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Sleeve forging and pressing preparation method of bismuth-telluride-base thermoelectric material

A thermoelectric material, bismuth telluride-based technology, applied in the field of new preparation of bismuth telluride-based thermoelectric materials, can solve the problems of long preparation process, complicated equipment, high energy consumption, etc., and achieve simple preparation process, simple equipment and low preparation cost low effect

Inactive Publication Date: 2012-07-04
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods still have the defects of complex equipment, long preparation process, low efficiency and high energy consumption.

Method used

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  • Sleeve forging and pressing preparation method of bismuth-telluride-base thermoelectric material
  • Sleeve forging and pressing preparation method of bismuth-telluride-base thermoelectric material
  • Sleeve forging and pressing preparation method of bismuth-telluride-base thermoelectric material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]Get 30g of commercial P-type bismuth telluride bars prepared by zone melting method (same as reference example 1), pulverize and grind into powder less than 200 meshes, and then put the powder into an aluminum casing with an outer diameter of Φ22mm and a wall thickness of 3mm. The tube is then placed in a cold die, and the powder is compacted into a block billet with a press, and then the excess aluminum sleeve that is higher than the sample is removed so that the aluminum sleeve is flush with the upper and lower edges of the sample. Then place the sample with the aluminum sleeve in a Φ26mm hot forging steel mold, place the sample together with the hot forging steel mold in an annular heating mantle on the operating table of the hydraulic press, heat the sample to 450°C, and heat-preserve and sinter for 20 minutes. No pressure is applied during the process, and argon gas is introduced into the mold to prevent the sample from being oxidized during the heat preservation and...

Embodiment 2

[0035] Take 30g of commercial N-type bismuth telluride bar material prepared by zone melting method (same as reference example 2), crush and grind it into 200 mesh powder as raw material, the following preparation method and parameters are the same as in Example 1. The ZT of the sample at 300K is 0.84, which is 20% higher than that of the sample of reference example 2.

Embodiment 3

[0037] Choose high-purity elemental bismuth, antimony, and tellurium, according to Bi 0.5 Sb 1.5 Te 3 Weigh the raw material, then melt it in a vacuum induction melting furnace by induction melting, cool down to obtain a bismuth telluride-based alloy (see reference example 3), and then pulverize and grind it into a powder of less than 200 meshes as a raw material. The following preparation method and parameters are the same as in Example 1. The ZT of the sample at 300K is 1.15, which is 67% higher than that of the sample of Reference Example 3.

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Abstract

The invention relates to a sleeve forging and pressing preparation method of a bismuth-telluride-base thermoelectric material, which comprises the following steps: (1) material preparation: smelting raw materials to obtain a bismuth telluride base block material, pulverizing, grinding and screening to obtain powder; (2) sleeve filling: filling the powder into an aluminum sleeve, putting the aluminum sleeve in a cold-press die, and compacting the powder with a pressing machine to obtain a block blank; (3) presintering: heating to 300-580 DEG C, and keeping the temperature for 3 minutes to 1 hour; (4) forging and pressing: forging the bismuth telluride base block alloy thermoelectric material with the aluminum sleeve under the forging and pressing pressure of 20-900MPa until the die cavity is fully filled, and maintaining or not maintaining the pressure; and (5) sleeve removal: removing the aluminum sleeve to obtain the required bismuth telluride base block thermoelectric material. The invention has the following advantages: 1) the required equipment is simple; 2) the preparation technique is simple and practical; 3) the technique of sheathing an aluminum sleeve outside the sample is adopted to effectively avoid sample cracking which can possibly occur in the forging process; and 4) the prepared sample has high thermoelectric properties and favorable actual effect.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and relates to a novel preparation method of a bismuth telluride-based thermoelectric material. Background technique [0002] Thermoelectric materials are functional materials that can convert heat and electricity. Devices made of them have the characteristics of no noise, no vibration, no wear, long operating life, less maintenance, high reliability, and no pollution. Bismuth telluride-based alloys are still the thermoelectric materials with the best performance near room temperature so far. They have been applied in optoelectronics, microelectronic devices, medical instruments, temperature control, etc. Most commercial electronic refrigeration components use this kind of material. Bismuth telluride-based alloys have a hexahedral layered structure, and their thermoelectric properties are strongly anisotropic, with the largest ZT value in the direction parallel to (001). Therefore, mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C29/00
Inventor 王忠蒋利军丁正朱磊简旭宇
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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