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Rapid non-equilibrium preparation method of Mg-Si-Sn-Sb-based thermoelectric material

A technology of mg-si-sn-sb and thermoelectric materials, which is applied in the field of rapid non-equilibrium preparation, can solve the problems of incomplete reaction, inconsistent composition and nominal ratio, and complicated preparation process, so as to shorten the material preparation cycle and avoid crystallization. The effect of excessive grain growth and simplified process

Inactive Publication Date: 2021-01-29
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the disadvantage is that the preparation process is complicated, the cycle is long, the energy consumption is high, and the grains of the block after final sintering are relatively coarse and the thermal conductivity is high.
In addition to these common problems, the above-mentioned preparation process also has some disadvantages that are difficult to solve by itself.
For example, the melting method is difficult to solve the problems such as the high-temperature volatilization and dissipation of Mg caused by the high melting point difference between Mg and Si, and the easy oxidation of Mg at high temperature or the reaction with the container; B 2 o 3 The actual composition of Mg-Si-Sn-Sb-based materials prepared by liquid sealing method is often inconsistent with the nominal ratio, the reason is that Mg and B 2 o 3 Oxidation-reduction reactions will occur; when Mg-Si-Sn-Sb-based materials are prepared by mechanical alloying, Mg is very easy to adhere to the surface of the ball and the inner wall of the ball mill, resulting in agglomeration of the powder and incomplete reaction

Method used

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  • Rapid non-equilibrium preparation method of Mg-Si-Sn-Sb-based thermoelectric material

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Effect test

Embodiment 1

[0036] A kind of rapid non-equilibrium preparation method about Mg-Si-Sn-Sb base thermoelectric material, it comprises the following steps:

[0037] (1) In a glove box filled with argon, press Mg 2.16 (Si 0.3 sn 0.7 ) 0.98 Sb 0.02 The stoichiometric ratio of each element in the method weighs Mg powder (2N, 100200 mesh), Mg 2 Si powder (2.5N, 200 mesh), Si powder (3N, 400 mesh), Sn powder (2.5N, 200 mesh) and Sb powder (5N, 200 mesh) are used as raw materials, and then the powder is mixed in an agate mortar , Mg 2 The ratio of the amount of Si powder to Si powder is 1:4; then put the powder into a high-strength graphite mold with an inner diameter of 15mm, first hold the pressure at 6MPa for 5min, and then hold at 8MPa for 10min ;

[0038] (2) Sintering: Put the graphite mold filled with raw materials in the discharge plasma sintering system, and perform vacuuming operation on the sintering cavity to ensure that the vacuum degree is ≤5Pa, and the vacuuming time is not le...

Embodiment 2

[0043] A kind of rapid non-equilibrium preparation method about Mg-Si-Sn-Sb base thermoelectric material, it comprises the following steps:

[0044] (1) In a glove box filled with argon, press Mg 2.16 (Si 0.3 sn 0.7 ) 0.98 Sb 0.02 The stoichiometric ratio of each element in the method weighs Mg powder (2N, 100200 mesh), Mg 2 Si powder (2.5N, 200 mesh), Si powder (3N, 400 mesh), Sn powder (2.5N, 200 mesh) and Sb powder (5N, 200 mesh) are used as raw materials, and then the powder is mixed in an agate mortar , Mg 2 The ratio of the amount of Si powder to Si powder is 1:1; then put the powder into a high-strength graphite mold with an inner diameter of 15mm, first hold the pressure at 6MPa for 5min, and then hold at 8MPa for 10min ;

[0045] (2) Sintering: Put the graphite mold filled with raw materials in the discharge plasma sintering system, and perform vacuuming operation on the sintering cavity to ensure that the vacuum degree is ≤5Pa, and the vacuuming time is not le...

Embodiment 3

[0050] A kind of rapid non-equilibrium preparation method about Mg-Si-Sn-Sb base thermoelectric material, it comprises the following steps:

[0051] (1) In a glove box filled with argon, press Mg 2.16 (Si 0.3 sn 0.7 ) 0.98 Sb 0.02 The stoichiometric ratio of each element in the method weighs Mg powder (2N, 100200 mesh), Mg 2 Si powder (2.5N, 200 mesh), Si powder (3N, 400 mesh), Sn powder (2.5N, 200 mesh) and Sb powder (5N, 200 mesh) are used as raw materials, and then the powder is mixed in an agate mortar , Mg 2 The ratio of the amount of Si powder to Si powder is 1:1; then put the powder into a high-strength graphite mold with an inner diameter of 15mm, first hold the pressure at 6MPa for 5min, and then hold at 8MPa for 10min ;

[0052] (2) Sintering: Put the graphite mold filled with raw materials in the discharge plasma sintering system, and perform vacuuming operation on the sintering cavity to ensure that the vacuum degree is ≤5Pa, and the vacuuming time is not le...

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Abstract

The invention relates to a rapid non-equilibrium preparation method of an Mg-Si-Sn-Sb-based thermoelectric material, which comprises the following steps: (1) proportioning and pre-pressing molding: weighing Mg powder, Si powder, Mg2Si powder, Sn powder, Sb powder and other raw materials in a glove box according to the chemical formula Mg<2><(1 + z)> Si<1-x>Sn<x>Sb<y>, uniformly mixing, filling into a graphite mold, and pre-pressing into a blank; (2) sintering: putting the graphite mold filled with the raw materials into a spark plasma sintering system, vacuumizing, applying 10MPa pre-pressure,then heating the sample to 903K, quickly adjusting the pressure to 30MPa, keeping the temperature for 5min, and cooling along with the furnace; and (3) taking out the sample, cutting and polishing toobtain the high-performance Mg-Si-Sn-Sb-based bulk thermoelectric material. The preparation method has the characteristics of simple preparation process, low energy consumption, short preparation period, good repeatability, peculiar microstructure of the obtained material, excellent thermoelectric performance and the like.

Description

technical field [0001] The invention belongs to the field of new energy materials, and in particular relates to a rapid non-equilibrium preparation method for Mg-Si-Sn-Sb-based thermoelectric materials. Background technique [0002] In recent years, with the gradual reduction of fossil fuel reserves such as coal, oil, and natural gas, and the increasing emphasis on environmental protection around the world, new energy technologies represented by photovoltaic power generation, wind power generation, tidal power generation, etc. organization's attention. Thermoelectric materials are a typical new energy material. Its main applications are divided into two fields: power generation and refrigeration, which utilize the Seebeck effect and the Peltier effect respectively. At present, common thermoelectric materials are mainly inorganic semiconductors. Unlike traditional air conditioners or internal combustion engines, their energy conversion mainly depends on the movement of carri...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/622C04B35/626C04B35/64
CPCC04B35/58085C04B35/622C04B35/64C04B35/62605C04B2235/666C04B2235/401C04B2235/428C04B2235/3891
Inventor 尹康贺显聪朱睿健
Owner NANJING INST OF TECH