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In this paper, the interfacial reactions of Sn-8Zn-3Bi and Sn-8Zn-3Bi-0.3Cr solders with Cu pads and the growth of IMCs during long-term aging treatment were presented and discussed. Less than 3 mum Cu5Zn8 IMC layer was found at the Sn-8Zn-3Bi-(0.3)Cr/Cu during the reflow at 230degC for 1 min. During solid state aging treatment at 150degC for 4, 9, 16, 25 days, the Cu5Zn8 IMC grown up with the extension...
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