Interfacial microstructure and mechanical properties of zirconia ceramic and niobium joints vacuum brazed with two Ag-based active filler metals

Wang, N.; Wang, D.P.; Yang, Zhenwen; Wang, Y.

doi:10.1016/j.ceramint.2016.05.045

Cited by 55 publications

(25 citation statements)

References 38 publications

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“…The chemical composition of Spot E in Zone V detected by EDS analysis showed that the titanium/oxygen atomic ratio was about 1:1. Combined with the results of Ti reacting with ZrO 2 ceramics in previous studies [42,43], it can be deduced that the black layer (Zone V) next to the ZrO 2 side was a TiO layer. Therefore, the active Ti from the substrate had two effects during brazing: one was to react with Au to form Ti-Au compounds, and the other was to react with the ZrO 2 ceramic to form a metallurgical bond.…”

Section: And IV Insupporting

confidence: 57%

Evaluation of Biomedical Ti/ZrO2 Joint Brazed with Pure Au Filler: Microstructure and Mechanical Properties

Lei

Bian

Wang

et al. 2020

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.

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Section: And IV Insupporting

confidence: 57%

Evaluation of Biomedical Ti/ZrO2 Joint Brazed with Pure Au Filler: Microstructure and Mechanical Properties

Lei

Bian

Wang

et al. 2020

Metals

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“…Figure shows the fracture morphology of Al 2 O 3 /Kovar joints brazed with different interlayers at 900°C for 10 minutes. It can be seen from Figure A that fractures mainly occurred in the ceramic substrate near the brazing seam because of the large residual stress in this region . With the addition of Cu interlayers, the ratio of the Al 2 O 3 area to the fracture area was greatly reduced, as shown in Figure .…”

Section: Resultsmentioning

confidence: 91%

“…The wave‐like TiFe 2 –TiNi structure did not change after the addition of Cu foil. The Gibbs free energy for the reaction between Ti and Cu to form TiCu at 900°C is −13.577 kJ/mol, which is much higher than that for the reaction between Fe, Ni and Ti . In addition, there were enough Fe and Ni atoms that dissolved from the Kovar alloy.…”

Section: Resultsmentioning

confidence: 93%

Effects of Cu interlayers on the microstructure and mechanical properties of Al₂O₃/AgCuTi/Kovar brazed joints

Wang

Jin

Yang

et al. 2018

Int J Applied Ceramic Tech

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Al2O3 ceramic and Kovar alloy brazed joints were achieved using three types of Ag‐based interlayers: a AgCuTi foil, a AgCuTi/Cu foil/AgCuTi multi‐interlayer and a AgCuTi/Cu foam/AgCuTi multi‐interlayer. The effects of the addition of Cu interlayers on the interfacial microstructure and mechanical properties of Al2O3/AgCuTi/Kovar brazed joints were investigated. When Kovar alloy and Al2O3 ceramic were brazed with 50 μm Cu foil at 900°C for 10 minutes, the Cu foil was completely dissolved in the liquid filler. A nearly continuous Cu layer remained in the joint when the thickness of the Cu foil reached 100 μm under the same brazing conditions. With the increase in Cu foil thickness, the thickness of Ti–O compounds + Ti3Cu3O reaction layer formed nearby the Al2O3 ceramic first increased and then remained the same. The Al2O3/Kovar joints brazed with 100 μm Cu foil at 900°C for 10 minutes showed a maximum shear strength of 138 MPa. A low brazing temperature was beneficial to maintain the original structure of the Cu foam. Furthermore, when the joints were brazed at 880°C for 10 minutes, the average shear strength of the Al2O3/AgCuTi/Cu foam/AgCuTi/Kovar joints was 140 MPa, which was 30 MPa higher than that of a single AgCuTi interlayer.

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“…It has been reported that this magnitude of difference in the thermal expansion coefficient can generate a large difference in thermal stress. 8) Therefore, it can be considered that the heat shrinkage was less in the bonding sample with INCONEL than in the sample with SUS and, consequently, smaller thermal stress was generated in the SiAlON in the bonding sample with INCONEL, which resulted in the higher bending strength.…”

Section: Bending Testsmentioning

confidence: 99%

Brazed Bonding between SiAlON and Heat-Resistant Alloys with Application of Filler Materials

et al. 2018

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It has been required to improve the heat efficiency of thermal power generation system for the sake of mitigation of the global warming and resource depletion problems. For improving the heat efficiency, it is effective to increase the steam temperature, and as a result, appropriate heatresistant alloys are needed. Although SUS304 stainless steel and Ni-based superalloys have been proposed as promising heat-resistant alloys until now, there still remain some concerns such as high-temperature corrosion by flaming gas and erosion by combustion ash. Thus, the present authors propose SiAlON ceramic coating on SUS304 and INCONEL X-750 because SiAlON has excellent heat, wear and corrosion resistances. In the present study, brazed bonding between SiAlON and these heat-resistant alloys was attempted with the applications of Cu and Ag as a soft filler material to reduce the residual stress generated due to the difference in thermal expansion coefficient between SiAlON and the heat-resistant alloys. As for the bonding with the Cu filler, the SiAlON/Cu/SUS joint was successful when the brazing time was short. However, when the brazing time was long (for example, 60 minutes), Fe-based grains were formed in the Cu filler layer, and the cracks were formed in the SiAlON near the joint interface during cooling in the brazing process. It was considered that the Cu filler was hardened by the formation of the Fe-based grains and could not reduce the residual stress. As for the bonding with the Ag filler, on the other hand, the SiAlON/Ag/SUS joint was successful even for a long brazing time. The SiAlON/Ag/INCONEL joint was also successful. The bending strengths of these SiAlON/Cu/ SUS, SiAlON/Ag/SUS and SiAlON/Ag/INCONEL joints were evaluated by a three point bending test, and the results were approximately 200, 270 and 350 MPa, respectively. In all cases fracture occurred in the SiAlON, which means that the SiAlON and the alloys were strongly bonded.

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Interfacial microstructure and mechanical properties of zirconia ceramic and niobium joints vacuum brazed with two Ag-based active filler metals

Cited by 55 publications

References 38 publications

Evaluation of Biomedical Ti/ZrO2 Joint Brazed with Pure Au Filler: Microstructure and Mechanical Properties

Evaluation of Biomedical Ti/ZrO2 Joint Brazed with Pure Au Filler: Microstructure and Mechanical Properties

Effects of Cu interlayers on the microstructure and mechanical properties of Al₂O₃/AgCuTi/Kovar brazed joints

Brazed Bonding between SiAlON and Heat-Resistant Alloys with Application of Filler Materials

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Interfacial microstructure and mechanical properties of zirconia ceramic and niobium joints vacuum brazed with two Ag-based active filler metals

Cited by 55 publications

References 38 publications

Evaluation of Biomedical Ti/ZrO2 Joint Brazed with Pure Au Filler: Microstructure and Mechanical Properties

Evaluation of Biomedical Ti/ZrO2 Joint Brazed with Pure Au Filler: Microstructure and Mechanical Properties

Effects of Cu interlayers on the microstructure and mechanical properties of Al2O3/AgCuTi/Kovar brazed joints

Brazed Bonding between SiAlON and Heat-Resistant Alloys with Application of Filler Materials

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Effects of Cu interlayers on the microstructure and mechanical properties of Al₂O₃/AgCuTi/Kovar brazed joints