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An ultrafast and low-cost method for preparing high-performance half-heusler bulk thermoelectric materials

A thermoelectric material and high-performance technology, which can be applied in the direction of thermoelectric device junction lead-out material, etc., can solve the problems of cumbersome and complicated reaction process, consume more energy, and require extremely high equipment, and achieve simple process, fast preparation process, and low equipment requirements. Effect

Active Publication Date: 2016-05-11
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the synthesis of Half-Heusler thermoelectric materials mainly adopts high-temperature and long-term solid-state reaction, suspension smelting combined with spark plasma sintering, arc smelting combined with hot-pressing sintering, etc., but due to the cumbersome and complicated reaction process, it needs to consume more energy and reduce the cost of equipment. extremely demanding

Method used

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  • An ultrafast and low-cost method for preparing high-performance half-heusler bulk thermoelectric materials
  • An ultrafast and low-cost method for preparing high-performance half-heusler bulk thermoelectric materials
  • An ultrafast and low-cost method for preparing high-performance half-heusler bulk thermoelectric materials

Examples

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Effect test

Embodiment 1

[0032] A method for preparing high-performance ZrNiSn bulk thermoelectric materials at ultra-fast and low cost, comprising the following steps:

[0033] 1) According to the stoichiometric ratio of 1:1:1, weigh Zr powder (2.5N), Ni powder (2.5N) and Sn powder (2.8N) as raw materials, the total amount is 5g, mix them evenly in an agate mortar, The obtained mixed powder is used as a reactant, and the reactant is put into a steel grinding tool, and a pressure of 6 MPa is used on a tablet press for 5 minutes to obtain a Φ12mm ingot;

[0034] 2) Vacuum-seal the ingot in the quartz glass tube, then move the bottom end of the glass tube to the gas flame to ignite, remove the flame immediately after the ignition reaction, the SHS process is completed within 2s, and then cool naturally;

[0035] 3) Grind the ZrNiSn compound obtained in step 2) into powder, weigh 4.6g of the powder and put it into a Φ15mm graphite mold for compaction, then put the graphite mold into the plasma activation...

Embodiment 2

[0038] A method for preparing high-performance TiCoSb powder thermoelectric material at ultra-fast and low cost, comprising the following steps:

[0039] 1) According to the stoichiometric ratio of 1:1:1, weigh Ti powder (4N), Co powder (3N) and Sb powder (5N) as raw materials, the total amount is 5g, and mix them evenly in an agate mortar to obtain The mixed powder is used as the reactant, and the reactant is put into a steel grinding tool, and the pressure of 6 MPa is used on the tablet press and the pressure is maintained for 5 minutes to obtain a Φ12mm ingot;

[0040] 2) Thermal detonation synthesis: The reactants were vacuum-sealed in a quartz glass tube, and then the quartz glass tube was quickly placed in a constant temperature furnace at 1083°C, taken out after 1 min, and cooled naturally to obtain a single-phase TiCoSb compound.

[0041] The above product was subjected to phase composition analysis. image 3 It is the XRD pattern of the product in step 2). It can be se...

Embodiment 3

[0043] An ultra-fast and low-cost preparation of high-performance Ti 0.5 Zr 0.5 The method for NiSn solid solution, it comprises the following steps:

[0044] 1) Use Ti powder (4N), Zr powder (2.5N), Ni powder (2.5N) and Sn powder (2.8N) as raw materials, that is, Ti powder and Zr powder are A powder, Ni powder is B powder, and Sn powder For X powder, weigh Ti powder (4N), Zr powder (2.5N), Ni powder (2.5N) and Sn powder (2.8N) according to the stoichiometric ratio of 1:1:2:2. The total amount is 5g. Mix evenly in an agate mortar, and use the obtained mixed powder as a reactant, put the reactant into a steel abrasive tool, use a pressure of 6 MPa on a tablet press and keep the pressure for 5 minutes to obtain a Φ12mm ingot;

[0045] 2) Self-propagating high-temperature synthesis: The reactant is vacuum-sealed in a quartz glass tube, and then the bottom of the glass tube is moved to a gas flame for ignition. After the reaction is ignited, the flame is removed immediately. The...

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Abstract

The invention provides a method for preparing high-performance Half-Heusler block thermoelectric materials at ultrahigh speed and low cost. The method particularly includes the steps that firstly, according to the general formula ABX of Half-Heusler compounds, powder A, powder B and powder X are weighed at the chemical stoichiometric ratio of 1:1:1, used as raw materials and uniformly mixed, and then an reactant is acquired; secondly, the reactant generates a combustion synthesis reaction, and cooling or quenching is conducted after the reaction is finished; thirdly, a product acquired through the second step is ground into fine powder, then PAS is conducted, and then the high-performance Half-Heusler block thermoelectric materials are acquired. According to the method, by the combination of the combustion synthesis reaction with the PAS process, the high-performance Half-Heusler block thermoelectric materials can be prepared within 15 min, and the method has the advantages that preparation time is short, energy consumption is low, the process is simple, the requirement for equipment is low, repeatability is good, and the method is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of new energy material preparation-combustion synthesis, and specifically relates to a method for preparing high-performance Half-Heusler block thermoelectric materials at ultra-fast and low cost. Background technique [0002] In the past ten years, with the rapid population expansion and rapid industrial development, energy and environmental issues have gradually become prominent, and the energy crisis and environmental crisis have attracted increasing attention. At present, about 70% of the energy consumed in the world every year is wasted in the form of waste heat. If the waste heat can be effectively recycled, the problem of energy shortage will be greatly alleviated. Thermoelectric materials can directly convert thermal energy into electrical energy. They have the advantages of no transmission parts, small size, no noise, no pollution, and good reliability. They have great application prospects in the r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/23H01L35/14
Inventor 唐新峰杨东旺瑞泽·万汪丽芳苏贤礼鄢永高
Owner WUHAN UNIV OF TECH
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