Mechanical Compatibility between Mg3(Sb,Bi)2 and MgAgSb in Thermoelectric Modules

被引:2
|
作者
Sun, Yifan [4 ]
Fu, Jiahui [1 ]
Ohishi, Yuji [1 ]
Toh, Keita [2 ]
Suekuni, Koichiro [2 ]
Kihou, Kunihiro [3 ]
Anazawa, Ushin [3 ]
Lee, Chul-Ho [3 ]
Kurosaki, Ken [4 ]
机构
[1] Osaka Univ, Grad Sch Engn, Suita, Osaka 5650871, Japan
[2] Kyushu Univ, Interdisciplinary Grad Sch Engn Sci, Dept Appl Sci Elect & Mat, Kasuga, Fukuoka 8168580, Japan
[3] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058568, Japan
[4] Kyoto Univ, Inst Integrated Radiat & Nucl Sci, Osaka 5900494, Japan
基金
日本科学技术振兴机构;
关键词
thermoelectric; Mg3Sb2; MgAgSb; mechanical properties; thermal expansion; stability; GLOBAL WASTE HEAT; THERMOMECHANICAL PROPERTIES; THERMAL-CONDUCTIVITY; EFFICIENCY; PERFORMANCE; STABILITY; RESOURCE;
D O I
10.1021/acsami.3c02544
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Thermoelectric (TE) modules are exposed to temperature gradients and repeated thermal cycles during their operation; therefore, mechanically robust n-and p-type legs are required to ensure their structural integrity. The difference in the coefficients of thermal expansion (CTEs) of the two legs of a TE module can cause stress buildup and the deterioration of performance with frequent thermal cycles. Recently, n-type Mg3Sb2 and p-type MgAgSb have become two promising components of low-temperature TE modules because of to their high TE performance, nontoxicity, and abundance. However, the CTEs of n-Mg3Sb2 and p-MgAgSb differ by approximately 10%. Furthermore, the oxidation resistances of these materials at increased temperatures are unclear. This work manipulates the thermal expansion of Mg3Sb2 by alloying it with Mg3Bi2. The addition of Bi to Mg3Sb2 reduces the coefficient of linear thermal expansion from 22.6 x 10-6to 21.2 x 10-6 K-1 for Mg3Sb1.5Bi0.5, which is in excellent agreement with that of MgAgSb (21 x 10-6 K-1). Furthermore, thermogravimetric data indicate that both Mg3Sb1.5Bi0.5 and MgAgSb are stable in air and Ar at temperatures below similar to 570 K. The results suggest the compatibility and robustness of Mg3Sb1.5Bi0.5 and MgAgSb as a pair of thermoelectric legs for low-temperature TE modules.
引用
收藏
页码:23246 / 23254
页数:9
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