Interfacial Microstructure and Shear Strength of Brazed Cu-Cr-Zr Alloy Cylinder and Cylindrical Hole by Au Based Solder
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Discussion
3.1. Properties of the Au Based Solder
3.2. Sintering of the Solder to the Surface of the Cu-Cr-Zr Cylinder and the Microstructure
3.3. The Brazed Microstructure and Shear Strength
3.3.1. Effect of the Brazing Temperature and the Holding Time
3.3.2. Effect of the Brazing with Side Solder Feeding
4. Conclusions
- (1)
- The proper process parameters for sintering of a Au-Ge solder on the surface of the Cu-Cr-Zr cylinder by half sets are, first, heating the temperature to 320 °C at the rate of 180 °C/h and holding at the temperature for 20 min, then, heating the temperature to 420 °C at the rate of 200 °C/h and holding at the temperature for 15 min.
- (2)
- For brazing without side solder melt feeding, the highest brazed shear strength was 87.05 MPa. There were a number of voids and micro cracks along the interface of the cylinder and the sleeve due to lack of enough melt feeding and the congregation of large amounts of Ge-Ni particles with about 55.2 wt % Ge and 43.17 wt % Ni during solidification of the solder melt. High brazing temperature and long holding time at the temperature accelerate formation of these micro defects. One suitable condition was brazing at a temperature of 535 °C and holding at this temperature for 10 min.
- (3)
- For brazing by side solder melt feeding, the brazed shear strength was increased to 102.95 MPa. Furthermore, the brazed shear strength of about 100 MPa can be achieved even for large clearances of 0.011–0.015 mm between the cylinder and the sleeve at one side.
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Temperature/°C | 1# | 2# | 3# | 4# | 5# | 6# | Average Shear Strength/MPa | Standard Deviations |
---|---|---|---|---|---|---|---|---|
500 | 83.1 | 84.4 | 86.5 | 81.8 | 78.4 | 74.9 | 81.52 | 4.22 |
535 | 85.3 | 92.7 | 87.5 | 84.2 | 83.9 | 88.7 | 87.05 | 3.35 |
550 | 52.7 | 43.8 | 50.2 | 48.6 | 53.1 | 47.9 | 49.38 | 3.45 |
Holding Time/min | 1# | 2# | 3# | 4# | 5# | 6# | Average Shear Strength/MPa | Standard Deviations |
---|---|---|---|---|---|---|---|---|
10 | 85.3 | 92.7 | 87.5 | 84.2 | 83.9 | 88.7 | 87.05 | 3.35 |
20 | 66.6 | 69.9 | 64.7 | 68.2 | 74.8 | 69.2 | 68.90 | 3.44 |
30 | 58.4 | 57.9 | 57.4 | 61.8 | 60.2 | 57.6 | 58.88 | 1.75 |
1# | 2# | 3# | 4# | 5# | 6# | Average Shear Strength/MPa | Standard Deviations |
---|---|---|---|---|---|---|---|
102.2 | 105.7 | 102.5 | 100.3 | 101.9 | 105.1 | 102.95 | 2.05 |
Sample | 1# | 2# | 3# | 4# | 5# | 6# | 7# | 8# | 9# | 10# | 11# | 12# | Average |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Clearance/mm | 0.011 | 0.013 | 0.010 | 0.014 | 0.015 | 0.012 | 0.012 | 0.011 | 0.014 | 0.013 | 0.013 | 0.015 | 0.01275 |
Shear strength/MPa | 102.3 | 103.1 | 98.8 | 99.6 | 105.3 | 102.7 | 105.3 | 103.6 | 104.2 | 101.8 | 103.1 | 104.2 | 102.83 |
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Li, Z.; Yi, Y.; He, D.; Lai, R. Interfacial Microstructure and Shear Strength of Brazed Cu-Cr-Zr Alloy Cylinder and Cylindrical Hole by Au Based Solder. Metals 2017, 7, 247. https://doi.org/10.3390/met7070247
Li Z, Yi Y, He D, Lai R. Interfacial Microstructure and Shear Strength of Brazed Cu-Cr-Zr Alloy Cylinder and Cylindrical Hole by Au Based Solder. Metals. 2017; 7(7):247. https://doi.org/10.3390/met7070247
Chicago/Turabian StyleLi, Zaihua, Youping Yi, Diqiu He, and Ruilin Lai. 2017. "Interfacial Microstructure and Shear Strength of Brazed Cu-Cr-Zr Alloy Cylinder and Cylindrical Hole by Au Based Solder" Metals 7, no. 7: 247. https://doi.org/10.3390/met7070247