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Growth of an intermetallic compound layer with Sn-3.5Ag-5Bi on Cu and Ni-P/Cu during aging treatment

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Abstract

Growth kinetics of intermetallic compound (IMC) layers formed between the Sn-3.5Ag-5Bi solder and the Cu and electroless Ni-P substrates were investigated at temperatures ranging from 70°C to 200°C for 0–60 days. With the solder joints between the Sn-Ag-Bi solder and Cu substrates, the IMC layer consisted of two phases: the Cu6Sn5 (η phase) adjacent to the solder and the Cu3Sn (ε phase) adjacent to the Cu substrate. In the case of the electroless Ni-P substrate, the IMC formed at the interface was mainly Ni3Sn4, and a P-rich Ni (Ni3P) layer was also observed as a by-product of the Ni-Sn reaction, which was between the Ni3Sn4 IMC and the electroless Ni-P deposit layer. With all the intermetallic layers, time exponent (n) was approximately 0.5, suggesting a diffusion-controlled mechanism over the temperature range studied. The interface between electroless Ni-P and Ni3P was planar, and the time exponent for the Ni3P layer growth was also 0.5. The Ni3P layer thickness reached about 2.5 µm after 60 days of aging at 170°C. The activation energies for the growth of the total Cu-Sn compound layer (Cu6Sn5 + Cu3Sn) and the Ni3Sn4 IMC were 88.6 kJ/mol and 52.85 kJ/mol, respectively.

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Authors and Affiliations

  1. Department of Advanced Materials Engineering, Sungkyunkwan University, 440-746, Suwon, Korea

    Jeong-Won Yoon & Seung-Boo Jung

  2. R&D Center, SAMSUNG ELECTRO-MECHANICS Co., Ltd. 314, 442-743, Suwon, Korea

    Chang-Bae Lee

Authors
  1. Jeong-Won Yoon
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  2. Chang-Bae Lee
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  3. Seung-Boo Jung
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Yoon, JW., Lee, CB. & Jung, SB. Growth of an intermetallic compound layer with Sn-3.5Ag-5Bi on Cu and Ni-P/Cu during aging treatment. J. Electron. Mater. 32, 1195–1202 (2003). https://doi.org/10.1007/s11664-003-0011-8

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