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

Se-Ho Kee; Sang-Yoon Park; Young-Ku Heo; Jae-Pil Jung; Won-Joong Kim

doi:10.4047/jkap.2012.50.3.169

Journal List > J Korean Acad Prosthodont > v.50(3) > 1034700

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Kee, Park, Heo, Jung, and Kim: Brazing characteristics of ZrO2 and Ti-6Al-4V brazed joints with increasing temperature

Original Article

The Journal of Korean Academy of Prosthodontics

The Journal of Korean Academy of Prosthodontics 2012; 50(3): 169-175.

Published online: 31 July 2012

DOI: https://doi.org/10.4047/jkap.2012.50.3.169

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

Se-Ho Kee, MSc¹, Sang-Yoon Park, MSc¹, Young-Ku Heo, PhD², Jae-Pil Jung, PhD¹, 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: wjkim@uos.ac.kr

Received 7 June 2012 Revised 1 July 2012 Accepted 17 July 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 and Tables

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℃.

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

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