Microstructures and bond strengths of plasma-sprayed hydroxyapatite coatings on porous titanium substrates

Ik Hyun Oh, N. Nomura, A. Chiba, Y. Murayama, N. Masahashi, Byong Taek Lee, S. Hanada

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)

Abstract

Hydroxyapatite (HA) coating was carried out by plasma spraying on bulk Ti substrates and porous Ti substrates having a Young's modulus similar to that of human bone. The microstructures and bond strengths of HA coatings were investigated in this study. The HA coatings with thickness of 200-250 μ m were free from cracks at interfaces between the coating and Ti substrates. XRD analysis revealed that the HA powder used for plasma spraying had a highly crystallized apatite structure, while the HA coating contained several phases other than HA. The bond strength between the HA coating and the Ti substrates evaluated by standard bonding test (ASTM C633-01) were strongly affected by the failure behavior of the HA coating. A mechanism to explain the failure is discussed in terms of surface roughness of the plasma-sprayed HA coatings on the bulk and porous Ti substrates.

Original languageEnglish
Pages (from-to)635-640
Number of pages6
JournalJournal of Materials Science: Materials in Medicine
Volume16
Issue number7
DOIs
Publication statusPublished - 2005 Jul

ASJC Scopus subject areas

  • Biophysics
  • Bioengineering
  • Biomaterials
  • Biomedical Engineering

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