Solder Joint Formation with Sn-Ag-Cu and Sn-Pb Solder Balls and Pastes
Why this work is in the frame
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Bibliographic record
Abstract
ABSTRACT In the transition period from Lead-bearing solder to Lead-Free solder, four metallurgical combinations will be in use: Lead-Free solder with Lead-Free components, Lead-bearing solder with Lead-bearing components, Lead-Free solder with Lead-bearing components, and Lead-bearing solder with Lead-Free components. It is necessary to characterize the joints resulting from these metallurgical combinations in order to optimize process parameters and insure reliable joints. In this study, BGA locations on electroless Ni/ immersion Au (ENIG)-finished boards were reflowed with Sn-3.8Ag-0.7Cu or Sn-37Pb solder balls using Sn-3.8Ag-0.7Cu or eutectic Sn-Pb solder pastes. Some boards were aged at 150°C for 310 hr, 480 hr, and 2160 hr. The four metallurgically different types of solder joints, both as-reflowed and after aging, were shear tested and examined using transmissive X-ray, optical microscopy, scanning electron microscopy, and dispersive X-ray spectroscopy. Some as-reflowed joints were analyzed with Differential Scanning Calorimetry. Solder joint microstructure and composition, intermetallic formation, surface roughness, and voiding were investigated. The influence of structural parameters on shear strength and fracture modes was shown. The differences and similarities between the four different joint metallurgies are discussed.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it