Surface coatings of bioactive glasses on high strength ceramic composites

Dense and ultrafine alumina–zirconia composites (Al 2O 3–16 wt%ZrO 2 and ZrO 2–20 wt%Al 2O 3) are developed and characterized for load bearing prosthetic applications. The improvement of the ceramic/bone interface, namely of the ceramic bioactivity, is performed by a glass coating on the surface of...

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Veröffentlicht in:Applied surface science 2009-04, Vol.255 (13), p.6679-6685
Hauptverfasser: Martorana, S., Fedele, A., Mazzocchi, M., Bellosi, A.
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Sprache:eng
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Zusammenfassung:Dense and ultrafine alumina–zirconia composites (Al 2O 3–16 wt%ZrO 2 and ZrO 2–20 wt%Al 2O 3) are developed and characterized for load bearing prosthetic applications. The improvement of the ceramic/bone interface, namely of the ceramic bioactivity, is performed by a glass coating on the surface of the composites. A new composition is used to produce the glass powder, by melting at 1550 °C the mixture of oxide raw materials. The processing to obtain a homogeneous and adherent coating on the ceramic substrates is investigated: the optimal temperature for the glazing treatment is 1200 °C. The microstructure of the coating and of the ceramic/coating interface, the adhesion and some mechanical properties of the prepared glass and of the coating are analyzed. Besides, the in vitro bioactive responses, by incubation of osteoblast-like cells on the coated samples, are evaluated: positive results are confirmed after 24 h and 72 h.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2009.02.069