Microstructure and corrosion behavior of porous coatings on titanium alloy by vacuum-brazed method

Tzer-Min Lee, E. Chang, C. H. Yen

Research output: Contribution to journalArticle

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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 languageEnglish
Pages (from-to)369-377
Number of pages9
JournalJournal of Biomedical Materials Research - Part B Applied Biomaterials
Volume77
Issue number2
DOIs
Publication statusPublished - 2006 May 1

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Titanium alloys
Sintering
Vacuum
Corrosion
Coatings
Filler metals
Microstructure
Substrates
Titanium
Microstructural evolution
Corrosion rate
X ray diffraction analysis
Intermetallics
Optical microscopy
Melting point
Current density
Metals
Transmission electron microscopy
Scanning electron microscopy
titanium alloy (TiAl6V4)

All Science Journal Classification (ASJC) codes

  • Biomaterials
  • Biomedical Engineering

Cite this

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title = "Microstructure and corrosion behavior of porous coatings on titanium alloy by vacuum-brazed method",
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 Widmanst{\"a}tten 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.",
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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 journalArticle

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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.

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