materials includes the following steps:

[0041] 1) Weigh 0.85mol of raw material Bi and 0.15mol of raw material Sb respectively; put them into an agate ball mill jar, carry out mechanical alloying in a high-energy ball mill, add 100ml of absolute ethanol as a dispersant, and use argon protection during ball milling. 15:1, the stirring speed was 500r / min, the grinding time was 120 h; then vacuum-dried to obtain Bi 0.85 Sb 0.15 powder material;

[0042] 2) put Bi 0.85 Sb 0.15 Put the powder material into the mold, put it into the magnetic field for orientation, the magnetic field strength is 2000KA / m, the mold vibrates slightly during the orientation process, and the orientation time is 1.0 h;

[0043] 3) Put the mold into a vacuum hot press, evacuate to -0.1MPa, and then pressurize and heat for sintering. The sintering temperature is 270 ℃, the pressure is 60 MPa; the holding time is 240 s; the waf...

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Abstract

The present invention relates to a Bi 1‑x Sb x A thermoelectric material and a preparation method thereof belong to the technical field of thermoelectric material preparation. The preparation method of the present invention comprises the following steps: 1) Bi 1‑x Sb x The powder material is oriented in the magnetic field, and the orientation time is 0.5~1 h; the value range of x is 0.05≤x≤0.35; 2) the Bi after orientation 1‑x Sb x The powder material is vacuum hot-pressed; the hot-pressing temperature is 260-280°C, and the hot-pressing time is 120-300s. This method can increase the Bi by orientation field orientation 1‑x Sb x The arrangement and orientation of the powder material can weaken the electron scattering effect on the migration, and improve the thermoelectric performance of the thermoelectric material. Its thermal conductivity is 250~360W / (cm K), and the thermoelectric figure of merit ZT is 0.1~0.13. Wide application has good economic benefits.

Description

technical field [0001] The present invention relates to a Bi 1-x Sb x A thermoelectric material and a preparation method thereof belong to the technical field of thermoelectric material preparation. Background technique [0002] Under the action of the potential difference between the two ends of the thermoelectric material, the directional migration of the carriers can generate a temperature difference and realize the mutual conversion between electric energy and thermal energy. It is a new type of green energy material. Thermoelectric devices using electric temperature difference for refrigeration have the advantages of small size, no mechanical transmission, low power consumption, no noise, no pollution, no maintenance, no moving parts and circulating working fluid during operation, and can be made into any size and shape. , Applicable to various energy occasions. At present, electric temperature difference devices have a wide range of applications in high-tech, milita...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04C22C12/00
CPCC22C1/007C22C12/00B22F2998/10C22C1/047B22F2009/041B22F2202/05B22F2003/145
Inventor 苏箐李山鹰刘向云陈湘李银峰李辉张艳花丁明洁赵海鹏
Owner HENAN UNIV OF URBAN CONSTR
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