Calcium phosphate invert glass-ceramic coatings joined by self-development of compositionally gradient layers on a titanium alloy

Toshihiro Kasuga, Takeshi Mizuno, Mikio Watanabe, Masayuki Nogami, Mitsuo Niinomi

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)

Abstract

A glass-ceramic layer containing β-Ca3(PO4)2 crystals could be joined easily with a new type of titanium alloy (Ti-29Nb-13Ta-4.6Zr) consisting of a β-titanium phase by heating the metal, on which glass powders with a composition of 60CaO·30P2O5·7Na2O·3TiO2 were placed, at 800°C in air. Measurement of tensile bonding strength revealed that the joining between the coating layer and the substrate is very strong. Even after the large deformation (e.g., ≈90° in bending angle) of the titanium alloy, the coating layer was not peeled off from the substrate. A compositionally gradient layer in the TiO2-P2O5-Na2O-CaO system is developed automatically on the titanium alloy during the heating, resulting in the formation of the strong joining. By soaking in simulated body fluid at 37°C, hydroxyapatite phase was formed newly on the surface of the coating layer.

Original languageEnglish
Pages (from-to)577-582
Number of pages6
JournalBiomaterials
Volume22
Issue number6
DOIs
Publication statusPublished - 2001 Mar 15

Keywords

  • Coating
  • Glass
  • Glass-ceramic
  • Titanium alloy
  • β-Tricalcium phosphate

ASJC Scopus subject areas

  • Bioengineering
  • Ceramics and Composites
  • Biophysics
  • Biomaterials
  • Mechanics of Materials

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