Top > Search of International Patents > THERMOELECTRIC MATERIAL, METHOD FOR PRODUCING SAME AND THERMOELECTRIC POWER GENERATION MODULE USING SAME

THERMOELECTRIC MATERIAL, METHOD FOR PRODUCING SAME AND THERMOELECTRIC POWER GENERATION MODULE USING SAME UPDATE_EN meetings

Foreign code F190009823
Posted date Jun 18, 2019
Country WIPO
International application number 2018JP032031
International publication number WO 2019044931
Date of international filing Aug 29, 2018
Date of international publication Mar 7, 2019
Priority data
  • P2017-166286 (Aug 31, 2017) JP
  • P2017-213401 (Nov 6, 2017) JP
Title THERMOELECTRIC MATERIAL, METHOD FOR PRODUCING SAME AND THERMOELECTRIC POWER GENERATION MODULE USING SAME UPDATE_EN meetings
Abstract The present invention provides: a thermoelectric material which is mainly composed of an Al-Fe-Si system intermetallic compound and exhibits thermoelectric effects over the temperature range from room temperature to 600°C, and which can be p-type or n-type by means of composition control; a method for producing this thermoelectric material; and a thermoelectric power generation module. A thermoelectric material according to the present invention comprises, as the main phase, a phase which contains at least Al, Fe and Si and is expressed as Al2Fe3Si3, while being represented by general formula Al12+p-qFe38.5+3qSi49.5-p-2q (wherein p satisfies 0 ≤ p ≤ 16.5, and q satisfies -0.34 ≤ q ≤ 0.34).
Outline of related art and contending technology BACKGROUND ART
Especially in the world in which the field energy even in Japan, about 3/4 of the primary supply energy is discarded as heat energy and the current situation, the exhaust heat recovery to establish technology deters their widespread use and has been desired. Under such a situation, the thermoelectric generation module, and to recover heat energy can be converted directly into electrical energy are attracting attention as a solid.
Recently, such a thermoelectric power module employed as a thermoelectric material, a low-cost and harmless is composed of only the elements, Al-Fe-Si intermetallic compound of ternary system has been proposed (for example, see Non-Patent Document 1). Here, the thermoelectric material is, in general, thermal and electrical energy is converted into a solid material has a characteristic to each other and, heating, and the generation of the temperature gradient in the cooling device, the generation of electrical energy from the waste heat of the material to be used for. Then, using such a material, can be converted to heat and power elements are formed. That is, 2 different types of such materials (for example, metal or semiconductor) junction, give rise to the temperature difference between the both ends of the electromotive force is generated, this is referred to as the Seebeck effect. On the other hand, different kinds of such a material 2 (for example, metal or semiconductor) junction current flows, heat is transferred to the other one is made of metal, which is referred to as the Peltier effect. Therefore, the thermoelectric material is, as to have such a function, unlike a simple material, thermoelectric material 1 as one of said accounts in the art. According to Non-Patent Document 1, is Al2Fe3Si3, using first-principles calculation based on the theoretical prediction, the carrier concentration of the p-type and n-type to adjust the thermoelectric characteristics of the reports can be controlled. However, p-type and n-type thermoelectric characteristics of the thermoelectric material exhibits a specific composition is not yet in the determination of the range.
On the other hand, with respect to the stoichiometric composition of Al2Fe3Si3 and 6at % Al by the composition of a rich, single-phase synthesis of Al2Fe3Si3 is reported as successful (for example, see Non-Patent Document 2). Is Al2Fe3Si3, Al-Fe-Si ternary system according to the state, in relatively wide range are known to exist, the non-patent document 2, Al26Fe37Si37 and Al2Fe3Si3 by the composition of the single-phase synthesis was successful. Non-Patent Document 2 is, Al26Fe37Si37 is obtained indicating the thermoelectric characteristics of the p-type are reported, further improvements in properties and practical use, n-type thermoelectric material can also be obtained.
Is equal to or less than 200°C occupies the majority of the heat is not be used, such a so-called poor heat can be recovered in a suitable, low-cost and harmless element is composed of only the desirable to develop a thermoelectric material.
Scope of claims (In Japanese)[請求項1]
 少なくとも、AlとFeとSiとを含有する金属間化合物を含有し、
 前記金属間化合物は、一般式Al 12+p-qFe 38.5+3qSi 49.5-p-2q(ここで、pは0≦p≦16.5を、qは-0.34≦q≦0.34を満たす)で表され、前記金属間化合物は、Al 2Fe 3Si 3で表される相を主相とする、熱電材料。

