High-strength and high-efficiency bismuth telluride block and preparation method and application thereof

A bismuth telluride and bismuth telluride-based technology, applied in the manufacture/processing of thermoelectric devices, thermoelectric device junction lead-out materials, etc., can solve the problems of introducing harmful impurity ions, different crystal grains, and moisture absorption of powders, etc.

Pending Publication Date: 2021-08-31
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to achieve fast and low-cost preparation of high-strength bismuth telluride materials by using a slow zone melting process to prepare polycrystalline rods with preferred orientation
[0003] The traditional preparation idea based on mechanical ball milling to obtain grain refinement can reduce the lattice thermal conductivity of the material, but ball milling will introduce a large number of defects of different scales and lead to different orientations of the grains, which makes the carrier mobility of the material Significant drop, resulting in extremely low electrical conductivity, low power factor greatly limits the application of the material
In addition, the process of crystal rod cutting and ball milling into powder will also bring about many problems such as moisture absorption, oxidation and introduction of harmful impurity ions in the powder.
In addition, the ball mill running at high speed during the milling process will bring a lot of dust, and the large-scale production of the factory will cause environmental pollution, especially harmful to the health of operators

Method used

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  • High-strength and high-efficiency bismuth telluride block and preparation method and application thereof
  • High-strength and high-efficiency bismuth telluride block and preparation method and application thereof
  • High-strength and high-efficiency bismuth telluride block and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] Using 5N Bi, Te and Sb as raw materials, according to the stoichiometric ratio Bi 0.5 Sb 1.5 Te 3 Batching, put into the quartz crucible, the diameter of the quartz crucible is 20mm, vacuumize to less than 10pa and seal the quartz crucible with hydrogen oxygen flame. The quartz crucible is placed in an italic tube furnace, and the angle between the axial direction and the horizontal direction of the italic tube furnace is 30°. The temperature in the furnace is controlled at 750°C, fully smelted and synthesized, then cooled to room temperature to obtain bismuth telluride-based polycrystalline rods. Reseal the bismuth telluride-based polycrystalline rod into a double-layer quartz crucible with a small hole, the diameter of the small hole is 2 mm, the distance between the small hole and the bottom of the outer crucible is 80 cm, and the inner and outer crucibles are evacuated to 10pa. Fix the crucible to the figure 1 On the zone melting furnace, adjust the heating tem...

Embodiment 2

[0106] Using 5N Bi, Te and Se simple substances as raw materials, according to the stoichiometric ratio Bi 2 Te 2.8 Se 0.2 The ingredients are put into the quartz crucible, the diameter of the quartz crucible is 20mm, the vacuum is lowered to less than 10pa, and the quartz crucible is sealed with an oxyhydrogen flame. The ingot is completely melted at a temperature of 750° C., fully melted and synthesized, and then cooled to room temperature to obtain a bismuth telluride-based polycrystalline rod. Reseal the bismuth telluride-based polycrystalline rod into a double-layer quartz crucible with a small hole, the diameter of the small hole is 2 mm, the distance between the small hole and the bottom of the outer crucible is 80 cm, and the inner and outer crucibles are evacuated to less than 10pa. Fix the crucible to the figure 1 On the zone melting furnace, adjust the heating temperature of the zone furnace to 700°C, adjust the relative position between the zone furnace and the...

Embodiment 3

[0108] The difference from Example 1 is that during the fused deposition process, the metal support at the bottom of the outer crucible is actively cooled, and the temperature of the metal support is -150°C by externally connecting liquid nitrogen coolant. When the molten drop hits the bottom of the outer crucible After turning into a liquid film, the purpose of rapid cooling is achieved. The cooling rate is 250K / S. The ultra-low temperature deposition environment can effectively inhibit the growth of the grains of the molten droplets during the cooling process, and obtain directional deposition blocks with smaller grain sizes. , followed by vacuum hot-press sintering to obtain high-strength P-type bismuth telluride-based thermoelectric materials.

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Abstract

The invention discloses a high-strength and high-efficiency bismuth telluride block. The bismuth telluride block is in a lamellar shape; the bismuth telluride block is a P-type lamellar bismuth telluride block of Bi0.5Sb1.5Te3+x, and the value range of x is 0-0.05, or, the bismuth telluride block is an N-type lamellar bismuth telluride block of Bi2Te3-ySey, and y ranges from 0 to 0.3. The bismuth telluride block is of a special lamellar structure and has the double characteristics of high orientation degree and grain refinement, and the bismuth telluride block can be directly used for vacuum hot pressing sintering or vacuum thermal deformation sintering without being cut and / or ground into powder. And the bismuth telluride-based thermoelectric material with high thermoelectric figure of merit and high strength can be rapidly prepared.

Description

technical field [0001] The application relates to a high-strength and high-efficiency bismuth telluride block and its preparation method and application, belonging to the technical field of bismuth telluride-based thermoelectric materials. Background technique [0002] Traditional commercial high-strength bismuth telluride bulk materials mainly use bismuth telluride zone-fused polycrystalline rods with preferred orientation as the initial raw material, and then prepare powders with suitable particle sizes through cutting, crushing, high-energy ball milling and other processes. The bismuth telluride block is obtained by hot pressing and sintering. This polycrystalline bismuth telluride block prepared by powder technology can not only greatly improve the mechanical strength and processability of the material, but more importantly, it can greatly reduce the lattice thermal conductivity by refining the grains and introducing nanostructures. , improve the ZT figure of merit (the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L35/16H01L35/34
CPCH10N10/852H10N10/01
Inventor 胡皓阳蒋俊王泓翔罗国强肖昱琨熊成龙谈小建石樊帆
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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