Key role of processing to avoid low temperature ageing in alumina zirconia composites for orthopaedic application

Gutknecht, Dan; Chevalier, Jérôme; Garnier, Vincent; Fantozzi, Gilbert

doi:10.1016/j.jeurceramsoc.2006.04.123

Cited by 85 publications

(63 citation statements)

References 20 publications

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“…In particular, zirconia-toughened alumina (ZTA) with low zirconia content as second phase (<15 vol%) shows higher fracture toughness and hardness than alumina and YTZP, respectively [2,[10][11][12][13][14]. However, YTZP as second phase in ZTA composites is under tension [14], so it is still liable to ageing in contact with wet environments [2,10,13], although significant resistance to ageing may be achieved [2]. Another design strategy, for improving the surface hardness of YTZP materials while avoiding the problem related to phase transformation, is to produce laminated structures designed to induce compressive residual stresses at the surface by combining ceramics with different thermal expansion coefficients.…”

Section: Introductionmentioning

confidence: 99%

Processing, nanoindentation and scratch testing of alumina-coated YTZP

Valle

Anglada

Ferrari

et al. 2015

Boletín de la Sociedad Española de Cerámica y Vidrio

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Available online xxxKeywords: Alumina YTZP Coatings Nanoindentation Scratch a b s t r a c t In this work, alumina-coated YTZP materials are proposed as means to combine the mechanical reliability of YTZP with the stiffness and hardness of alumina. Additionally, compressive stresses are developed in the alumina coating when cooling from the sintering temperature due to the thermal expansion mismatch between alumina and YTZP. The proposed processing method involves dipping of pre-sintered YTZP specimens in stable alumina suspensions and co-sintering of the dipped specimens. The influence of the processing parameters on the macro and microstructure of the materials has been established. Berkovich indentation has been performed to determine the Young's modulus of the substrates and coatings. The structural integrity of the coatings has been analysed using scratch tests. The Young's modulus. The optimised specimens present high resistance to scratch up to loads of 150 N. © 2015 Published by Elsevier España, S.L.U. on behalf of SECV. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Procesamiento y nano indentación y pruebas de nanoscratch de materiales YTZP recubiertos de alúmina Palabras clave:Alúmina YTZP Recubrimientos Nanoindentación Rayado r e s u m e n En este trabajo, se proponen los materiales YTZP recubiertos de alúmina como instrumento para combinar la fiabilidad mecánica de YTZP, con la rigidez y la dureza de alúmina. Adicionalmente, con este diseño, el material cerámico se ve reforzado por las tensiones residuales de compresión que aparecen en el recubrimiento de alúmina durante el enfriamiento desde la temperatura de sinterización, debido a la diferencia en coeficientes de expansión térmica entre la alúmina y la YTZP.El método de procesamiento propuesto implica la inmersión de muestras de YTZP presinterizadas, con un 42% de porosidad abierta, en suspensiones de alúmina estables, y la posterior co-sinterización de los materiales recubiertos.En este trabajo se ha establecido la influencia de los parámetros de procesamiento en la macro y microestructura de los materiales. Así mismo, se ha determinado el módulo de

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Section: Introductionmentioning

confidence: 99%

Processing, nanoindentation and scratch testing of alumina-coated YTZP

Valle

Anglada

Ferrari

et al. 2015

Boletín de la Sociedad Española de Cerámica y Vidrio

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“…In particular, zirconia-toughened alumina (ZTA) materials with low zirconia contents as second phase (<15 vol.%) show higher fracture toughness than the alumina single phase while maintaining the high hardness [2,[10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…However, in ZTA monolithic composites the latent possibility of transformation of the zirconia phase, possibility that continues to be extremely dependent on environmental conditions and on microstructural features determined by the manufacturing processes, is not prevented [2,10,13], even though significant microstructural advances to limit ageing have been achieved [2].…”

Section: Introductionmentioning

confidence: 99%

Processing of alumina-coated tetragonal zirconia materials and their response to sliding wear

Bueno

Ferrari

Melandri

et al. 2010

Ceramics International

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“…ZTA has attracted interest and extensive research due to a combination of high fracture toughness and wear and corrosion resistance. It finds applications in cutting tools [9][10][11], implants and dentistry [12,13].…”

Section: Introductionmentioning

confidence: 99%

Incorporation of zirconia nanoparticles into coatings formed on aluminium by AC plasma electrolytic oxidation

et al. 2008

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Composite ceramic coatings were formed on aluminium by AC plasma electrolytic oxidation (PEO) using Na 6 P 6 O 18 or Na 2 SiO 3 Á 5H 2 O/KOH electrolytes with monoclinic zirconia nanoparticles in suspension. The coatings grown in Na 2 SiO 3 Á 5H 2 O/KOH electrolyte revealed c-Al 2 O 3 and amorphous phase; a-Al 2 O 3 and AlPO 4 were additionally produced with the Na 6 P 6 O 18 electrolyte. Higher temperature zirconia phases, possibly tetragonal and orthorhombic, in addition to the monoclinic phase, were indicative of elevated temperatures at sites of microdischarges. Further, local melting resulted in zirconium-rich dendrites in the coating formed in silicate electrolyte. Zirconium was mainly located in the relatively compact, outer layer of the coating, constituting *70-90% of the coating thickness. Nanoparticles appeared to be incorporated at the coating surface and following transport to the interface regions between the inner and outer layers along short-circuit paths through the outer coating.

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Key role of processing to avoid low temperature ageing in alumina zirconia composites for orthopaedic application

Cited by 85 publications

References 20 publications

Processing, nanoindentation and scratch testing of alumina-coated YTZP

Processing, nanoindentation and scratch testing of alumina-coated YTZP

Processing of alumina-coated tetragonal zirconia materials and their response to sliding wear

Incorporation of zirconia nanoparticles into coatings formed on aluminium by AC plasma electrolytic oxidation

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