A Connection Method between Ultrahard PtW8 Wire and a Au Thick Film Based on Parallel-Gap Resistance Microwelding
Abstract
:1. Introduction
2. Process Design and Experiment
2.1. Process Design of Parallel-Gap Resistance Microwelding
2.2. Experiment
3. Results and Discussion
3.1. Welded Joint and Microstructure
3.2. Preloading Analysis of Parallel-Gap Resistance Microwelding
3.3. The Temperature Field of the Parallel-Gap Resistance Microwelding
3.4. Wetting Behavior of Liquid Au on the Surface of the Platinum-Tungsten Alloy Wire
3.5. Bonding Mechanism
3.6. Factors Affecting Welded Quality
4. Conclusions
- The ultrahard PtW8 wire was successfully bonded with the Au thick film using parallel-gap resistance microwelding under appropriate welding parameters. The joint strength could be up to 5 cN.
- It was found that the parallel-gap resistance microwelding of PtW8 wire and Au thick film included the following stages: (1) deformation after pressing, (2) partial melting, (3) molten metal wetting and spreading, and (4) solid-state bonding.
- Sufficient local heat generation was the key to high-quality welds because first, it generated sufficient molten metal, and second, it created plastic deformation, and third, it facilitated the wetting and spreading of the molten metal to expand the bonded area.
- Optimizing only the welding voltage, time, and force was insufficient to achieve acceptable joint strength.
Author Contributions
Funding
Conflicts of Interest
References
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Material | Melting Point (°C) | Elasticity Modulus (GPa) |
---|---|---|
Pt | 1769 | 171 |
PtW8 | 1870 | 230 |
Material | Melting Temperature (°C) | Electrical Resistivity (10−8 Ω∙m) | Thermal Conductivity (W∙m−1·K−1) | Elasticity Modulus (GPa) |
---|---|---|---|---|
PtW8 | 1870 | 62 | 71 | 230 |
Au | 1064 | 2.21 | 318 | 79 |
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Pan, M.; Tu, M.; Liu, J. A Connection Method between Ultrahard PtW8 Wire and a Au Thick Film Based on Parallel-Gap Resistance Microwelding. Materials 2020, 13, 2911. https://doi.org/10.3390/ma13132911
Pan M, Tu M, Liu J. A Connection Method between Ultrahard PtW8 Wire and a Au Thick Film Based on Parallel-Gap Resistance Microwelding. Materials. 2020; 13(13):2911. https://doi.org/10.3390/ma13132911
Chicago/Turabian StylePan, Mingqiang, Minghui Tu, and Jizhu Liu. 2020. "A Connection Method between Ultrahard PtW8 Wire and a Au Thick Film Based on Parallel-Gap Resistance Microwelding" Materials 13, no. 13: 2911. https://doi.org/10.3390/ma13132911