Investigating the effect of SiO2–TiO2–CaO–Na2O–ZnO bioactive glass doped hydroxyapatite: characterisation and structural evaluation

• DOI: 10.1007/s10856-014-5215-3
• Publication Date: 2014-04-18T18:27:58Z
• Authors: Chokchai Yatongchai; Anthony W. Wren; Declan J. Curran; Stuart Hampshire; Mark R. Towler
• Keywords: Liquidus; Bioactive Glass

The effects of increasing bioactive glass additions, SiO2-TiO2-CaO-Na2O-ZnO up to 25 wt% in increments of 5 wt%, on the physical and mechanical properties of hydroxyapatite (HA) sintered at 900, 1000, 1100 and 1200 °C for 2 h was investigated. Increasing both the glass content and the temperature resulted in increased HA decomposition. This resulted in the formation of a number of bioactive phases. However the presence of the liquidus glass phase did not result in increased densification levels. At 1000 and 1100 °C the additions of 5 wt% glass resulted in a decrease in density which never recovered with increasing glass content. At 1200 °C a cyclic pattern resulted from increasing glass content. There was no direct relationship between strength and density with all samples experiencing no change or a decrease in strength with increasing glass content. Weibull statistics displayed no pattern with increasing glass content.