Characteristics of bioactive glass coatings obtained by pulsed laser deposition

A type of bioglass (named Mg10) formed by the substitution of 10wt%Na2O with MgO in Bioglass® 45S5 was designed and coated on the substrate Ti6Al4V by pulsed laser deposition (PLD) technique. Scratch test results show that the bonding strength of Mg10 coating with the substrate is higher than that of 45S5 coating. The reason is that the thermal expansion coefficient of Mg10 matches that of Ti6Al4V more than that of 45S5. The in vitro behavior of the Mg10 bioglass coatings is similar to that of 45S5 bioglass coatings and follows the bioactive mechanism. The bioactivity level of Mg10 coating is lower than that of 45S5 coating. This could be attributed to the addition of Mg in Mg10, as part of Mg ions in the bioglass become network former, which decreases the Si‐O‐NBO/Si‐O‐Si (s) intensity ratio of the Mg10 coating. Therefore, substitution of 10wt%Na2O with MgO on the base of Bioglass® 45S5 coatings can improve their long‐term stability while maintaining a good biological response. Copyright © 2008 John Wiley & Sons, Ltd.