Effects of Rare Earth Ce on the Brazing Performance of High Energy Mechanical Milling Cu-Based Alloy Powder
Abstract
:1. Introduction
2. Experimental
3. Results and Discussion
3.1. As-Milled Cu-Based Alloy Powder
3.2. Transverse Rupture Strength of Cu-Based Alloy
3.3. Microstructure of Brazing Layer
3.4. Climbing Height of the Cu-Based Alloy
3.5. Wear Characteristics of Brazed Diamonds
4. Conclusions
- (1)
- The average particle sizes of the milled Cu-based alloy powders decreased with the increase of milling time. When the milling speed was 200 r/min and the milling time was 20 h, the particle size of the powders reduced significantly to 1 μm, and particle size distribution became more uniform. It was helpful to improve the specific surface areas and sintering activity of Cu-based alloy powders.
- (2)
- The transverse rupture strength was increased with the increase of Ce content. The transverse rupture strength reached the maximum value 475 MPa when the addition of Ce was 0.75 wt %. Rare earth Ce could improve the densification and ductility of the specimen; the fracture surface consisted of many obvious dimples and the micro-pores disappeared.
- (3)
- The addition of rare earth Ce could promote the refinement of Cu6Sn5 and CuTi2 grains in the brazing layer, which effectively reduced the formation and propagation of cracks. Rare earth Ce effectively increased the wettability of the Cu-based alloy and formed a massive support profile; it was beneficial to make it harder for the diamond grits to be pulled out from the matrix.
- (4)
- The diamonds brazed with Cu-based alloy containing 0.75 wt % Ce mainly suffered integrity, micro-fracture, fracture and rubdown; pull-out of the diamond could not happen easily due to the strong adhesion between the diamonds and Cu-based alloy. The milled Cu-based alloy powder containing 0.75 wt % Ce has great potential for preparation of diamond tools.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Element | A Area | B Area | ||
---|---|---|---|---|
Atom (%) | Element (wt %) | Atom (%) | Element (wt %) | |
Cu | 54.87 | 39.42 | 34.26 | 40.87 |
Sn | 45.13 | 60.58 | - | - |
Ti | - | - | 65.74 | 59.13 |
Total | 100 | 100 | 100 | 100 |
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Wu, Q.; Luo, Z.; Wang, Y.; Zhao, H.; Deng, Z. Effects of Rare Earth Ce on the Brazing Performance of High Energy Mechanical Milling Cu-Based Alloy Powder. Metals 2018, 8, 495. https://doi.org/10.3390/met8070495
Wu Q, Luo Z, Wang Y, Zhao H, Deng Z. Effects of Rare Earth Ce on the Brazing Performance of High Energy Mechanical Milling Cu-Based Alloy Powder. Metals. 2018; 8(7):495. https://doi.org/10.3390/met8070495
Chicago/Turabian StyleWu, Qiaoping, Zhuo Luo, Yu Wang, Heng Zhao, and Zhaohui Deng. 2018. "Effects of Rare Earth Ce on the Brazing Performance of High Energy Mechanical Milling Cu-Based Alloy Powder" Metals 8, no. 7: 495. https://doi.org/10.3390/met8070495