Co-Sb series skutterudite compound thermoelectric material preparation method

A thermoelectric material and skutterudite technology, which is applied in the preparation field of Co-Sb series skutterudite compound thermoelectric materials, can solve the problem of high energy consumption, difficulty in obtaining single-phase skutterudite and filled skutterudite compound materials, cost higher question

Inactive Publication Date: 2003-06-11
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

Chinese Science Series B: Chemistry, 2000, 43 (3): 306-312): The current main problems of this solid-phase reaction preparation method are: 1) The material preparation time is too long, and the existing solid-phase reaction insulation time is at least over 18 hours
2) It is difficult to obtain single-phase skutterudite and filled skutterudite compound materials, and there are often Sb, CoSb in the reaction products 2 compounds or other impurities
Therefore, the preparation time of the material is long, the energy consumption is large, and the cost is high.

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Embodiment Construction

[0010] The method of the invention includes two material processing processes of prealloying and isothermal annealing. Firstly, through the mechanical alloying treatment of the original constituent materials, the constituent elements are uniformly mixed, and part of the skutterudite and filled skutterudite compounds are generated, while the structure of the material is refined, the diffusion distance between heterogeneous atoms is shortened, and the mixing system is improved. Gibbs free energy; then the material after the mechanical pre-alloying treatment is subjected to isothermal annealing treatment, and then a solid-phase reaction occurs to form a single-phase skutterudite compound.

[0011] For CoSb 3 Compound, the raw material is Co, Sb elemental powder, according to the atomic ratio Co: Sb = 1:3 for stoichiometric proportioning, the prepared mixed powder is first subjected to pre-mechanical alloying treatment, mechanical alloying treatment is a high-energy ball milling p...

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Abstract

There is a manufacturing method of Co-Sb serial cobalt compound thermoelectricity materials, the steps is: óƒ mechanism alloy process: the materials atomic proportion is Co:Sb=1:3, then the material powder is blended with grinding ball to carry on high energy ball grinding process, the weight proportion of ball material is 10:1í½20:1, the rotate speed is 180í½350 revolution / minute, the time is 8í½11 hours under protective gas. ó equal temperature quenching process: the material is equal temperature quenching processed under the protection vacuum or inert gases, the temperature is: 923í½1023K, the time is :1-3 hours. The invention uses two segment processing method, then the material is quenching processed and gets the CoSb3 compound with a short time.

Description

technical field [0001] The invention belongs to the technical field of material processing and preparation, and in particular relates to a method for preparing a Co-Sb series skutterudite compound thermoelectric material. Background technique [0002] At present, filled skutterudite compound (Filled Skutterudite) is a new type of material with excellent thermoelectric properties that has attracted extensive attention. It is named for its origin in the small town of Skutterud in Norway. The chemical formula of skutterudite compound can be written as XY 3 , each unit cell contains 8 XY 3 molecular. The X atoms can be Co, Ir, Fe, Rh and other metal elements, and the Y atoms can be P, As, Sb and other VA group elements. Among them, CoSb 3 The pores in the crystal lattice are the largest. By filling the lattice pores with large-scale rare earth or other metal atoms, the vibration effect of filling atoms in the pores can greatly reduce the lattice thermal conductivity of the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C12/00
Inventor 杨君友陈跃华彭江英朱文苏景芳宋新莉陈柔刚张同俊
Owner HUAZHONG UNIV OF SCI & TECH
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