title: SiO2-CaO-K2O coatings on alumina and Ti6Al4V substrates for biomedical applications.
abstract: Alumina and Ti6Al4V alloys are widely used for orthopedics and dental applications due to their good mechanical properties and biocompatibility. Unfortunately they can not provide a satisfactory osteointegration when implanted. In fact, both alumina and Ti6Al4V are not bioactive and thus they can only guarantee a morphological fixation with the surrounding tissues without a suitable chemical anchorage. Aiming to impart bioactive properties to these materials a coating can be proposed. At this purpose, a bioactive glass belonging to the SiO2-CaO-K2O system was selected and prepared. This glass, named SCK, possess a thermal expansion coefficient matching with the alumina (8.5x 10(- 6)/ degrees C) and Ti6Al4V (9 x 10(- 6)/ degrees C) ones and thus is a good candidate to produce coatings on both of them. Simple and low-cost enameling and glazing techniques were used to realize the coatings. Structural, morphological and compositional characterizations of the coatings were carried out by means of X-ray diffraction, optical and scanning microscopy and compositional analyses. The in vitro properties of the coatings were investigated by soaking them in a simulated body fluid (SBF) in order to study the precipitation, on their surfaces, of a biologically active layer of hydroxylapatite (HAp).
authors.affiliation: Materials Science and Chemical Engineering Department, Polytechnic of Torino, C.so Duca degli Abruzzi 24, 10129, Torino, Italy. chiara.vitale@polito.it
authors.forename: C
authors.initials: C
authors.lastname: Vitale-Brovarone
authors.forename: E
authors.initials: E
authors.lastname: Verné
mesh_terms: D000497:Alloys; D000537:Aluminum Oxide; D001826:Body Fluids / Q000737:chemistry; D017610:Calcium Compounds / Q000737:chemistry; D011232:Chemical Precipitation; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D017886:Durapatite / Q000737:chemistry; D005898:Glass / Q000737:chemistry*; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D010087:Oxides / Q000737:chemistry; D017680:Potassium Compounds / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D013499:Surface Properties; D014025:Titanium; D014961:X-Ray Diffraction
chemical_list: D000497:Alloys; D017610:Calcium Compounds; D020099:Coated Materials, Biocompatible; D010087:Oxides; D017680:Potassium Compounds; C031462:titanium alloy (TiAl6V4); C068440:potassium oxide; D012822:Silicon Dioxide; D017886:Durapatite; C016538:lime; D014025:Titanium; D000537:Aluminum Oxide