Hydroxyapatite/hydroxyapatite-whisker composites without sintering additives: Mechanical properties and microstructural evolution

Wojciech Suchanek, Masatomo Yashima, Masato Kakihana, Masahiro Yoshimura

    Research output: Contribution to journalArticlepeer-review

    148 Citations (Scopus)

    Abstract

    Hydroxyapatite/0%-30% hydroxyapatite-whisker (HAp/0%-30%HAP(w)) composites have been fabricated by pressureless sintering, hot pressing, and hot isostaic pressing (HIP). Composites that were HIPed at 1000°-1100°C (2 h, 190 MPa) exhibited the best properties: relative densities of 97.0-99.5%. fracture toughness of 1.4-2.0 MPa··m1/2 (as compared with 1.0 MPa·m1/2 for the nonreinforced HAp matrix). Compressive pre-stressing and crack deflection contributed mostly to the increase of fracture toughness. Depending on processing conditions, grain growth in the HAp matrix and/or Rayleigh instability of the HAp whiskers were probably responsible for microstructural changes in the composites. The HAp/HAp(w) composites exhibited improved toughness, attaining the lower fracture-toughness limit of bone without a decrease of bioactivity and biocompatibillity.

    Original languageEnglish
    Pages (from-to)2805-2813
    Number of pages9
    JournalJournal of the American Ceramic Society
    Volume80
    Issue number11
    DOIs
    Publication statusPublished - 1997 Nov

    ASJC Scopus subject areas

    • Ceramics and Composites
    • Materials Chemistry

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