THERMOELECTRIC CONVERSION MATERIAL, THERMOELECTRIC CONVERSION MODULE, AND METHOD FOR MANUFACTURING THERMOELECTRIC CONVERSION MATERIAL

Title:

THERMOELECTRIC CONVERSION MATERIAL, THERMOELECTRIC CONVERSION MODULE, AND METHOD FOR MANUFACTURING THERMOELECTRIC CONVERSION MATERIAL

Document Type and Number:

WIPO Patent Application WO/2019/139168

Kind Code:

A1

Abstract:

Provided are: a thermoelectric conversion material with a high dimensionless figure of merit ZT; a thermoelectric conversion module; and a method for manufacturing a thermoelectric conversion material. This thermoelectric conversion material (1) comprises: multiple polycrystalline particles (11) with a skutterudite crystal structure including Yb, Co, and Sb; and an inter-particle layer (12), which is present between adjacent polycrystalline particles (11) and comprises crystals (13) with an O to Yb atom ratio greater than 0.4 and less than 1.5. This method for manufacturing a thermoelectric conversion material includes: a weighing step (S1); a mixing step (S2); a ribbon-producing step (S3) for rapidly solidifying a melt of the raw material by rapid solidification to produce a ribbon; a first heat treatment step (S4) for heat-treating in an inert atmosphere in which the oxygen concentration has been adjusted; a second heat treatment step (S5) for heat-treating in a reducing atmosphere; and a pressure sintering step (S6) for pressure sintering in an inert atmosphere to manufacture the thermoelectric conversion material (1).

Inventors:

SHIMADA TAKESHI (JP)
WANG NAN (JP)
MATSUDA MICHIKO (JP)

Application Number:

PCT/JP2019/000945

Publication Date:

July 18, 2019

Filing Date:

January 15, 2019

Export Citation:

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Assignee:

HITACHI METALS LTD (JP)

International Classes:

H01L35/18; B22F1/00; B22F3/10; B22F9/04; C22C12/00; H01L35/22; H01L35/34; H02N11/00

Foreign References:

JP2016058558A	2016-04-21
JP2001135865A	2001-05-18
JP2013219095A	2013-10-24
JP2001185767A	2001-07-06
JP2013506312A	2013-02-21
JP2004076046A	2004-03-11

Other References:

J. YANG ET AL.: "Dual-frequency resonant phonon scattering in BaxRyCo4Sbl2 (R=La, Ce and Sr", APPLIED PHYSICS LETTERS, vol. 90, 2007, pages 192111
XUN SHI ET AL.: "Multiple-filled Skutterudites: High Thermoelectric Figure of Merit through Separately Optimizing Electrical and Thermal Transports", J. AM. CHEM. SOC., vol. 133, 2011, pages 7837 - 7846
SHANYU WANG ET AL.: "High-performance n-type YbxCo4Sbl2: from partially filled skutterudite towards composite thermoelectrics", NPG ASIA MATERIALS, vol. 8, 2016, pages l-11
See also references of EP 3742504A4