Microstructure-designed Hydroxyapatite Ceramics Prepared by Hydrothermal Hot-Pressing

  • Koji Ioku
  • Tokio Kai
  • Mamoru Nishioka
  • Kazumichi Yanagisawa
  • Nakamichi Yamasaki

Abstract

Microstructure-designed hydroxyapatite ceramics, i.e. dense ceramics and porous ceramics, were prepared by hot-pressing under hydrothermal conditions. Fully dense hydroxyapatite ceramics could be obtained from ultra-fine hydroxyapatite single crystals by sintering at 1050 °C for 3h in air, after hydrothermal hot-pressing at 300°C under 30MPa of mechanical pressing for 2h. This ceramics had homogeneous grain size of about 0. 5μm with few pores. Porous hydroxyapatite ceramics with 42% porosity, about 300μm pores in diameter, was prepared from mixture of Ca(0H)2 and (NH4) 2HP04 by sintering at 1050°C for 3h in air, after hydrothermal hot-pressing at 300 °C under 30MPa of mechanical pressing for 2h. This ceramics had comparable compressive strength of 150 ± 20MPa to that of cortical bone.

Keywords

Compressive Strength Hydrothermal Condition Porous Ceramic Hydroxyapatite Ceramic Ceramic Prepare 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Elsevier Science Publishers Ltd. 1990

Authors and Affiliations

  • Koji Ioku
    • 1
  • Tokio Kai
    • 1
  • Mamoru Nishioka
    • 1
  • Kazumichi Yanagisawa
    • 1
  • Nakamichi Yamasaki
    • 1
  1. 1.Res. Lab. Hydrothermal Chemistry, Faculty of ScienceKochi UniversityKochiJapan

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