Cu-Cr-S ternary thermoelectric material and preparation method thereof

Abstract

The invention discloses a Cu-Cr-S ternary thermoelectric material and a preparation method thereof, belonging to the technical field of energy material. Cu, Cr and S are collocated according to the stoichiometric ratio Cu Cr Sx, wherein the numeric area of x is more than or equal to 1.0 and less than or equal to 2.5. The Cu powder (mass percent more than or equal to 99.9%), Cr powder (mass percent more than or equal to 99.9%) and S powder (mass percent more than or equal to 99.5%) are taken as raw materials, compound powder can be synthesized by mechanical alloying, and then a block body can be sintered by discharge plasma. The invention has the technical characteristics that by adjusting the concentration of sulphur vacancy and optimizing the concentration of a current carrier, the conductivity and the Seebeck coefficient can be improved; and the nano-structure block body material prepared by combining the mechanical alloying and discharge plasma sintering is beneficial to reducing the thermal conductivity and obtaining a higher thermoelectricity optimum value. The preparation method has low price of raw materials, simple and convenient preparation process, easy operation, low requirement for equipment and preparation environment and short period, and is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of energy materials, in particular to a Cu-Cr-S ternary thermoelectric material and a preparation method thereof, involving mechanical alloying (Mechanical Alloying, MA) and spark plasma sintering (Spark Plasma Sintering, SPS) processes . Background technique [0002] CuCrS 2 It is a layered semiconductor material with unique magnetic and electrical properties. Most of the literature reports are about CuCrS 2 The magnetic properties, and its thermoelectric properties have begun to attract people's attention in recent years. The currently reported methods for the synthesis and preparation of Cu-Cr-S ternary thermoelectric materials mainly involve solid-state sintering. French researchers My.A.Boutbila et al [JournalAlloys and Compounds, 244 (1996) 23-26.] prepared the ternary sulfide CuCrS by solid phase sintering 2 , the sulfide undergoes a transformation from N-type semiconductor to P-type semiconducto...

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Problems solved by technology

This method has high sintering temperature, requires atmosphere protection, harsh reaction conditions, long preparation cycle and large energy consumptio

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