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Substantial enhancement of mechanical properties for SnSe based composites with potassium titanate whiskers

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Abstract

Highly dense p-type polycrystalline SnSe dispersed with x vol% K2Ti6O13 whiskers (x = 0, 1, 3, 5) were fabricated by a high-pressure sintering (HPS) method. The effects of the K2Ti6O13 whiskers additives on the thermoelectric as well as mechanical properties of the composites were characterized in detail. The electrical conductivity, Seebeck coefficient, and thermal conductivity were measured within the temperature range of 300–830 K. It was found that the K2Ti6O13 whiskers were distributed homogeneously throughout the matrix and contacted with the SnSe grains intimately. Mechanical properties, such as Vickers hardness, flexural strength, compressive strength and fracture toughness of the composites were improved significantly. Especially, upon the addition of 5 vol% K2Ti6O13 whiskers, the flexural strength and compressive strength were almost doubled as compared to K2Ti6O13-free samples. Such substantial enhancement of mechanical properties is an important benefit for the commercial application of thermoelectric devices.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No. 51772231), the Fundamental Research Funds for the Central Universities (Grant Nos. WUT: 2018IB002 and 2018IB007) and the Hubei Provincial Natural Science Foundation of China (Grant No. 2018CFB646).

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Authors and Affiliations

  1. Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics, Wuhan University of Technology, Wuhan, 430070, China

    Junchao Li, Bo Duan, Jialiang Li, Zheng Ruan, Tao Gao, Zhou Fang, Guodong Li, Pengcheng Zhai & Gang Chen

  2. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, China

    Guodong Li & Pengcheng Zhai

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  1. Junchao Li
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  2. Bo Duan
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  3. Jialiang Li
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Correspondence to Bo Duan or Gang Chen.

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Li, J., Duan, B., Li, J. et al. Substantial enhancement of mechanical properties for SnSe based composites with potassium titanate whiskers. J Mater Sci: Mater Electron 30, 8502–8507 (2019). https://doi.org/10.1007/s10854-019-01170-x

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