期刊
METALS
卷 11, 期 7, 页码 -出版社
MDPI
DOI: 10.3390/met11071060
关键词
Bi2Te3-based alloys; hot compression; thermoelectric properties; mechanical properties
资金
- Innovative Research Team Development Program of Ministry of Education of China [IRT_17R83]
- 111 Project [B17034]
- Wuhan Frontier Project on Applied Research Foundation [2019010701011405]
A new technique called CHCM was proposed for preparing Bi2Te3-based alloys, which showed improved material utilization and higher ZT value for thermoelectric devices. The method overcame the problem of easy cleavage and destruction in zone-melted Bi2Te3-based alloys.
This study proposes a constrained hot compression-molding (CHCM) technique for preparing Bi2Te3-based alloys. This method overcomes the problem of easy cleavage and destruction for the zone-melted Bi2Te3-based alloy, which is beneficial to improve the material utilization rate and thermoelectric devices yield in the commercial manufacturing process. The stress field distribution inside the CHCM specimen is explored via finite element analysis. The compressive strength of the CHCM sample is above 44 MPa, which is about 38% higher than that of the zone melting (ZM) material. Meanwhile, the CHCM sample shows a much lower electrical conductivity and thermal conductivity, but a higher Seebeck coefficient than that of the ZM sample, which is mainly due to the increase of the line defect concentration induced by the CHCM process. Finally, a maximum thermoelectric figure of merit (ZT) value of 0.6 was achieved for CHCM sample.
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