真空汽相钎焊微簧引脚工艺及高速冲击失效行为

Process of vacuum vapor phase soldering for micro-spring pins and their high-speed impact failure behavior

  • 摘要:
    目的 该文针对高可靠性封装需求,研究了陶瓷柱栅阵列中微簧引脚的高精度装配、钎焊工艺及其高速冲击可靠性。
    方法 通过设计装配工装,实现了1 156根微簧引脚的快速集体装配并采用真空汽相钎焊工艺进行连接。
    结果 界面形成约1 μm厚的Cu-Ni-Sn金属间化合物,实现良好冶金结合,焊后间距精度达±10 μm,焊点空洞率低于5%。剪切试验表明,焊点在高速与低速载荷下剪切力一致(约9.316 3 N),断裂位于微簧根部。通过菊花链试样开展XYZ 3轴高速冲击试验,发现低量级冲击下焊点无失效;高量级冲击下失效发生于微簧本体(脆性断裂),而钎焊接头仍保持完好。
    结论 研究表明,所开发的微簧引脚连接工艺可靠,适用于高抗冲击电子封装场合。

     

    Abstract: Objective This research addresses the requirements for high-reliability packaging by investigating high-precision assembly, soldering process, and high-speed impact reliability of micro-spring pins in ceramic column grid array packaging. Methods By designing assembly tooling, rapid collective assembly of 1 156 micro-spring pins was achieved and bonded with vacuum vapor phase soldering process. Results Metallurgical bond was achieved with the formation of an approximately 1 μm thick Cu-Ni-Sn intermetallic compound at the interface. Post-soldering pin spacing accuracy reached ±10 μm and void rate in soldered joints was reduced to below 5%. Shear tests demonstrated consistent strength (approximately 9.3163 N) under both high-speed and low-speed loading, with fractures occurring at the root of micro-springs. High-speed impact tests along X, Y, Z three axis using daisy-chain samples revealed no failure in soldered joints under low-level impacts, while failures under high-level impacts occurred within micro-spring bodies (exhibiting brittle fracture), with soldered joints remaining intact. Conclusion The results indicate that the developed micro-spring pin connection process is reliable and suitable for high-impact-resistant electronic packaging applications.

     

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