Microstructure-designed Hydroxyapatite Ceramics Prepared by Hydrothermal Hot-Pressing

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


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.


Compressive Strength Hydrothermal Condition Porous Ceramic Hydroxyapatite Ceramic Ceramic Prepare 
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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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