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Y.Z. Lei
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China

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Journal article
Published: 23 July 2020 in Diamond and Related Materials
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In order to reduce the degree of graphitization and excessive embeddedness of the diamonds in the brazing. In this work, graphene nanoplatelets (GNPs) were introduced into the NiCr filler to form composite fillers, and a two-step brazing method was adopted to optimize diamond brazed joints, which included pre-brazing of NiCr composite filler powder on the Q235 steel and followed by vacuum brazing of diamond grits directly. Through pre-brazing, composite filler coatings well combined with Q235 steel were obtained, which mainly composed of Ni(Fe,Cr), Ni3P and Cr3C2 phases. The brazing results showed that the diamond brazed joints with no defect and high diamond exposure were achieved. New carbides of Cr3C2, (Cr,Fe)3C2 and Cr7C3 formed on the surface of the brazed diamonds. The addition of GNPs not only reduced the graphitization and thermal damage of diamond, but also improved the wear resistance of the joints. As the GNPs content increased, the new carbides were refined and the optimal wear resistance with value of 0.264 g was obtained by Ni-Cr + 2% GNPs composite filler. This experiment provides a new direction for the development of composite filler for brazing diamonds.

ACS Style

J. Zhao; M. Guo; S.P. Hu; Y.Z. Lei; X.G. Song; D. Liu; W.M. Long; Z.S. Yu. Brazing of large synthetic diamond grits using graphene nanoplatelets reinforced Ni Cr composite fillers. Diamond and Related Materials 2020, 109, 108004 .

AMA Style

J. Zhao, M. Guo, S.P. Hu, Y.Z. Lei, X.G. Song, D. Liu, W.M. Long, Z.S. Yu. Brazing of large synthetic diamond grits using graphene nanoplatelets reinforced Ni Cr composite fillers. Diamond and Related Materials. 2020; 109 ():108004.

Chicago/Turabian Style

J. Zhao; M. Guo; S.P. Hu; Y.Z. Lei; X.G. Song; D. Liu; W.M. Long; Z.S. Yu. 2020. "Brazing of large synthetic diamond grits using graphene nanoplatelets reinforced Ni Cr composite fillers." Diamond and Related Materials 109, no. : 108004.

Journal article
Published: 18 April 2020 in Metals
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Titanium and zirconia (ZrO2) ceramics are widely used in biomedical fields. This study aims to achieve reliable brazed joints of titanium/ZrO2 using biocompatible Au filler for implantable medical products. The effects of brazing temperature and holding time on the interfacial microstructures and mechanical properties of titanium/Au/ZrO2 joints were fully investigated by scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS) and X-ray diffraction (XRD). The results indicated that the typical interfacial microstructure of the titanium/Au/ZrO2 joint was titanium/Ti3Au layer/TiAu layer/TiAu2 layer/TiAu4 layer/TiO layer/ZrO2 ceramic. With an increasing brazing temperature or holding time, the thickness of the Ti3Au + TiAu + TiAu2 layer increased gradually. The growth of the TiO layer was observed, which promoted metallurgical bonding between the filler metal and ZrO2 ceramic. The optimal shear strength of ~35.0 MPa was obtained at 1150 °C for 10 min. SEM characterization revealed that cracks initiated and propagated along the interface of TiAu2 and TiAu4 reaction layers.

ACS Style

Yuzhen Lei; Hong Bian; Wei Fu; Xiaoguo Song; Jicai Feng; Weimin Long; Hongwei Niu. Evaluation of Biomedical Ti/ZrO2 Joint Brazed with Pure Au Filler: Microstructure and Mechanical Properties. Metals 2020, 10, 526 .

AMA Style

Yuzhen Lei, Hong Bian, Wei Fu, Xiaoguo Song, Jicai Feng, Weimin Long, Hongwei Niu. Evaluation of Biomedical Ti/ZrO2 Joint Brazed with Pure Au Filler: Microstructure and Mechanical Properties. Metals. 2020; 10 (4):526.

Chicago/Turabian Style

Yuzhen Lei; Hong Bian; Wei Fu; Xiaoguo Song; Jicai Feng; Weimin Long; Hongwei Niu. 2020. "Evaluation of Biomedical Ti/ZrO2 Joint Brazed with Pure Au Filler: Microstructure and Mechanical Properties." Metals 10, no. 4: 526.

