Hydroxyapatite ceramics with tetragonal zirconia particles dispersion prepared by HIP post-sintering

Koji Ioku, Shigeyuki Somiya, Masahiro Yoshimura

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Hydroxyapatite (HAp) powders with dispersed tetragonal zirconia particles were synthesized hydrothermally at 200°C under 2 MPa for 10 h. Transmission electron microscopy (TEM) demonstrated that the homogeneous mixture of ultra-fine HAp single crystals and zirconia particles could be obtained by the hydrothermal technique. The mixture with the volume ratio of HAp:zirconia=90:10 was hot-pressed at 1050°C under 30 MPa for 1 h in Ar, then post-sintered by HIP at the same temperature under 200 MPa of Ar for 1 h. The product had almost pore free microstructures consisting of HAp matrix and tetragonal zirconia particles. Its fracture toughness was 2.5 times as large as that of the transparent pure HAp ceramics. This ceramic was toughened by the crack deflection toughening mechanism and probably by the transformation toughening mechanism due to tetragonal zirconia particles dispersed in the matrix. Furthermore, the reactivity between HAp and zirconia was examined. The decomposition of HAp to β-tricalcium phosphate (β-TCP) was accelerated by zirconia, and CaO was not detected in every temperature. Thus the decomposition was taken place by dissolution of Ca components in zirconia in the first step, then HAp decomposed to β-TCP subsequently.

Original languageEnglish
Pages (from-to)196-203
Number of pages8
JournalNippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
Volume99
Issue number1147
DOIs
Publication statusPublished - 1991 Jan 1

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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