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Vacuum Brazing Diamond Grits with Cu-based or Ni-based Filler Metal

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Abstract

Diamond grits were brazed using Cu-Sn-Cr and Ni-Cr-B-Si filler metals, and the brazed grits were examined for microstructure (SEM, EDS, XRD), microhardness, and compression strength. Results showed that the microstructure of the Cu-based filler metal was uniform and consisted of α-Cu + (α-Cu + δ). Its wettability to the diamond was better than Ni-based filler due to the formation of a thin carbide reaction layer that improved the bond strength between the diamond and steel. The Cu-based filler led to reduced thermal damage to the diamond. The Cr in the filler metal diffused to the steel substrate to form a reaction layer at the filler/steel substrate interface. The microhardness of the Ni filler metal (810-830 HV0.3) was significantly higher than that of Cu filler metal (170-230 HV0.3). The compressive load values of the diamond grits brazed with Cu-based or Ni-based filler metal were 93.7 and 49.2% of the original diamond, and the TI values were 83.7 and 59.8% of the original diamond. Grinding experiments for failure mode in monolayer tools revealed that the tools brazed with Cu-based filler metal had a lower macro-fracture ratio than those brazed using the Ni-based filler.

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Acknowledgments

The authors gratefully acknowledge the fund projects of Suzhou University of Science and Technology of China (No. XKZ201501) and fund of the State Key Laboratory of Advanced Brazing Filler Metals and Technology of China (No. SKLABFMT201003).

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Authors and Affiliations

  1. School of Mechanical Engineering, Suzhou University of Science and Technology, Suzhou, 215009, China

    Wenchun Qi, Jinbin Lu, Yang Li, Shuai Xu, Bangfu Wang & Xinkai Qiu

  2. State Key Laboratory of Advanced Brazing Filler Metals and Technology, Zhengzhou Research Institute of Mechanical Engineering, Zhengzhou, 450001, China

    Sujuan Zhong

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  1. Wenchun Qi
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Correspondence to Jinbin Lu.

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Qi, W., Lu, J., Li, Y. et al. Vacuum Brazing Diamond Grits with Cu-based or Ni-based Filler Metal. J. of Materi Eng and Perform 26, 4112–4120 (2017). https://doi.org/10.1007/s11665-017-2804-6

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  • DOI: https://doi.org/10.1007/s11665-017-2804-6

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