Low-temperature ageing of zirconia-toughened alumina ceramics and its implication in biomedical implants

Changes in crystalline phases resulting from low-temperature ageing of different yttria doped and non-doped zirconia-toughened alumina composites and nanocomposites were investigated under controlled humidity and temperature conditions in autoclave. A classical powder mixing processing route and a new modified colloidal processing route were used to process the composites. Different compositions ranging from 2.5 wt.% zirconia in a matrix of alumina to pure zirconia (3Y-TZP) were studied. It was observed that Al2O3+yttria stabilised ZrO2 composites exhibited significant ageing. However, ageing was much slower than traditionally observed for Y-TZP ceramics, due to the presence of the alumina matrix. Ageing was clearly limited for zirconia content beyond 25 wt.%. On the other side of the spectrum, Al2O3+2.5 wt.% ZrO2 initially presented a monoclinic fraction but did not show any ageing degradation. These composites seem to represent the best choice between slow crack growth and ageing resistance. © 2003 Elsevier Ltd. All rights reserved.

Bibliographic Details

Main Authors:	Deville, Sylvain, Chevalier, Jérôme, Fantozzi, Gilbert, Bartolomé Gómez, José Florindo, Requena, Joaquín, Moya, J. S., Torrecillas, Ramón, Díaz, Luis A.
Other Authors:	European Commission
Format:	artículo biblioteca
Published:	Elsevier 2003
Subjects:	Ageing, Al2O3, Biomedical applications, Nanocomposites, ZrO2,
Online Access:	http://hdl.handle.net/10261/223494 http://dx.doi.org/10.13039/501100000780
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