Novel machinable calcium phosphate glass-ceramics for biomedical use

Toshihiro Kasuga, Masayuki Nogami, Mitsuo Niinomi

Research output: Contribution to journalConference articlepeer-review

3 Citations (Scopus)


SiO2-free calcium phosphate glass-ceramics with easy machinability were prepared by heat-treatment of a 60CaO-30P2O5-3TiO2-7Na2O (in mol%) glass. The glass-ceramics containing β-Ca2P2O7 and β-Ca3(PO4)2 crystals were found to show good machinability, as confirmed by a drilling test using a conventional carbide tool. SEM observation of the glass-ceramic showed that β-Ca2P2O7 crystals having a layered morphology are interlocking one another; plate-like crystals of several tens nanometers in thickness are piled up. The easy machinability of the glass-ceramics was suggested to result from the cleavage of β-Ca2P2O7 crystals precipitated in the glass. The glass-ceramics formed bonelike apatite crystals on the surface in simulated body fluid. The glass-ceramics were also found to be strongly joined with a new β-type titanium alloy, Ti-29Nb-13Ta-4.6Zr, by heating in air.

Original languageEnglish
Pages (from-to)3183-3188
Number of pages6
JournalMaterials Science Forum
Issue number4
Publication statusPublished - 2003
Externally publishedYes
EventThermec 2003 Processing and Manufacturing of Advanced Materials - Madrid, Spain
Duration: 2003 Jul 72003 Jul 11


  • Ap atite formation
  • Bioactivity
  • Biomaterial
  • Calcium phosphate
  • Coating
  • Glass
  • Glass-ceramic
  • Machinability
  • Sintering
  • Titanium alloy

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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