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Composite thermoelectric material crystal ingot and preparation method and application thereof

A technology for thermoelectric materials and crystal ingots, applied in the field of material engineering, can solve problems such as segregation of impurity elements that have not yet been solved, and achieve the effects of reasonable microstructure, good composition uniformity and high utilization rate

Pending Publication Date: 2021-12-07
XIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In response to this problem, although a vertical zone smelting method has been proposed, this method mainly solves the problem of gas-liquid equilibrium in the preparation process, and has not yet solved the problem of segregation of impurity elements.

Method used

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  • Composite thermoelectric material crystal ingot and preparation method and application thereof
  • Composite thermoelectric material crystal ingot and preparation method and application thereof
  • Composite thermoelectric material crystal ingot and preparation method and application thereof

Examples

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Effect test

preparation example Construction

[0043] An embodiment of the present invention provides a method for preparing the above-mentioned composite thermoelectric material crystal ingot, comprising:

[0044] Will Cu 2 Te and Bi 2 Te 3 Placed in the melting temperature zone of the heating device to make Bi 2 Te 3 melts and makes Cu 2 Te dissolves in Bi 2 Te 3 in the melt;

[0045] Then the dissolved Cu 2 Bi of Te 2 Te 3 The melt moves from the melting temperature zone to the solidification temperature zone of the heating device to solidify the melt into an ingot.

[0046] The above method makes the melt solidify in the direction opposite to the heat flow (that is, the direction from the solidification temperature zone to the melting temperature zone) as the solidification direction, located at Bi 2 Te 3 The copper-rich phase between (Cu) sheets is formed during the solidification process. The copper in the liquid phase mainly diffuses in a short distance perpendicular to the growth direction, and the diff...

Embodiment 1

[0063] This example uses Cu 2 Te and intrinsic Bi 2 Te 3 A crystal ingot of composite thermoelectric material is prepared as a raw material.

[0064] First weigh the raw materials so that Cu 2 Te and Bi 2 Te 3 The molar ratio of 6:994, namely Cu 2 The molar content of Te is 0.6%; the raw material is packed into a quartz ampoule and vacuumed to 2.5×10 -4 Pa sealed;

[0065] Then put the quartz ampoule containing the raw materials into the upper furnace of the tube furnace with two temperature zones, and heat to make Bi 2 Te 3 melts and makes Cu 2 Te dissolves in Bi 2 Te 3 In the melt; the temperature of the upper furnace of the tube furnace is 680°C, the temperature of the lower furnace of the tube furnace is 500°C, and the length of the temperature transition zone between the upper furnace and the lower furnace of the tube furnace is 100mm.

[0066] Then let the quartz ampoule drop into the lower furnace of the two-temperature-zone tube furnace at a speed of 50mm / h...

Embodiment 2

[0069] This example uses Cu 2 Te and commercial n-type Bi 2 Te 3 Preparation of composite thermoelectric materials as raw materials.

[0070] First weigh the raw materials so that Cu 2 Te and commercial n-type Bi 2 Te 3 The molar ratio of 6:94, namely Cu 2 The molar content of Te is 6%; the raw material is loaded into a quartz ampoule and vacuumed to 2.8×10 -4 Pa sealed;

[0071] Then put the quartz ampoule containing the raw materials into the upper furnace of the tube furnace with two temperature zones, and heat to make Bi 2 Te 3 melts and makes Cu 2 Te dissolves in Bi 2 Te 3 In the melt; the temperature of the upper furnace of the tube furnace is 650°C, the temperature of the lower furnace of the tube furnace is 350°C, and the length of the temperature transition zone between the upper furnace and the lower furnace of the tube furnace is 200mm.

[0072] Then let the quartz ampoule drop into the lower furnace of the tube furnace with two temperature zones at a sp...

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Abstract

The invention discloses a composite thermoelectric material crystal ingot and a preparation method and application thereof, and relates to the technical field of material engineering. The composite thermoelectric material crystal ingot is formed by alternately overlapping Bi2Te3(Cu) and a copper-rich phase, the Bi2Te3(Cu) is a solid solution formed by dissolving Cu in Bi2Te3, and the Bi2Te3(Cu) is in a sheet shape and is arranged in parallel. The preparation method of the composite thermoelectric material crystal ingot comprises the following steps: placing Cu2Te and Bi2Te3 in a melting temperature zone of a heating device so that Cu2Te and Bi2Te3 are melted and mutually dissolved; and then moving to a solidification temperature zone to solidify the melt into crystal ingots. The composite thermoelectric material crystal ingot is good in component uniformity and good in performance uniformity. According to the preparation method, the component uniformity of the crystal ingot in the solidification direction is good, the performance is uniform, the utilization rate is high, large-size crystal ingots can be conveniently prepared, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of material engineering, in particular to a crystal ingot of a composite thermoelectric material and a preparation method and application thereof. Background technique [0002] Properly doped bismuth telluride has excellent thermoelectric properties near room temperature, and has been widely used in semiconductor refrigeration devices. The zone smelting method and the directional solidification method are two commonly used methods to prepare bismuth telluride materials. The essence of the two methods is to gradually solidify from one end to the other. Due to the influence of segregation, the impurity elements in the solidified ingot are along The distribution of solidification direction is not uniform, which affects the performance of the ingot. In actual production, in order to ensure the consistency of material performance, the head and tail of the ingot have to be removed, and sometimes the amount of rem...

Claims

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Application Information

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IPC IPC(8): H01L35/12H01L35/14H01L35/16H01L35/18H01L35/34
CPCH10N10/85H10N10/851H10N10/852H10N10/853H10N10/01Y02B30/00
Inventor 廖榆文金应荣贺毅张勤勇陈巧杜辉欧冰赵根杨宏玉
Owner XIHUA UNIV
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