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논문 기본 정보

자료유형
학술저널
저자정보
Mi-Song Kim (Korea Electronics Technology Institute) Won Sik Hong (Korea Electronics Technology Institute) Hye-Min Lee (Korea Electronics Technology Institute) Myeongin Kim (Korea Electronics Technology Institute)
저널정보
대한용접·접합학회 대한용접·접합학회지 大韓熔接·接合學會誌 第40卷 第3號
발행연도
2022.6
수록면
207 - 215 (9page)

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초록· 키워드

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In this study, the degradation characteristics of solder joints composed of powder-size Sn-3.0Ag-0.5Cu and the substrate surface finish are compared. Reflow is performed at a N₂ ambient to apply an organic solderability preservative (OSP), electroless nickel/immersion gold (ENIG) substrates, and solder pastes of Type 6 (5-15 ㎛) and Type 7 (2-11 ㎛). Subsequently, a thermal shock test (TST) is performed for 1,500 cycles at a temperature of -40 ℃ to 125 ℃ (dwell time of 10 min) to analyze the deterioration characteristics. After N₂ reflow is performed, the void content of the OSP substrate/solder joints is higher than that of the ENIG substrate/solder joints, and the shear strength of the ENIG substrate/solder joints is higher than that of the OSP substrate/solder joints. After 500 TST cycles, the shear strength at the OSP substrate/Type 7 solder joints does not decrease, whereas the shear strength at the ENIG substrate/Type 7 solder joints decreases by approximately 25%. Cross-sectional analysis shows that Cu<SUB>6</SUB>Sn<SUB>5</SUB> and (Ni,Cu)₃Sn₄ intermetallic compounds (IMCs) emerged in the OSP and ENIG interfaces, respectively. The increasing rate of IMC thickness at the Type 7 solder joints is higher than that at the Type 6 solder joints. Fracture analysis shows that the OSP and ENIG joints fractured in the solder and solder/IMC interfaces, respectively. The IMC of the OSP and ENIG joints exhibit scallop and needle shapes, respectively. The ENIG joints fractured at the solder/IMC interface because of a stress concentration in the needle-type IMC. After 1500 TST cycles, the shear strength of all samples decreases by more than 50%. Cross-sectional analysis shows a crack at the solder joints of all samples after 1,000 cycles. The decrease in shear strength is caused by these cracks.

목차

Abstract
1. Introduction
2. Experimental Method
3. Experimental Results
4. Conclusions
References

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UCI(KEPA) : I410-ECN-0101-2022-581-001327551