Journal article
Published: 03 June 2019 in Metals
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Medical titanium and alumina (Al2O3) bioceramic are widely utilized as biomaterials. A reliable brazed joint of titanium and alumina was successfully obtained using biocompatible Au foil for implantable devices in the present study. The interfacial microstructure and reaction products of titanium/Au/Al2O3 joints brazed under different conditions were investigated by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD). In this study, the typical interfacial microstructure of the titanium/Au/Al2O3 joint was titanium/Ti3Au layer/TiAu layer/TiAu2 layer/TiAu4 layer/Au + granular TiAu4 layer/TiOx phase/Al2O3 ceramic. With increasing brazing temperature or holding time, the thicknesses of Ti3Au + TiAu + TiAu2 layers adjacent to the titanium substrate increased gradually. Shear tests indicated that the joint brazed at 1115 °C for 3 min exhibited the highest shear strength of 39.2 MPa. Typical fracture analysis displayed that the crack started at the Al2O3 ceramic and propagated along the interface of TiAu2 and TiAu4 reaction layers.

ACS Style

Hong Bian; Xiaoguo Song; Shengpeng Hu; Yuzhen Lei; Yide Jiao; Shutong Duan; Jicai Feng; Weimin Long. Microstructure Evolution and Mechanical Properties of Titanium/Alumina Brazed Joints for Medical Implants. Metals 2019, 9, 644 .

AMA Style

Hong Bian, Xiaoguo Song, Shengpeng Hu, Yuzhen Lei, Yide Jiao, Shutong Duan, Jicai Feng, Weimin Long. Microstructure Evolution and Mechanical Properties of Titanium/Alumina Brazed Joints for Medical Implants. Metals. 2019; 9 (6):644.

Chicago/Turabian Style

Hong Bian; Xiaoguo Song; Shengpeng Hu; Yuzhen Lei; Yide Jiao; Shutong Duan; Jicai Feng; Weimin Long. 2019. "Microstructure Evolution and Mechanical Properties of Titanium/Alumina Brazed Joints for Medical Implants." Metals 9, no. 6: 644.

Journal article
Published: 14 December 2018 in Metals
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In this study, reliable Ti2AlNb/high-Nb-containing TiAl alloy (TAN) joints were achieved by diffusion bonding. The effects of bonding temperature and holding time on the interfacial microstructure and mechanical properties were fully investigated. The interfacial structure of joints bonded at various temperatures and holding times was characterized by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). The results show that the typical microstructure of the Ti2AlNb substrate/O phase/Al(Nb,Ti)2 + Ti3Al/Ti3Al/TAN substrate was obtained at 970 °C for 60 min under a pressure of 5 MPa. The formation of the O phase was earlier than the Al(Nb,Ti)2 phase when bonding temperature was relatively low. When bonding temperature was high enough, the Al(Nb,Ti)2 phase appeared earlier than the O phase. With the increase of bonding temperature and holding time, the Al(Nb,Ti)2 phase decomposed gradually. As the same time, continuous O phase layers became discontinuous and the Ti3Al phase coarsened. The maximum bonding strength of 66.1 MPa was achieved at 970 °C for 120 min.

ACS Style

Hong Bian; Yuzhen Lei; Wei Fu; Shengpeng Hu; Xiaoguo Song; Jicai Feng. Diffusion Bonding of Ti2AlNb Alloy and High-Nb-Containing TiAl Alloy: Interfacial Microstructure and Mechanical Properties. Metals 2018, 8, 1061 .

AMA Style

Hong Bian, Yuzhen Lei, Wei Fu, Shengpeng Hu, Xiaoguo Song, Jicai Feng. Diffusion Bonding of Ti2AlNb Alloy and High-Nb-Containing TiAl Alloy: Interfacial Microstructure and Mechanical Properties. Metals. 2018; 8 (12):1061.

Chicago/Turabian Style

Hong Bian; Yuzhen Lei; Wei Fu; Shengpeng Hu; Xiaoguo Song; Jicai Feng. 2018. "Diffusion Bonding of Ti2AlNb Alloy and High-Nb-Containing TiAl Alloy: Interfacial Microstructure and Mechanical Properties." Metals 8, no. 12: 1061.