Effect of yttria-doping on mechanical properties of bovine hydroxyapatite (BHA)

GÜNDÜZ O., DAĞLILAR S., SALMAN S., EKREN N., Agathopoulos S., Oktar F. N.

JOURNAL OF COMPOSITE MATERIALS, vol.42, no.13, pp.1281-1287, 2008 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 42 Issue: 13
  • Publication Date: 2008
  • Doi Number: 10.1177/0021998308092196
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1281-1287
  • Yıldız Technical University Affiliated: Yes


Sintered bodies of hydroxyapatite, derived from calcinated bovine bone (BHA) and doped with 0.5 and 1wt% Y2O3, were prepared. Measurements of density, compression strength, and microhardness, along with scanning electron microscopy (SEM) and X-ray diffraction (XRD) were carried out. The experimental results showed that BHA doping with yttria favors formation of glassy phase, which advances sintering and results in a dense and reinforced BHA matrix. The best mechanical properties were achieved after sintering at 1200 degrees C for compressive strength (82 MPa) and 1300 degrees C for microhardness (672 HV). These results are better than pure BHA or composites of hydroxyapatite with Y2O3-stablized zirconia, qualifying yttria (as dopant of BHA) for further in vitro and in vivo experimentation.