Abstract
The microstructural evolution and electrochemical characteristics of brazed porous-coated Ti-6Al-4V alloy were analyzed and compared with respect to the conventionally 1300°C sintering method. The titanium filler metal of low-melting-point (934°C) Ti-15Cu-15Ni was used to braze commercially pure (CP) titanium beads onto the substrate of Ti-6Al-4V alloy at 970°C for 2 and 8 h. Optical microscopy, scanning and transmission electron microscopy, and X-ray diffractometry (XRD) were used to characterize the microstructure and phase of the brazed metal; also, the potentiostat was used for corrosion study. Experimental results indicate that the bead/substrate contact interface of the 970°C brazed specimens show larger contact area and higher radius curvature in comparison with 1300°C sintering method. The microstructure of brazed specimens shows the Widmanstätten structure in the brazed zone and equiaxed α plus intergranular β in the Ti-6Al-4V substrate. The intermetallic Ti 2 Ni phase existing in the prior filler metal diminishes, while the Ti 2 Cu phase can be identified for the substrate at 970 for 2 h, but the latter phase decrease with time. In Hank's solution at 37°C, the corrosion rates of the 1300°C sintering and the 970°C brazed samples are similar at corrosion potential (E corr ) in potentiodynamic test, and the value of E corr for the brazed sample is noble to the sintering samples. The current densities of the brazed specimens do not exceed 100 μA/cm 2 at 3.5 V (SCE). These results suggest that the vacuum-brazed method exhibits the potentiality to manufacture the porous-coated specimens for biomedical application.
| Original language | English |
|---|---|
| Pages (from-to) | 369-377 |
| Number of pages | 9 |
| Journal | Journal of Biomedical Materials Research - Part B Applied Biomaterials |
| Volume | 77 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 2006 May 1 |
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All Science Journal Classification (ASJC) codes
- Biomaterials
- Biomedical Engineering
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Microstructure and corrosion behavior of porous coatings on titanium alloy by vacuum-brazed method. / Lee, Tzer-Min; Chang, E.; Yen, C. H.
In: Journal of Biomedical Materials Research - Part B Applied Biomaterials, Vol. 77, No. 2, 01.05.2006, p. 369-377.Research output: Contribution to journal › Article
TY - JOUR
T1 - Microstructure and corrosion behavior of porous coatings on titanium alloy by vacuum-brazed method
AU - Lee, Tzer-Min
AU - Chang, E.
AU - Yen, C. H.
PY - 2006/5/1
Y1 - 2006/5/1
N2 - The microstructural evolution and electrochemical characteristics of brazed porous-coated Ti-6Al-4V alloy were analyzed and compared with respect to the conventionally 1300°C sintering method. The titanium filler metal of low-melting-point (934°C) Ti-15Cu-15Ni was used to braze commercially pure (CP) titanium beads onto the substrate of Ti-6Al-4V alloy at 970°C for 2 and 8 h. Optical microscopy, scanning and transmission electron microscopy, and X-ray diffractometry (XRD) were used to characterize the microstructure and phase of the brazed metal; also, the potentiostat was used for corrosion study. Experimental results indicate that the bead/substrate contact interface of the 970°C brazed specimens show larger contact area and higher radius curvature in comparison with 1300°C sintering method. The microstructure of brazed specimens shows the Widmanstätten structure in the brazed zone and equiaxed α plus intergranular β in the Ti-6Al-4V substrate. The intermetallic Ti 2 Ni phase existing in the prior filler metal diminishes, while the Ti 2 Cu phase can be identified for the substrate at 970 for 2 h, but the latter phase decrease with time. In Hank's solution at 37°C, the corrosion rates of the 1300°C sintering and the 970°C brazed samples are similar at corrosion potential (E corr ) in potentiodynamic test, and the value of E corr for the brazed sample is noble to the sintering samples. The current densities of the brazed specimens do not exceed 100 μA/cm 2 at 3.5 V (SCE). These results suggest that the vacuum-brazed method exhibits the potentiality to manufacture the porous-coated specimens for biomedical application.
AB - The microstructural evolution and electrochemical characteristics of brazed porous-coated Ti-6Al-4V alloy were analyzed and compared with respect to the conventionally 1300°C sintering method. The titanium filler metal of low-melting-point (934°C) Ti-15Cu-15Ni was used to braze commercially pure (CP) titanium beads onto the substrate of Ti-6Al-4V alloy at 970°C for 2 and 8 h. Optical microscopy, scanning and transmission electron microscopy, and X-ray diffractometry (XRD) were used to characterize the microstructure and phase of the brazed metal; also, the potentiostat was used for corrosion study. Experimental results indicate that the bead/substrate contact interface of the 970°C brazed specimens show larger contact area and higher radius curvature in comparison with 1300°C sintering method. The microstructure of brazed specimens shows the Widmanstätten structure in the brazed zone and equiaxed α plus intergranular β in the Ti-6Al-4V substrate. The intermetallic Ti 2 Ni phase existing in the prior filler metal diminishes, while the Ti 2 Cu phase can be identified for the substrate at 970 for 2 h, but the latter phase decrease with time. In Hank's solution at 37°C, the corrosion rates of the 1300°C sintering and the 970°C brazed samples are similar at corrosion potential (E corr ) in potentiodynamic test, and the value of E corr for the brazed sample is noble to the sintering samples. The current densities of the brazed specimens do not exceed 100 μA/cm 2 at 3.5 V (SCE). These results suggest that the vacuum-brazed method exhibits the potentiality to manufacture the porous-coated specimens for biomedical application.
UR - http://www.scopus.com/inward/record.url?scp=33646363570&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33646363570&partnerID=8YFLogxK
U2 - 10.1002/jbm.b.30440
DO - 10.1002/jbm.b.30440
M3 - Article
C2 - 16278850
AN - SCOPUS:33646363570
VL - 77
SP - 369
EP - 377
JO - Journal of Biomedical Materials Research
JF - Journal of Biomedical Materials Research
SN - 1552-4973
IS - 2
ER -