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High-performance P-type alpha-MgAgSb-based thermoelectric material and preparation method thereof

A thermoelectric material and high-performance technology, applied in the direction of thermoelectric device junction lead-out material, thermoelectric device manufacturing/processing, etc., can solve the problems of high energy ball milling expensive, complicated sealing conditions, high impurity content, low cost, Highly reproducible, easy-to-use effects

Active Publication Date: 2018-11-06
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a high-performance p-type α-MgAgSb-based thermoelectric material and its preparation method. The selected material is relatively cheap, the preparation method is simple, green and environmentally friendly, and the pure-phase p-type α- MgZnAgSb thermoelectric material, the material has high repeatability, good thermal stability and mechanical strength. At 473K, the thermal conductivity of the material is 0.757W / (m*k), which is the lowest value of the system at present, and ZT is 1.5, which is At present, the maximum value of the system solves the problems of volatilization of Mg element, complicated sealing conditions, high impurity content and high price of high-energy ball milling in traditional high-temperature smelting and two-step high-energy ball milling.

Method used

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  • High-performance P-type alpha-MgAgSb-based thermoelectric material and preparation method thereof
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  • High-performance P-type alpha-MgAgSb-based thermoelectric material and preparation method thereof

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Embodiment 1

[0030] Metal powder Mg, Ag, Sb according to Mg 1-x Zn x The stoichiometric ratio of AgSb (x=0) is 1:1:1. Weigh it in a glove box filled with argon (the molar content of argon is 99.999%), and put it into a stainless steel ball mill tank. The ball-to-material ratio is 20:1.

[0031] The ball mill is installed symmetrically on the stainless steel ball mill, and then ball milled for 24 hours under the protection of argon to obtain a powder with a particle size of 100-500nm at a speed of 600r / min. , stop for 10 minutes.

[0032] The ball-milled powder was subjected to spark plasma sintering under the conditions of temperature 400°C, pressure 60Mpa, and heat preservation for 30min.

[0033] X-ray diffractometer (D8-ADVANCEX, Hitachi, Japan) was used to conduct phase analysis on the sample of this embodiment, and it was confirmed that it was an α-MgAgSb thermoelectric material with a tetragonal structure. The thermal diffusivity measured by the Netzsch LFA 467 laser pulse therma...

Embodiment 2

[0036] Weigh the metal powders Mg, Ag and Sb in a glove box filled with argon gas according to the ratio of Mg1-xZnxAgSb (x=0) stoichiometric ratio of 1:1:1, and put them into a stainless steel ball mill tank. The ratio is 20:1.

[0037] The ball mill is installed symmetrically on the stainless steel ball mill, and then ball milled for 3 hours under the protection of argon to obtain a powder with a particle size of 500nm ~ 1μm. The rotating speed is 300r / min. The ball milling method is 60 minutes of forward rotation, 10 minutes of stop, and 60 minutes of reverse rotation. , stop for 10 minutes.

[0038] The ball-milled powder was subjected to spark plasma sintering under the conditions of a temperature of 200°C, a pressure of 10Mpa, and a heat preservation of 5 minutes.

[0039] The thermal diffusivity D=0.76mm of the sample that present embodiment makes at 473K 2 / s, thermal conductivity K=1.4W / mk, power factor PF=1080μW / m / K 2 , thermoelectric figure of merit ZT = 0.4.

Embodiment 3

[0041] Metal powder Mg, Ag, Sb according to Mg 1-x Zn x AgSb (x=0) with a stoichiometric ratio of 1:1:1 was weighed in a glove box filled with argon, and put into a stainless steel ball mill tank with a ball-to-material ratio of 20:1.

[0042] Install the ball mill tank symmetrically on the stainless steel ball mill, and then ball mill for 6 hours under the protection of argon to obtain a powder with a particle size of 100nm to 500nm at a speed of 400r / min. 60min, stop for 10min.

[0043] The ball-milled powder was subjected to spark plasma sintering under the conditions of temperature 350°C, pressure 60Mpa, and heat preservation for 5min.

[0044] The sample XRD pattern that present embodiment makes is as figure 1 As shown in (a), its thermal diffusivity D=0.71mm at 473K 2 / s, thermal conductivity K=1.31W / mk, power factor PF=990μW / m / K 2 , thermoelectric figure of merit ZT = 0.4.

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Abstract

The invention discloses a high-performance P-type alpha-MgAgSb-based thermoelectric material and a preparation method thereof. The raw material of the thermoelectric material comprises Mg1-xZnxAgSb, the selected material is relatively cheap, the preparation method is simple, environmental-protection, and can be used for large-scale and rapid preparation of pure-phase p-type alpha-MgZnAgSb thermoelectric material, as the material has high repeatability, good thermal stability and mechanical strength, At 473K, the thermal conductivity of the material is 0.757 W / (m*k), which is the lowest value of the system at present, and ZT is 1.5, which is the maximum value of the system at present. The problem of volatilization of Mg element in traditional high temperature smelting and two-step high energy ball milling is solved, and the sealing condition is complicated, the impurity content is high, and the high energy ball milling is expensive.

Description

Technical field: [0001] The invention relates to the technical field of semiconductor thermoelectric power generation and refrigeration near room temperature, in particular to a high-performance P-type α-MgAgSb-based thermoelectric material and a preparation method thereof. Background technique: [0002] Thermoelectric materials are a class of functional materials that can directly convert low-quality thermal energy into high-quality electrical energy (Seebeck effect), or directly generate cooling and heating effects from electrical energy (Peltier effect). The material has the advantages of reliable performance, no noise, no wear, easy miniaturization, and flexible movement. It can be used in high-tech fields such as deep space exploration, military affairs, and information, and is expected to be used in industry and daily life on a large scale. Commercial small semiconductor refrigeration refrigerators, water dispensers and waste heat recovery from oil and gas wells, etc. ...

Claims

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Application Information

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IPC IPC(8): H01L35/16H01L35/34
CPCH10N10/852H10N10/01
Inventor 苗蕾郑岩岩刘呈燕高杰陈俊良王潇漾
Owner GUILIN UNIV OF ELECTRONIC TECH