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Filling in thermoelectric material of cobalt stibide based skutterudite by alkali-metal atom, and preparation method

A technology for filling cobalt antimonide-based and thermoelectric materials, which is applied in the direction of thermoelectric device node lead-out materials, etc., can solve the problems of difficult preparation, strong corrosion, etc., and achieve the effect of solving difficult preparation, low cost, and improved thermoelectric performance

Active Publication Date: 2007-02-21
中科西卡思(苏州)科技发展有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention applies the encapsulation technology of double-layer carbon-coated quartz tubes to the field of preparation of skutterudite-based thermoelectric materials, which not only solves the preparation difficulties caused by the high vapor pressure of alkali metal elements, but also solves its strong corrosiveness problem

Method used

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  • Filling in thermoelectric material of cobalt stibide based skutterudite by alkali-metal atom, and preparation method
  • Filling in thermoelectric material of cobalt stibide based skutterudite by alkali-metal atom, and preparation method
  • Filling in thermoelectric material of cobalt stibide based skutterudite by alkali-metal atom, and preparation method

Examples

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Embodiment 1

[0027] Example 1: Ky co 4 Sb 12 Material

[0028] The metal raw materials K, Co, and Sb were mixed according to the molar ratio of 0:4:12 and 0.5:4:12 respectively, and double-layer packaged into a vacuum carbon-coated quartz tube, and the packaged raw materials were melted together with the quartz ampoule at 1150 ° C for 30 minutes After quenching in air, the obtained ingot was ground into powder and then heat-treated at 800°C for 1 hour. X-ray diffraction analysis of the obtained powder showed that the synthesized material was pure phase K y co 4 Sb 12 For the skutterudite material, the resulting loading was 0.38. The X-ray diffraction pattern illustrates the obtained K 0.38 co 4 Sb 12 The material is well crystalline and of high purity (see figure 2 ). The obtained powder was sintered by SPS at 450° C. for 25 minutes with a pressure of 100 MPa. Thermal conductivity tests show that the lattice thermal conductivity of potassium-filled skutterudite materials is sign...

Embodiment 2

[0029] Example 2: Na y co 4 Sb 12 Material

[0030] The metal raw materials Na, Co, and Sb are dosed according to the molar ratio of 0:4:12 and 0.6:4:12, and double-packed into a carbon-coated quartz tube filled with a small amount of inert gas. After melting at low temperature for 30 hours, it was quenched in water. The obtained ingot was ground into powder and then heat-treated at 400°C for 100 hours. X-ray diffraction analysis of the obtained powder showed that the synthesized material was pure phase Na y co 4 Sb 12 The skutterudite material, resulting in a fill of 0.5. Na prepared by this method 0.5 co 4 Sb 12 and CoSb 3 Good crystallinity and high purity (see Figure 5 ). The obtained powder was sintered by SPS at 750° C. for 10 minutes with a pressure of 30 MPa. Thermal conductivity tests show that the lattice thermal conductivity of sodium-filled skutterudite materials is very low (see Image 6 ); by measuring the electrical conductivity and the Seebeck coe...

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Abstract

This invention relates to a method for preparing alkali-metal-filled cobalt-antimonide-based thermoelectric material having high filling amount and excellent thermoelectric property. The thermoelectric material has a general chemical formula of AyCo4Sb12, wherein y is within 0-1, and A is at least one of Li, Na, K and Rb. The method comprises: (1) preparing metal raw materials with purities higher than 99% according to a stoichiometric ratio of Ay+y'Co4Sb12, wherein y' is within 0-0.5y and y within 0-1; (2) mixing and filling into a carbon-coated quartz tube in vacuum or inert atmosphere; (3) heating to 950-1200 deg.C for melting, and reacting completely; (4) quenching in air or quenching liquid oil (oil or water) to obtain AyCo4Sb12 crystal rod; (5) grinding into powder, mixing uniformly and tableting; (6) performing thermal treatment in inert atmosphere, grinding into powder, placing into a graphite mold, and rapidly sintering by plasma-discharging sintering to obtain compact block. The method has such advantages as simple process and low cost, and the obtained alkali-metal-filled cobalt-antimonide-based thermoelectric material has excellent thermoelectric properties.

Description

technical field [0001] A cobalt antimonide-based skutterudite material filled with alkali metal atoms with high filling amount and excellent thermoelectric performance and a preparation method thereof belong to the field of thermoelectric materials. technical background [0002] Thermoelectric power generation technology is a technology that uses the Seebeck effect of semiconductor materials to directly convert heat energy into electrical energy. It has the advantages of no transmission parts, high reliability, long life, and environmental friendliness. It is used in waste heat power generation, space science, military equipment, household appliances, etc. Many fields play an important role. Its conversion efficiency mainly depends on the dimensionless thermoelectric performance performance index ZT of the material itself (ZT=S 2 σT / κ, where S is the Seebeck coefficient; σ is the electrical conductivity; κ is the thermal conductivity, and T is the absolute temperature). Th...

Claims

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Application Information

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IPC IPC(8): C22C12/00C22C1/04H01L35/18
Inventor 陈立东裴艳中柏胜强赵雪盈
Owner 中科西卡思(苏州)科技发展有限公司
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