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A kind of bi-sb-te-se-s five-element high-entropy alloy and preparation method thereof

A bi-sb-te-se-s, high-entropy alloy technology, which is applied in the manufacture/processing of thermoelectric devices, junction lead-out materials of thermoelectric devices, etc., can solve the problems of long preparation cycle and high cost of thermoelectric materials, and achieve The effect of shortening the preparation cycle, short reaction time and improving efficiency

Active Publication Date: 2022-08-05
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a Bi-Sb-Te-Se-S five-element high-entropy alloy and a preparation method thereof to solve the existing commonly used Bi 2 Te 3 The problem of long preparation period and high cost of thermoelectric materials

Method used

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  • A kind of bi-sb-te-se-s five-element high-entropy alloy and preparation method thereof
  • A kind of bi-sb-te-se-s five-element high-entropy alloy and preparation method thereof

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Embodiment 1

[0033] A Bi-Sb-Te-Se-S five-element high-entropy alloy, the chemical formula of the high-entropy alloy is Bi 1.5 Sb 0.5 TeSeS, the high-entropy alloy is a p-type thermoelectric material, and the high-entropy alloy has a single-phase structure.

[0034] The preparation method of the high-entropy alloy comprises the following steps:

[0035] Step 1: The starting materials are powdered Bi, powdered Sb, powdered Te, powdered Se and powdered S with a purity greater than 99.99 wt%, and according to the general chemical formula, Bi is 1.5 Sb 0.5 The stoichiometric ratio of TeSeS was weighed, placed in a planetary ball mill, and evacuated to 1×10 -1 -5×10 -4 Pa, and then protected by argon-hydrogen mixture, the ratio of argon-hydrogen mixture was 95:5; the rotational speed of the planetary ball mill was set to 800rpm / min, lasted for 100min, and the powdery mixture was obtained by ball milling.

[0036] Step 2: sieve the powder mixture obtained in step 1 with a sieve mesh of 200 m...

Embodiment 2～5

[0038] The preparation methods of Examples 2 to 5 are the same as those of Example 1, except that the process parameters shown in Table 1 are different.

[0039] Table 1 is the technological parameter of embodiment 2~5

[0040] Example 1 Example 2 Example 3 Example 4 Example 5 Ball mill speed (rpm / min) 800 600 400 200 100 Ball milling time (min) 100 130 180 240 300 Sintering temperature (℃) 400 500 300 200 200 Sintering time (min) 10 5 15 20 20 Sintering pressure (MPa) 30 20 25 50 45

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Abstract

The invention relates to the technical field of thermoelectric materials, and specifically discloses a Bi-Sb-Te-Se-S five-element high-entropy alloy and a preparation method thereof. The high-entropy alloy is a p-type thermoelectric material, and the preparation method is to obtain elemental Bi and Sb. , Te, Se and S, according to the general chemical formula Bi 1.5 Sb 0.5 The stoichiometric ratio of TeSeS was weighed and ball-milled to a powdery mixture; the powdered mixture was sintered by spark plasma to obtain Bi 1.5 Sb 0.5 TeSeS bulk high-entropy alloy, wherein the sintering temperature is 200-500° C., the sintering time is 5-20 min, and the sintering pressure is 20-50 MPa. Using this technical scheme to prepare Bi 1.5 Sb 0.5 The TeSeS thermoelectric material, while shortening the preparation cycle of the thermoelectric material, uses cheap Se powder and S powder to replace some of the more expensive Te sources, and obtains better thermoelectric performance.

Description

technical field [0001] The invention relates to the technical field of thermoelectric materials, in particular to a Bi-Sb-Te-Se-S five-element high-entropy alloy and a preparation method thereof. Background technique [0002] Functional materials and their applications have become a hot field of research and discussion in various industries today. Thermoelectric materials, as a branch of functional materials, have developed rapidly in recent years and have made corresponding breakthroughs in practical applications. Thermoelectric materials (also known as thermoelectric materials) can form an efficient conversion between thermal energy and electrical energy through the transport and interaction of charge carriers and phonons inside the solid. In terms of temperature difference generated by electricity, it is mainly used in the refrigeration of electronic components and daily small-scale refrigeration; in terms of heat generation by temperature difference, it can be used in po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L35/16H01L35/34
CPCH10N10/852H10N10/01
Inventor 葛振华朱钰可冯晶
Owner KUNMING UNIV OF SCI & TECH