[請求項2]
 前記pは、0≦p<10を満たし、室温から600℃以下の温度範囲においてn型を示す、請求項1に記載の熱電材料。

[請求項3]
 前記pは、8≦p≦9を満たし、室温から600℃以下の温度範囲においてn型を示す、請求項2に記載の熱電材料。

[請求項4]
 前記pは、10≦p≦16.5を満たし、室温から600℃以下の温度範囲においてp型を示す、請求項1に記載の熱電材料。

[請求項5]
 前記pは、11≦p≦12を満たし、室温から600℃以下の温度範囲においてp型を示す、請求項4に記載の熱電材料。

[請求項6]
 前記金属間化合物は、前記Al 2Fe 3Si 3で表される相を70重量%以上含有する、請求項1~5のいずれかに記載の熱電材料。

[請求項7]
 前記金属間化合物は、ε-FeSiで表される相をさらに含有する、請求項1~6のいずれかに記載の熱電材料。

[請求項8]
 前記金属間化合物は、ε-FeSiで表される相を0.5重量%以上10重量%未満の範囲で含有する、請求項7に記載の熱電材料。

[請求項9]
 熱電材料を製造する方法であって、
 Alを含有する原料、Feを含有する原料、および、Siを含有する原料を、一般式Al 23.5+xFe 36.5+ySi 40-x-y(ここで、xおよびyは、それぞれ、-7.25<x<12および-0.5≦y≦1.5を満たす)を満たすように混合するステップと、
 前記混合するステップで得られた混合物を溶解し、反応させるステップと、
 を包含する、方法。

[請求項10]
 前記混合するステップにおいて、前記xは、-7.25<x<3を満たす、請求項9に記載の方法。

[請求項11]
 前記混合するステップにおいて、前記xは、1.5≦x≦2.5を満たす、請求項10に記載の方法。

[請求項12]
 前記混合するステップにおいて、前記xは、3≦x<12を満たす、請求項9に記載の方法。

[請求項13]
 前記混合するステップにおいて、前記xは、3.5≦x≦4を満たす、請求項12に記載の方法。

[請求項14]
 前記溶解し、反応させるステップは、前記混合物を、不活性雰囲気中、1500℃以上2200℃以下の温度範囲で加熱する、請求項9~13のいずれかに記載の方法。

[請求項15]
 前記溶解し、反応させるステップにより得られた反応物を焼結するステップをさらに包含する、請求項9~14のいずれかに記載の方法。

[請求項16]
 前記焼結するステップは、前記反応物を粉砕し、パルス通電焼結する、請求項15に記載の方法。

[請求項17]
 前記焼結するステップは、10MPa以上200MPa以下の圧力範囲で、800℃以上1000℃以下の温度範囲で焼結する、請求項15または16のいずれかに記載の方法。

[請求項18]
 前記焼結するステップで得られた焼結体を成型するステップをさらに包含する、請求項15~17のいずれかに記載の方法。

[請求項19]
 交互に直列に接続されたn型熱電材料およびp型熱電材料を備える熱電発電モジュールであって、前記n型熱電材料およびp型熱電材料の少なくとも一方は、請求項1~8のいずれかに記載の熱電材料である、熱電発電モジュール。

[請求項20]
 前記n型熱電材料は、請求項2または3のいずれかに記載の熱電材料であり、
 前記p型熱電材料は、請求項4または5のいずれかに記載の熱電材料である、請求項19に記載の熱電発電モジュール。

  • Applicant
  • ※All designated countries except for US in the data before July 2012
  • NATIONAL INSTITUTE FOR MATERIALS SCIENCE
  • Inventor
  • TAKAGIWA, Yoshiki
IPC(International Patent Classification)
Reference ( R and D project ) Thermoelectric Materials Group,Center for Green Research on Energy and Environmental Materials
Please contact us by E-mail or facsimile if you have any interests on this patent.

PAGE TOP

close
close
close
close
close
close