Zn对Cu-20Sn-10Ti钎焊金刚石界面特征和耐磨性的影响

杜全斌; 姜雪; 崔冰; 陈广明; 李昂; 王蕾; 于奇; 方占江

doi:10.3969/j.issn.1674-6457.2025.06.011

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精密成形工程 ›› 2025, Vol. 17 ›› Issue (6) : 97-108. DOI: 10.3969/j.issn.1674-6457.2025.06.011

精密钎焊

Zn对Cu-20Sn-10Ti钎焊金刚石界面特征和耐磨性的影响

杜全斌^1,2, 姜雪³, 崔冰^3*, 陈广明³, 李昂¹, 王蕾¹, 于奇⁴, 方占江²

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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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摘要

目的改善Cu-20Sn-10Ti钎焊金刚石宏观形貌和界面区钎料合金显微组织,减少钎焊接头孔洞、裂纹和粗大脆性相等缺陷,提高钎焊金刚石工具的磨削性能。方法采用扫描电子显微镜（SEM）、能谱分析仪（EDS）、X射线衍射仪（XRD）和摩擦磨损试验机等设备,研究了Zn对Cu-Sn-Ti钎焊金刚石界面特性及磨削性能的影响规律。结果当Zn质量分数为4.5%时,钎焊金刚石近界面区及钎料层没有产生裂纹和孔洞,具有最佳的宏观形貌和最适宜的金刚石出露度55%。界面区钎料合金显微组织主要由灰色α-Cu相和灰白CuSn₃Ti₅相组成,随着Zn含量的增加,CuSn₃Ti₅相逐渐细化,当Zn质量分数为4.5%时,细化效果最佳。不添加Zn时,钎焊金刚石表面形成了连续致密易剥离的TiC层,随着Zn含量的增加,TiC层逐渐变为断续长絮状、颗粒状,且TiC层厚度逐渐减小。当Zn质量分数为7.5%时,局部生成TiC且无法完全覆盖金刚石表面。随着Zn含量的增加,钎焊金刚石试样的摩擦因数、不均匀磨损率呈先减小后增大的趋势,去除量呈先增大后减小的趋势。当Zn质量分数为4.5%时,钎料金刚石试样具有最小的摩擦因数（0.25）和不均匀磨损率（16.67%）以及最大的材料去除量（49.15 mg）。结论综合钎焊金刚石试样的宏观形貌、界面结合状态和磨削性能,在Cu-20Sn-10Ti钎料中添加Zn的最佳质量分数为4.5%。

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.%.

导出引用

杜全斌, 姜雪, 崔冰, 陈广明, 李昂, 王蕾, 于奇, 方占江. Zn对Cu-20Sn-10Ti钎焊金刚石界面特征和耐磨性的影响[J]. 精密成形工程. 2025, 17(6): 97-108 https://doi.org/10.3969/j.issn.1674-6457.2025.06.011

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

中图分类号： TG146.2

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