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Layered high-entropy MAX-phase ceramic thermoelectric material and preparation method thereof

A technology of thermoelectric materials and high entropy, which is applied in the direction of thermoelectric device junction lead-out materials, thermoelectric device manufacturing/processing, etc., can solve the problems of limitations, harsh thermoelectric properties of materials, single material system structure, etc., and achieve layered structure. control, high thermoelectric figure of merit, and flexible operation

Active Publication Date: 2020-09-29
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005]Since layered thermoelectric materials have a unique structure in which atomic layers are stacked in sequence, the layer spacing can be adjusted by means of interlayer stripping, atomic replacement, element doping or intercalation, etc. , interlayer force and component structure to regulate the physical properties of the original material system, so the existing material system structure is relatively simple
This also leads to a large degree of limitation in the performance of the prepared material system. At present, there is no mature and stable process that can effectively control the structure and uniformity distribution of layered high-entropy MAX phase ceramic thermoelectric materials. The application environment of the material puts forward more stringent requirements on the thermoelectric performance of the material

Method used

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  • Layered high-entropy MAX-phase ceramic thermoelectric material and preparation method thereof
  • Layered high-entropy MAX-phase ceramic thermoelectric material and preparation method thereof
  • Layered high-entropy MAX-phase ceramic thermoelectric material and preparation method thereof

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preparation example Construction

[0038] In another aspect of the present invention, the present invention proposes a method for preparing a layered high-entropy MAX phase ceramic thermoelectric material. According to an embodiment of the present invention, refer to image 3 , the preparation method comprises:

[0039] S100: preparing composite powder.

[0040] In this step, a composite powder is prepared, wherein the composite powder includes M elemental powder, A elemental powder and carbon powder, and the M elemental powder includes at least three elements of group IIIB, IVB, VB and VIB. Specifically, M can be scandium (Sc), titanium (Ti), vanadium (V), chromium (Cr), zirconium (Zr), niobium (Nb), molybdenum (Mo), hafnium (Hf) and tantalum (Ta) At least three elements in A, such as the combination of heavy elements of Cr, V, Ti, Nb and Ta, or the combination of heavy elements of Ti, Nb and Ta; A can be aluminum (Al), silicon (Si), germanium (Ge ), tin (Sn) and sulfur (S) elements at least one element, su...

Embodiment 1

[0053] In this example, a layered high-entropy MAX phase ceramic thermoelectric material was prepared. The specific steps are as follows:

[0054] (1) The M site uses Cr, V, Ti, Nb and Ta as raw materials, and the molar ratio is the same as 0.4, the A site raw material is Al and the X site raw material is C powder, and then according to n(M):n(A) :n(X)=2:1.05:1 ratio to design MAX material composite powder;

[0055] (2) Place the composite powder in a ball mill tank under an argon protective environment for ball milling, the ball milling time is 2 hours, the ball milling speed is 300rmp, after mixing evenly, the composite powder is taken out and sealed for later use;

[0056] (3) The composite powder after ball milling was placed in a SPS sintering furnace in a vacuum environment and reacted at 1300 °C for 5 minutes to obtain a layered high-entropy MAX phase ceramic thermoelectric material.

[0057] The layered high-entropy MAX phase ceramic thermoelectric material prepared ...

Embodiment 2

[0061] In this example, the layered high-entropy MAX phase ceramic thermoelectric material was prepared according to the same method and conditions as in Example 1. In this example, the differences are: (1) the M site uses Ti, Nb and Ta as raw materials, and the molar ratio is the same as 0.67; (2) the ball milling time is 3 hours, and the ball milling speed is 200rmp; (3) sintering at 1300°C React for 10 minutes.

[0062] The layered high-entropy MAX phase ceramic thermoelectric material prepared in this embodiment, its SEM photo reference figure 2 . Then, the ceramic thermoelectric material was made into a sample with a diameter of 16mm and a thickness of 2.93mm, and the thermal conductivity test was performed, and the thermal conductivity of the layered high-entropy MAX phase ceramic thermoelectric material at room temperature was 11.35W m -1 K -1 .

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Abstract

The invention provides a layered high-entropy MAX phase ceramic thermoelectric material and a preparation method thereof. A molecular formula of the layered high-entropy MAX phase ceramic thermoelectric material is Mn+1AXn, M is at least three elements selected from IIIB, IVB, VB and VIB group elements, A is at least one element selected from IIIA, IVA, VA and VIA group elements, X is a carbon element, and n is 1, 2 or 3. The layered high-entropy MAX phase ceramic thermoelectric material is advantaged in that an element ratio in the same position can be regulated and controlled according to actual requirements, the material has a hexagonal crystal system structure, the space group is P63 / mmc, a crystal cell is formed by alternately stacking Mn+1Xn units and A-layer atoms in the c direction, and the high-entropy alloy is formed through the design of the combination of more than three M elements so that the high-entropy MAX-phase ceramic thermoelectric material has very wide applicationprospects in the fields of manned spaceflight, national defense war industry, automobile manufacturing, micro-nano electronics and the like, particularly in the fields of thermoelectric power generation, thermoelectric refrigeration and the like.

Description

technical field [0001] The invention relates to the technical field of thermoelectric materials, in particular, the invention relates to a layered high-entropy MAX phase ceramic thermoelectric material and a preparation method thereof. Background technique [0002] The rapid development of modern science and technology has caused increasingly serious environmental problems and excessive consumption of traditional energy. In my country, 20-55% of industrial energy is lost in the form of waste heat every year, and this number is still increasing year by year. How to effectively use waste heat energy will be It is very important to the efficient utilization of energy and the sustainable development of the environment, and the research and development of corresponding new energy materials has attracted more and more attention. Among them, thermoelectric materials can directly realize the mutual conversion of heat energy and electric energy. This material has very broad applicatio...

Claims

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Application Information

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IPC IPC(8): H01L35/12H01L35/14H01L35/20H01L35/34
CPCH10N10/85H10N10/851H10N10/854H10N10/01
Inventor 刘超林元华南策文杨岳洋
Owner TSINGHUA UNIV
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