Magnesium-based thermoelectric conversion material, magnesium-based thermoelectric conversion element, thermoelectric conversion device, and method for manufacturing magnesium-based thermoelectric conversion material

Patent metadata

Field	Value
Publication number	US-11538974-B2
Application number	US-201716084057-A
Country	US
Kind code	B2
Filing date	Mar 17, 2017
Priority date	Mar 17, 2016
Publication date	Dec 27, 2022
Grant date	Dec 27, 2022

Abstract

A magnesium-based thermoelectric conversion material includes a first layer formed of Mg 2 Si and a second layer formed of Mg 2 Si x Sn 1-x (here, x is equal to or greater than 0 and less than 1), in which the first layer and the second layer are directly joined to each other, and within a junction surface with the first layer and in the vicinity of the junction surface, the second layer has a tin concentration transition region in which a tin concentration increases as a distance from the junction surface increases. The junction layer is regarded as a site in which a tin concentration is found to be equal to or lower than a detection limit by the measurement performed using EDX.

First claim

The invention claimed is:

1. A magnesium-based thermoelectric conversion element, comprising:
a magnesium-based thermoelectric conversion material; and
electrodes joined to one surface and the other surface, facing the one surface, of the magnesium-based thermoelectric conversion material,
wherein the magnesium-based thermoelectric conversion material includes:
a first layer formed of Mg 2 Si; and
a second layer formed of Mg 2 Si x Sn 1-x , wherein x is greater than 0 and less than 1,
wherein the first layer and the second layer are directly joined to each other,
within a junction surface with the first layer and in a range equal to or greater than 1 μm and equal to or smaller than 50 μm in a lamination direction from the junction surface, the second layer has a tin concentration transition region in which a tin concentration increases as a distance from the junction surface increases, and
a region in which the Sn concentration is 0.5% by mass to Y % by mass is regarded as the tin concentration transition region, and Y represents a value which equals 95% of a Sn concentration of the second layer.

2. A thermoelectric conversion device, comprising:
a plurality of the magnesium-based thermoelectric conversion elements according to claim 1 ,
wherein the magnesium-based thermoelectric conversion elements are arranged to be electrically connected to each other in series through the electrodes.

3. The magnesium-based thermoelectric conversion element according to claim 1 , wherein x is equal to or greater than 0.37 and less than 1.

Assignees

• Mitsubishi Materials Corp

Inventors

• Nakada Yoshinobu
• Arai Koya
• Komasaki Masahito

Classifications

• B22F3/10 Primary

  Sintering only · CPC title

• B22F2003/247

  Removing material: carving, cleaning, grinding, hobbing, honing, lapping, polishing, milling, shaving, skiving, turning the surface · CPC title

• B22F7/06

  of composite workpieces or articles from parts, e.g. to form tipped tools {(B22F7/002 takes precedence)} · CPC title

• B22F3/17

  by forging · CPC title

• B22F3/20

  by extruding · CPC title