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Cubic-phase Ca2Si thermoelectric material and preparation method thereof

A technology of thermoelectric materials and cubic phase, which is applied in the field of cubic phase Ca2Si thermoelectric materials and its preparation, can solve the problems that thermoelectric materials have not been reported, and achieve the effects of easy operation, low reaction temperature and high density

Inactive Publication Date: 2016-11-16
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, with respect to the cubic Ca 2 Si thermoelectric materials are still almost unreported

Method used

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  • Cubic-phase Ca2Si thermoelectric material and preparation method thereof
  • Cubic-phase Ca2Si thermoelectric material and preparation method thereof
  • Cubic-phase Ca2Si thermoelectric material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A cubic phase Ca 2 The preparation method of Si thermoelectric material, comprises the following steps:

[0027] (1) Mix Ca powder and Si powder at a molar ratio of 2.0:1 under an Ar protective atmosphere to obtain a mixture;

[0028] (2) Put the mixture obtained in step (1), grinding balls, stainless steel ball milling tank and electronic balance into a glove box filled with an atmospheric pressure Ar, in which the mass ratio of balls to materials is 3:1, and accurately weigh in the glove box Finally, put into the ball mill jar, seal the ball mill jar well, avoid oxygen from entering, then take out the ball mill jar from the glove box;

[0029] (3) Put the ball mill pot prepared in step (2) into the ball mill for 5 h at a speed of 2000 rpm to fully react the powder;

[0030] (4) Take out the reacted powder in step (3), put it into a stainless steel mold with an inner hole diameter of 10 mm, use vacuum plasma sintering, heat up to 300 °C under a pressure of 300 MPa an...

Embodiment 2

[0033] A cubic phase Ca 2 The preparation method of Si thermoelectric material, comprises the following steps:

[0034] (1) Mix Ca powder and Si powder at a molar ratio of 2.3:1 under an Ar protective atmosphere to obtain a mixture;

[0035] (2) Put the mixture obtained in step (1), the grinding balls, the stainless steel ball milling tank and the electronic balance into a glove box filled with an atmospheric pressure Ar, wherein the mass ratio of the ball to material is 16:1, and accurately weigh in the glove box After measuring, put into the ball mill jar, seal the ball mill jar well to prevent oxygen from entering, and then take out the ball mill jar from the glove box;

[0036] (3) Put the ball mill pot prepared in step (2) into the ball mill for 100 h at a speed of 500 rpm to fully react the powder;

[0037] (4) Take out the reacted powder in step (3), put it into a stainless steel mold with a hollow size of 12 mm×6 mm, use vacuum plasma sintering, and heat up to 500 °C...

Embodiment 3

[0040] A cubic phase Ca 2 The preparation method of Si thermoelectric material, comprises the following steps:

[0041] (1) Mix Ca powder and Si powder at a molar ratio of 2.5:1 under an Ar protective atmosphere to obtain a mixture;

[0042](2) Put the mixture, grinding balls, stainless steel ball milling tank and electronic balance into a glove box filled with an atmospheric pressure Ar, wherein the mass ratio of balls to materials is 8:1. After accurate weighing in the glove box, put Put into the ball mill jar, seal the ball mill jar well to prevent oxygen from entering, then take out the ball mill jar from the glove box;

[0043] (3) Put the stainless steel vacuum ball mill tank prepared in step (2) into a ball mill for 50 h at a speed of 2000 rpm to fully react the powder;

[0044] (4) Take out the reacted powder in step (3), put it into a hollow 10 mm×10 mm stainless steel mold, adopt vacuum plasma sintering method, heat up to 100 °C under a pressure of 600 MPa and keep...

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Abstract

The invention discloses a cubic-phase Ca2Si thermoelectric material and a preparation method thereof. The method comprises the following steps that 1, Ca powder and Si power are mixed to be uniform in an Ar protective atmosphere, and a mixture is obtained; 2, the mixture, a grinding ball, a stainless steel ball grinding tank and electronic scales are put into a glove box inflated with an atmosphere of Ar, after accurate weighing is conducted in the glove box, the mixture is put into the ball grinding tank, the ball grinding tank is well sealed, oxygen is prevented from entering the ball grinding tank, and then the ball grinding tank is taken out of the glove box; 3, the well-prepared ball grinding tank in the second step is put into a ball grinder, ball grinding is conducted at a certain rotating speed, and the powder reacts completely; 4, the well reacted powder in the third step is taken out and put into a stainless steel mold with a required specification, vacuum-sintering tabletting is conducted by means of a vacuum plasma sintering mode, and the cubic-phase Ca2Si flake or blocky thermoelectric material is obtained. The cubic-phase Ca2Si thermoelectric material and the preparation method thereof have the advantages that the technology is simple, operation is easy, the cost is low, and the obtained cubic-phase Ca2Si flake or blocky material is high in product purity and close in integration and has a good industrialization prospect.

Description

technical field [0001] The invention relates to the field of thermoelectric functional materials, in particular to a cubic phase Ca 2 Si thermoelectric material and its preparation method. Background technique [0002] Thermoelectric materials are green and environmentally friendly functional materials that can directly convert heat energy and electric energy; thermoelectric devices made of thermoelectric materials have small size, light weight, no mechanical rotating parts, no noise, long service life, It has the advantages of polluting the environment, and can be widely used in fields such as thermoelectric generators, thermoelectric coolers, and sensors. High-performance thermoelectric materials are one of the hot topics in the current international materials research field. The performance of thermoelectric materials is mainly characterized by the dimensionless quality factor ZT value: ZT=Tσα 2 / κ, where T is the absolute temperature, σ is the electrical conductivity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58
CPCC04B35/58085C04B2235/401C04B2235/428C04B2235/6581
Inventor 温翠莲裘依梅萨百晟熊锐林逵洪云
Owner FUZHOU UNIV
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