Effect of Zn on Interface Characteristics and Wear Resistance of Cu-20Sn-10Ti Brazed Diamond

DU Quanbin; JIANG Xue; CUI Bing; CHEN Guangming; LI Ang; WANG Lei; YU Qi; FANG Zhanjiang

doi:10.3969/j.issn.1674-6457.2025.06.011

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (6) : 97-108. DOI: 10.3969/j.issn.1674-6457.2025.06.011

Precision Brazing

Effect of Zn on Interface Characteristics and Wear Resistance of Cu-20Sn-10Ti Brazed Diamond

DU Quanbin^1,2, JIANG Xue³, CUI Bing^3*, CHEN Guangming³, LI Ang¹, WANG Lei¹, YU Qi⁴, FANG Zhanjiang²

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Abstract

The work aims to improve the macroscopic morphology of Cu-20Sn-10Ti brazed diamond and the microstructure of the filler metal alloy in the interface region, reduce defects such as voids, cracks, and coarse brittle phases in the brazed joint, and enhance the grinding performance of the brazed diamond tools. Equipment such as scanning electron microscope (SEM), energy-dispersive spectrometer (EDS), X-ray diffractometer (XRD), and friction and wear tester were used to study the influence of Zn on the interface characteristics and grinding performance of Cu-Sn-Ti brazed diamond. When the Zn content was 4.5wt.%, there were no cracks and voids in the near-interface region and the filler metal layer of the brazed diamond. It had the best macroscopic morphology and the most suitable diamond exposure degree of 55%. The microstructure of the filler metal alloy in the interface region was mainly composed of gray α-Cu phases and gray-white CuSn₃Ti₅ phases. With the increase of Zn content, CuSn₃Ti₅ phases were gradually refined, and the refinement effect was the best when the Zn content was 4.5wt.%. Without adding Zn, a continuous, dense, and easily peeled TiC layer was formed on the surface of the brazed diamond. As the Zn content increased, the TiC layer gradually changed to intermittent long-flocculent and granular, and the thickness of the TiC layer gradually decreased. When the Zn content was 7.5wt.%, TiC was locally generated and could not completely cover the diamond surface. With the increase of Zn content, the friction coefficient and non-uniform wear rate of the brazed diamond samples first decreased and then increased, while the removal amount first increased and then decreased. When the Zn content was 4.5wt.%, the brazed diamond sample had the smallest friction coefficient (0.25), the smallest non-uniform wear rate (16.67%), and the largest material removal amount (49.15 mg). In conclusion, considering the macroscopic morphology, interface bonding state, and grinding performance of the brazed diamond samples, the optimal Zn content added to the Cu-20Sn-10Ti filler metal is 4.5wt.%.

Key words

diamond / Cu-20Sn-10Ti filler alloy / microstructure / interface characteristics / grinding performance

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DU Quanbin, JIANG Xue, CUI Bing, CHEN Guangming, LI Ang, WANG Lei, YU Qi, FANG Zhanjiang. Effect of Zn on Interface Characteristics and Wear Resistance of Cu-20Sn-10Ti Brazed Diamond[J]. Journal of Netshape Forming Engineering. 2025, 17(6): 97-108 https://doi.org/10.3969/j.issn.1674-6457.2025.06.011

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Funding

Key Scientific Research Projects of Colleges and Universities in Henan Province (24A460008); Key Research and Promotion Special Science and Technology Tackling Projects of Henan Province (242102220064, 241111231600)