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Journal of Materials Engineering and Performance

Published in:

21-06-2017

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

Authors: Wenchun Qi, Jinbin Lu, Yang Li, Shuai Xu, Sujuan Zhong, Bangfu Wang, Xinkai Qiu

Published in: Journal of Materials Engineering and Performance | Issue 8/2017

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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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Title: Vacuum Brazing Diamond Grits with Cu-based or Ni-based Filler Metal
Authors: Wenchun Qi
Jinbin Lu
Yang Li
Shuai Xu
Sujuan Zhong
Bangfu Wang
Xinkai Qiu
Publication date: 21-06-2017
Publisher: Springer US
Published in: Journal of Materials Engineering and Performance / Issue 8/2017
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-017-2804-6

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