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.
|Number of pages||9|
|Journal||Journal of the American Ceramic Society|
|Publication status||Published - 1997 Jan 1|
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry