A bioactive calcium phosphate invert glass-ceramic containing β-Ca3(PO4)2 crystals could be joined strongly with a Ti-29Nb-13Ta-4.6Zr alloy consisting of a β-titanium phase by heating the metal on which the mother glass powders with a composition 60CaO·30P2O5·7Na2O· 3TiO2 (mol%) were placed, at 800°C for 1 h in air; the tensile joining strength was estimated to be ∼26 MPa on average. A compositionally gradient layer was developed on the metallic substrate during the heating. When the metal with glass powders on it was heated at 850°C in air, the phosphate glassy phase flowed viscously, permeating the oxide layer formed around the surface of the metal, which was thicker than that formed by heating at 800°C; a compositionally gradient layer was not developed, and a strong joining was not realized. The joining between the glass-ceramic and the metal is suggested to be controlled by viscous flow of the glassy phase in the glass-ceramic and by reaction of the glassy phase with the oxide phase formed around the surface layer of the metal.
|Number of pages||3|
|Journal||Journal of the American Ceramic Society|
|Publication status||Published - 2003 Jun|
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry