ADHERENT GLASS-CERAMIC THIN LAYERS WITH BIOACTIVE POTENTIAL DEPOSITED BY MAGNETRON SPUTTERING TECHNIQUES

Bioglass coatings were prepared by RF magnetron sputtering techniques onto titanium substrates from a 45S5 Bioglass (R) powder target. Two working pressures were used: 0.16 Pa and respectively 0.45 Pa. The structures were investigated from morphological, compositional and structural point of view by FTIR and SEM-EDS. The best results in terms of target-substrate stoichiometric transfer and chemical composition were obtained for the higher argon pressure. In case of this pressure, the effect of heat-treatment in air at 700 degrees C/2h was further studied upon two types of structures: abrupt and with functional graded buffer layer. SEM characterizations revealed a better morphology without cracks or delaminations for the "graded" structures.