Shear Strength and Aging Characteristics of Sn-3.0Ag-0.5Cu/Cu Solder Joint Reinforced with ZrO2 Nanoparticles
Abstract
:1. Introduction
2. Materials and Methods
2.1. Sample Preparation
2.2. Soldering and Microstructure Analysis
2.3. Joint Strength Evaluation and Fractography
3. Results and Discussion
3.1. Effect of ZrO2 NPs Size on the Microstructure of SAC 305/Cu Shear Joints
3.2. Effect of ZrO2 NPs Size on the Interfacial Cu6Sn5 Evolution in SAC 305/Cu Shear Joints
3.3. Effect of ZrO2 NPs Size on the Cu6Sn5 aging Kinetics in SAC 305/Cu Shear Joints
3.4. Effect of ZrO2 Nanoparticle Size on the Shear Strength and Fracture Behavior of SAC 305/Cu Interface
4. Conclusions
- (1).
- Microstructure of the as-reflow nanocomposite SAC 305-ZrO2/Cu joints exhibited higher eutectic area with refined β-Sn grain and Ag3Sn IMC as compared to the monolithic SAC 305/Cu joints. In particular, ZrO2 A NPs addition has contributed to a finer β-Sn and Ag3Sn grain size of 3.5 ± 2.0 μm and 0.41 ± 0.03 μm respectively with higher eutectic area as compared to the ZrO2B.
- (2).
- NPs in the SAC solder suppressed the thickness of Cu6Sn5 IMC at the interface from 2.6 ± 0.9 μm in monolithic to 1.7 ± 0.5 μm and 2.1 ± 0.7 μm for SAC 305-ZrO2A/Cu and SAC 305-ZrO2B/Cu joint respectively.
- (3).
- For all the investigated samples, IMC thickness increased linearly with the square root of aging time and the growth kinetics followed empirical-power law, indicating diffusion-controlled IMC growth. Addition of ZrO2 NPs decreased the diffusion coefficient remarkably. Notably, ZrO2A added SAC 305/Cu joint displayed the smallest diffusion co-efficient of 3.83 × 10–17 m/s. This is due to the presence of higher number of ZrO2 NPs effectively blocking the diffusion of Cu and Sn at the interface
- (4).
- SAC 305-ZrO2A/Cu joints exhibited highest shear strength of 39.7 ± 1.9 MPa in the as-reflow condition owing to finer Ag3Sn IMC with reduced spacing as compared to SAC 305-ZrO2A/Cu joints. Generally, the shear strength of all joints decreased with the aging time. The decline in shear strengths upon aging can be related with the coarsening of Ag3Sn and the growth of Cu-Sn IMC at the interface. ZrO2A added SAC 305/Cu joint exhibited highest shear strength of after 256 h of aging due to the presence of fine Ag3Sn precipitates in the bulk solder.
- (5).
- Fracture analysis shows a ductile fracture mode for all the SAC 305-ZrO2A/Cu until 144 h of aging. After 256 h of aging, both SAC 305-ZrO2A/Cu and SAC 305-ZrO2B/Cu joints fractured by mixed fracture mode at the solder/IMC interface.
Author Contributions
Funding
Conflicts of Interest
References
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Sample | Ag3Sn (μm) | Ag3Sn Spacing (μm) | β-Sn Grain Size (μm) | Eutectic Area % | ||
---|---|---|---|---|---|---|
Length | Width | Grain Size | ||||
SAC 305 | 4.9 ± 1.2 | 0.63 ± 0.08 | 2.7 ± 0.6 | 2.4 ± 1.4 | 21.1 ± 3.3 | 16.6 |
SAC 305-ZrO2A | 0.45 ± 0.07 | 0.37 ± 0.03 | 0.41 ± 0.03 | 0.56 ± 0.08 | 3.5 ± 2.0 | 32.4 |
SAC 305-ZrO2B | 1.4 ± 1.1 | 0.71 ± 0.07 | 1.0 ± 0.5 | 0.89 ± 0.1 | 11.3 ± 4.1 | 26.9 |
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Rajendran, S.H.; Hwang, S.J.; Jung, J.P. Shear Strength and Aging Characteristics of Sn-3.0Ag-0.5Cu/Cu Solder Joint Reinforced with ZrO2 Nanoparticles. Metals 2020, 10, 1295. https://doi.org/10.3390/met10101295
Rajendran SH, Hwang SJ, Jung JP. Shear Strength and Aging Characteristics of Sn-3.0Ag-0.5Cu/Cu Solder Joint Reinforced with ZrO2 Nanoparticles. Metals. 2020; 10(10):1295. https://doi.org/10.3390/met10101295
Chicago/Turabian StyleRajendran, Sri Harini, Seung Jun Hwang, and Jae Pil Jung. 2020. "Shear Strength and Aging Characteristics of Sn-3.0Ag-0.5Cu/Cu Solder Joint Reinforced with ZrO2 Nanoparticles" Metals 10, no. 10: 1295. https://doi.org/10.3390/met10101295