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
CN1916211AActive Publication Date: 2007-02-21中科西卡思(苏州)科技发展有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
中科西卡思(苏州)科技发展有限公司
Publication Date
2007-02-21

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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.
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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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