Interfacial properties of Cu/Ni/Mg2Si joints prepared in one step by the spark plasma sintering method

JOURNAL OF ALLOYS AND COMPOUNDS

卷:704

Article

Yang, Renyao¹  Chen, Shaoping^1,2  Fan, Wenhao³  Gao, Xiufeng¹  Long, Yang¹  Wang, Wenxian²  Munir, Zuhair A.⁴ 

[1] Taiyuan Univ Technol, Minist Educ, Key Lab Interface Sci & Engn Adv Mat, Taiyuan 030024, Peoples R China

[2] Taiyuan Univ Technol, Coll Mat Sci & Engn, Taiyuan 030024, Peoples R China

[3] Taiyuan Univ Technol, Coll Phys & Optoelect, Taiyuan 030024, Peoples R China

[4] Univ Calif Davis, Dept Mat Sci & Engn, Davis, CA 95616 USA

关键词: Thermoelectric materials;    SPS;    Magnesium silicide;    Shear strength;    Contact resistance;   

DOI  :  10.1016/j.jallcom.2017.02.082

来源: Elsevier

【 摘 要 】

Cu/Ni/Mg2Si thermoelectric bonded joints were prepared in one step by the spark plasma sintering (SPS) method using Mg and Si powders to form Mg2Si. The microstructure and elemental distribution across the interfaces were determined, and the formation of new phases at the interface was investigated and related to joint properties, including shear strength and contact resistance. Joint formation was accompanied by the formation of two ternary Mg-Si-Ni layers, an eta-layer with Ni2Si as a precipitate next to Ni, and an omega-layer next to Mg2Si. The formation and characteristics of these layers played a major role in determining the shear strength and contact resistance. It was determined that a reactive sintering temperatures in the range 1023-1053 K with a 15-20 min hold time provided the best properties. The maximum shear strength of the joints obtained is 26 MPa for samples sintered at 1023 K. For these samples the contact resistance was 1.44 m Omega cm(2); the minimum value of 1.28 m Omega cm(2) was measured for samples sintered at 1073 K. Long-term thermal stability of joints was also investigated. (C) 2017 Elsevier B.V. All rights reserved.

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