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Non‐traditional methods for obtaining glasses for coatings: A raman and infrared vibrational study
Author(s) -
Bertoluzza A.,
Morelli M. A.,
Tinti A.,
Vasina M.
Publication year - 1994
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250250115
Subject(s) - raman spectroscopy , metaphosphate , materials science , coating , biocompatibility , ceramic , chemical engineering , infrared spectroscopy , stoichiometry , calcium , analytical chemistry (journal) , mineralogy , phosphate , nanotechnology , composite material , chemistry , metallurgy , organic chemistry , optics , physics , engineering
Synthetic methods which provide alternatives to the oxide melting method for the preparation of inorganic glasses are described. These methods were monitored by Raman spectroscopy. The transformation products involved in two main synthetic methods, the ‘sol–gel’ method illustrated here for obtaining glassy SiO 2 and the ‘polymeric’ route used for the first time in the preparation of calcium phosphate glasses (CaO.P 2 O 5 , calcium metaphosphate; xCaO.P 2 O 5 , calcium oligophosphates, where x ≤ 1.6) are characterized and discussed using their Raman spectra. These alternative methods allow vitreous materials to be prepared at moderate temperatures. They can therefore be important in the field of biomaterials for coating metal implants with bioactive glasses and ceramics. The melting method (for glasses) and the plasma spray technique (for ceramics) frequently induce changes of stoichiometry in the coating and also activation of the support material, metal or alloy, resulting in a lack of biocompatibility.