Ni/Bi0.4Sb1.6Te3热电材料的界面性能

doi:10.19976/j.cnki.43-1448/TF.2021085

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Abstract The barrier layer between the Bi_0.4Sb_1.6Te₃ thermoelectric material and the metal electrode is the controlling factor for the stable service of the thermoelectric device. In this paper, the spark plasma sintering diffusion welding method was used to prepare a Ni layer on the Bi_0.4Sb_1.6Te₃ surface as a barrier layer for the Ni/Bi_0.4Sb_1.6Te₃ electrode joint, in which high-density Ni foil and Bi_0.4Sb_1.6Te₃ alloy were used as the raw materials. The phase analysis of the barrier layer was performed using X-ray diffractometer. The interface morphology and element distribution of the electrode joints were analyzed by the scanning electron microscope and its energy spectrometer. The results show that the Ni foil annealed at 700 ℃ has excellent anti-diffusion effect, and the diffusion thickness is as low as 9 μm. The Ni foil annealed at 700 ℃ is combined with Bi_0.4Sb_1.6Te₃ by diffusion welding to obtain a bonding strength of 13.19 MPa. As the annealing temperature of Ni foil increases, Ni/Bi_0.4Sb_1.6Te₃ interface cracks are significantly improved. This is because the lattice mismatch between Ni/Bi_0.4Sb_1.6Te₃ can be improved with the incresing annealing temperature of Ni foil, thereby the connection performance of the Ni layer and Bi_0.4Sb_1.6Te₃ is improved.

Key words： Ni foil Bi_0.4Sb_1.6Te₃ alloy diffusion welding barrier layer diffusion layer

Received: 21 October 2021 Published: 28 February 2022

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	KUANG Zhixiang
	MA Yan
	XU Chenhui
	KONG Dong
	FENG Bo
	FAN Xi'an

Cite this article:

KUANG Zhixiang,MA Yan,XU Chenhui, et al. Interface performance of Ni/Bi_0.4Sb_1.6Te₃ thermoelectric material[J]. Materials Science and Engineering of Powder Metallurgy, 2022, 27(1): 77-82.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2021085 OR http://pmbjb.csu.edu.cn/EN/Y2022/V27/I1/77

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