Multiple filling skutterudite thermoelectric material and preparation process thereof

Abstract

This invention relates to a multi filled skutterudite thermoelectric material. Its characteristic is filling of two or more than two metal atoms I in the hole of skutterudite AB3 crystal icosahedron, the ratio of I:A:B is y:4;:12. In the equation, A represents one or two of Fe, Co and Ni, B is one or two of S6, Se and Fe, I is two or more than two of K, Na, Ca, Sr, Ba, Yb, Ce, La or Ou, y is the sum padding whose volume is met to 0.05-1. The production process of the thermoelectric material includes feeding, melting and quenching, it has the characteristic such as simple processes, low cost and being suitable to produce.

Description

technical field [0001] The invention relates to a multi-filled skutterudite thermoelectric material and a preparation method thereof, belonging to the field of thermoelectric materials. Background technique [0002] Thermoelectric power generation technology is a technology that directly converts thermal energy into electrical energy. It has the characteristics of small size, high reliability, and long life. It plays an important role in technical fields such as space science, military equipment, and waste heat power generation. The key to the thermoelectric power generation system is the thermoelectric material, and its performance is usually expressed by the dimensionless performance index ZT (ZT=α 2 σT / κ, where α is the Seebeck coefficient; σ is the electrical conductivity; κ is the thermal conductivity, and T is the absolute temperature). The higher the ZT value, the better the performance of the material and the higher the efficiency of thermoelectric power generation....

AI Technical Summary

Problems solved by technology

However, the thermal conductivity of filled skutterudite materials is still high, and there is still a lot of room for decline

[0004] L.Chen et al synthesized (Ba, Sr) by solid state reaction method y co 4 Sb 12 , (Ba, Ce) y co 4 Sb 12 , (Ba, La) y co 4 Sb 12 Compound (20 th International Conference on Thermoelectrics, 57, 2001), although the thermal conductivity of the material is lower than that of single-filled compounds, the process of preparing multi-filled skutterudite by solid-state reaction method is very complicated, the crystallinity of the material is poor, and it is difficult to obtain high-filled skutterudite. The amount, the material contains impurities, so the performance of the material has not been improved

D.Berardan prepared Ce by arc melting method 1-y Yb y Fe 4 Sb 12 (Journal of Alloys and Compounds, 351, 18, 2003) and (Ce-Yb) y Fe 4-x (Co / Ni) 4 Sb 12 (Journal of Applied Physics, 98, 033710, 2005 and Materials Research Bulletin, 40, 537, 2005), the method needs to anneal the material obtained after multiple electric arc smelting at high temperature for a long time, the process is complex, the preparation period is long, and Difficult to obtain pure multi-filled skutterudite compounds

Q.M.Lu et al prepared Ce with fine grains by using the rapid sintering technology of Spark Plasma Sintering. m La n Fe 1.0 co 3.0 Sb 12 (Journal of AppliedPhysics, 98, 106107, 2005), this technology rapidly raises the temperature of the raw materials to a higher temperature and applies a certain pressure, triggers chemical reactions to obtain multi-filled skutterudite and sinters dense bulk materials at the same time, although the preparation method It is simple and fast, and can obtain a microstructure with fine grains, but the material has low crystallinity and contains more impurities, so its performance is low

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