Effect of the addition ZrO@d2-Al@d2O@d3 on nanocrystalline hydroxyapatite bending strength and fracture toughness

• Published in: Ceramics international Vol. 35; no. 4; pp. 1569 - 1574
• Main Authors: Mobasherpour, I, Solati Hashjin, M, Razavi Toosi, S.S., Darvishi Kamachali, R.
• Format: Journal Article
• Language: English
• Published: 01.05.2009
• DOI: 10.1016/j.ceramint.2008.08.017
• ISSN: 0272-8842

Nanocrystalline hydroxyapatite powder has been synthesized from a Ca(NO@d3)@d2.4H@d2O and (NH@d4)@d2HPO@d4 solution by the precipitation method. In the next step we prepared ZrO@d2-Al@d2O@d3 powder. After preparation, the powder was dried at 80@uoC and calcined at 1200@uoC for 1h. Various amounts (HAP-15wt% ZA, HAP-30wt% ZA) of powder were mixed with the hydroxyapatite by ball milling. The powder mixtures were pressed and sintered at 1000@uoC, 1100@uoC and 1200@uoC for 1h. In order to study the structural evolution, X-ray diffraction (XRD) was used. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) were used to estimate the particle size of the powder and observe fracture surfaces. Results show that the bending strength of pressed nanocrystalline HAP was improved significantly by the addition 15wt% of ZrO@d2-Al@d2O@d3 powders at 1200@uoC, but the fracture toughness was not changed, however when 30wt% of ZA powders were added to nanocrystalline HAP, the bending strength and fracture toughness of the specimens decreased at all sintering temperature.