Enamelled coatings produced with low-alkaline bioactive glasses

摘要: Abstract Enamelling is a relatively easy and inexpensive technique to produce glass coatings. In this contribution, three different low-alkaline bioactive glasses, modified with Na 2 O and/or K for total alkaline content of 4.6 mol%, were enamelled on Ti6Al4V substrates potential orthopaedic applications. The glasses in powder form applied by means precipitation-based method thermally treated the 800–850 °C range; particular, enamelling temperature required obtain uniform coatings increased increasing amounts. SEM observation revealed that about 100 μm thick, crack-free interface metal substrate mediated development titanium oxides. Even if are characterised high crystallization temperature, underwent partial devitrification, especially presence O. However, crystalline species, such as wollastonite, was beneficial, new phases not only improved local mechanical properties (in terms Vickers microhardness, from 232.1 ± 76.8 HV O-modified coating 317.9 ± 48.8 one), but still preserved apatite-forming ability simulated body fluid.