Development of hydroxyapatite ceramics with tailored pore structure

The porosity of a hydroxyapatite ceramic was tailored by transferring polymeric pore models into ceramic forms via the slip casting technique. The rheological properties of the hydroxyapatite slurries play an important role in facilitating the casting operation. The optimised slurry with a solids co...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Key engineering materials 2004-01, Vol.254-256, p.977-980
Hauptverfasser: Deisinger, U, Stenzel, F, Ziegler, G
Format: Artikel
Sprache:eng
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:The porosity of a hydroxyapatite ceramic was tailored by transferring polymeric pore models into ceramic forms via the slip casting technique. The rheological properties of the hydroxyapatite slurries play an important role in facilitating the casting operation. The optimised slurry with a solids content of 60 wt% hydroxyapatite had a slight shear thickening flow behaviour and a low viscosity. Via impregnating of polymeric pore models and dip coating of polymeric foams ceramic green bodies were fabricated. After sintering at 1250DGC the polymer was burnt out and a porous ceramic was achieved. This porous ceramic could be reasonably handled and had a very high interconnecting porosity of 91-96 vol%. The pore size varied between 300 and 800 *mm. The density value of the bulk hydroxyapatite ceramic covered the range between 94 and 96% th.d. The characteristics of the porous ceramics could be varied between high and undirected porosity on the one hand, and lower porosity with defined pore channels in the three dimensional directions on the other hand.
ISSN:1013-9826