Novel method for hydroxyapatite coating by hydrothermal hot-pressing via double layered capsule

Takamasa Onoki, Toshiyuki Hashida

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

A new hydrothermal method is proposed which enables us to prepare thin hydroxyapatite (HA) ceramic coatings on Ti substrates with a curved surface at low temperatures. The method uses double layered capsules in order to produce a suitable hydrothermal condition; the inner capsule encapsulates the coating materials and a Ti substrate, and the outer capsule is subjected to isostatic pressing under the hydrothermal condition. In this study, it is demonstrated that a pure HA ceramic layer with the thickness of 50 μm could be coated to a Ti cylindrical rod at the low temperature as low as 135°C under the confining pressure of 40 MPa. Pull-out tests were conducted to obtain an estimate for the adhesion properties of the HA coating prepared by the double layered capsule method. The shear strength obtained from the pull-out tests was in the range of 4.0-5.5 MPa. It was also shown that the crack propagation occurred within the HA coating layer, not along the HA/Ti interface in the pull-out tests.

Original languageEnglish
Pages (from-to)647-650
Number of pages4
JournalKey Engineering Materials
Volume309-311 I
DOIs
Publication statusPublished - 2006 Jan 1

Keywords

  • Coating
  • Double layered capsule
  • Hydrothermal
  • Hydroxyapatite
  • Pull-out testing
  • Titanium

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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