Bioactive hydroxyapatite/calcium silicate composites obtained by fast hot pressing: Structure and flexural strength

Simone Sprio, Anna Tampieri, Elena Landi, Giancarlo Celotti, Daniele Dalle Fabbriche

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

The present work deals with the preparation and characterization of ceramic composites for the substitution of load-bearing bone portions, made of hydroxyapatite (HA) and bioactive β-calcium silicate (β-Ca 2SiO4) as a reinforcing phase. The composite materials were prepared by Fast Hot-Pressing technique (FHP), which allowed the rapid sintering of monolithic ceramics at temperatures up to 1500°C, well above the commonly adopted temperatures for sintering of hydroxyapatite (1200-1300°C), in order to achieve the densification of the reinforcing phase also. XRD analysis reported no formation of secondary phases other than HA and β-Ca2SiO4, after FHP cycles. Flexural strength tests were performed on selected samples sintered at different temperatures: the composite materials exhibited increased mechanical resistance compared to samples constituted of HA only. These preliminary results confirmed that composites of HA and β-Ca2SiO4 are promising for the development of bioactive load-bearing ceramic bone substitutes.

Original languageEnglish (US)
Pages (from-to)423-426
Number of pages4
JournalKey Engineering Materials
Volume361-363 I
StatePublished - 2008

Keywords

  • Calcium silicate
  • Composite
  • Flexural strength
  • Hot-pressing
  • Hydroxyapatite

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemical Engineering (miscellaneous)

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