2008-Snugovsky-SAC-Whiskers

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Details on Protrusions with Irregular Shape, Striations, and Cracks (cont.) • The shell-like protrusions have a similar microstructure to the hillocks 18 – Sn matrix with very few Cu 6 Sn 5 and/or Ag 3 Sn particles • The two-dimensional striations are evident as – A surface roughness at the edges of the protrusion and – Stripes in the parallel direction – Black lines or wrinkles • The cracks look like a separation between the grains SEM, 1,800X 1 2 3 2 1 3 SEM, 180X SEM, 450X
Details on Protrusions with Irregular Shape, Striations, and Cracks (cont) 19 1 2 Roughness Crack SEM, 6,000X 3 Stripes 3 SEM, 6,000X Ag 3Sn Roughness Stripes Cu 6Sn 5 SEM, 6,000X SEM, 4,000X
Page 1 and 2: Whisker Growth on SAC Solder Joints
Page 3 and 4: Whisker growth from lead-free solde
Page 5 and 6: Visual and SEM Inspection of Solder
Page 7 and 8: Visual and SEM Inspection of Solder
Page 9 and 10: Cross-section Analyses of Solder Jo
Page 11 and 12: Hillock Microstructure (cont.) •
Page 13 and 14: Inter-granular Corrosion and Lead/S
Page 15 and 16: Inter-granular Corrosion and Lead/S
Page 17: Details on Protrusions with Irregul
Page 21 and 22: Virgin Components, Ion Chromatograp
Page 23 and 24: Virgin Components, Plating Quality
Page 25 and 26: Virgin Components, Composition •
Page 27 and 28: Conclusions Precise cross-sectionin
Page 29 and 30: Conclusions (cont.) • There is no
Page 31: 31 Thank you

2008-Snugovsky-SAC-Whiskers

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