Open Access, Peer-reviewed, Quarterly
pISSN 0301-2875
eISSN 2005-3789
    J Korean Acad Prosthodont. 2012 Jul;50(3):169-175. Korean.
    Published online Jul 31, 2012.
    https://doi.org/10.4047/jkap.2012.50.3.169
    Copyright © 2012 The Korean Academy of Prosthodontics
    Original Article

    Brazing characteristics of ZrO2 and Ti-6Al-4V brazed joints with increasing temperature

    Se-Ho Kee, MSc,1 Sang-Yoon Park, MSc,1 Young-Ku Heo, PhD,2 Jae-Pil Jung, PhD,1 and Won-Joong Kim, PhD1
      • 1Department of Materials Science and Engineering, University of Seoul, Seoul, Korea.
      • 2NeoBiotech, Seoul, Korea.
    • Corresponding Author: Won-Joong Kim. University of Seoul, Department of Materials Science and Engineering, 90, Junnong-dong, Dongdaemun-gu, Seoul, 130-743, Korea. +82 2 2210 2541: Email: wjkim@uos.ac.kr
    Received June 07, 2012; Revised July 01, 2012; Accepted July 17, 2012.

    Abstract

    Purpose

    In this study, brazing characteristics of ZrO2 and Ti-6Al-4V brazed joints with increasing temperature were investigated.

    Materials and methods

    The sample size of the ZrO2 was 3 mm × 3 mm × 3 mm (thickness), and Ti-6Al-4V was 10 mm (diameter) × 5 mm (thickness). The filler metal consisted of Ag-Cu-Sn-Ti was prepared in powder form. The brazing sample was heated in a vacuum furnace under 5 × 10-6 torr atmosphere, while the brazing temperature was changed from 700 to 800℃ for 30 min.

    Results

    The experimental results shows that brazed joint of ZrO2 and Ti-6Al-4V occurred at 700 - 800℃. Brazed joint consisted of Ag-rich matrix and Cu-rich phase. A Cu-Ti intermetallic compounds and a Ti-Sn-Cu-Ag alloy were produced along the Ti-6Al-4V bonded interface. Thickness of the reacted layer along the Ti-6Al-4V bonded interface was increased with brazing temperature. Defect ratios of ZrO2 and Ti-6Al-4V bonded interfaces decreased with brazing temperature.

    Conclusion

    Thickness and defect ratio of brazed joints were decreased with increasing temperature. Zirconia was not wetting with filler metal, because the reaction between ZrO2 and Ti did not occur enough.

    Keywords
    Dental implant; Active metal brazing; Joining; Titanium

    Figures

    Fig. 1
    Schematic of brazing sample.

    Fig. 2
    Thickness and defect ratio with increasing temperature. A: Thickness, B: Defect ratio.

    Fig. 3
    ZrO2/Ti alloy brazing sample.

    Fig. 4
    SEM images of ZrO2/Filler metal/Ti alloy interface at, (A) 700℃, (B) 750℃, (C) 800℃ for 30 min.

    Fig. 5
    (A) Enlarged SEM image at filler metal/Ti-6Al-4V interface with (B) EDS line scanning profile for the diffusion layer at 750℃.

    Fig. 6
    EDS mapping for the interface at, (A) 700℃, (B) 750℃, (C) 800℃.

    Fig. 7
    XRD Analysis for the interface at, (A) 700℃, (B) 750℃, (C) 800℃.

    Fig. 8
    Cu-Ti phase diagram.

    Fig. 9
    SEM Images of (A) defect in ZrO2/filler metal and (B) enlarged SEM Image at 700℃.

    Tables

    Table 1
    Mean and standard deviation of thickness of brazed joints

    Table 2
    Mean and standard deviation of defect ratio of brazed joints

    Table 3
    Compositions of phases of points (1)-(4) from Fig. 2 by EDS

    References

      1. Lee JB, Kim DC, Nam DG, Kang NH, Kim SK, Yu JH, Rhym YM, Park YD. Assessment of Resistance Spot Weldability of Dissimilar Joints of Austenitic Stainless Steels/IF Steels and Ferritic Stainless Steels/IF Steels. J Korean Inst Met Mater 2011;49:64–72.
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    MeSH Terms
    Alloys
    Atmosphere
    Dental Implants
    Hot Temperature
    Joints
    Sample Size
    Titanium
    Vacuum
    Zirconium
    Metrics
    Share
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