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- W230840420 abstract "Zirconia doped with 3% molar of yttria (3Y-TZP) has been widely used in the manufacturingof medical implants during the last decades, especially thanks to its unique balance oftoughness and strength. At room temperature, these properties are mostly related totoughening by the stress assisted transformation of the metastable tetragonal phase intostable monoclinic one in front of a crack tip under stress. This transformation is accompaniedby a volume expansion of 5%, which contributes to prevent material failure by reducing crackpropagation and increasing toughness.The weak point of 3Y-TZP resides in its environmental sensibility. Indeed, it is prone to LowTemperature Degradation (LTD), an ageing phenomenon which occurs under humidatmosphere at relatively low temperatures, being faster around 200°C.Therefore, this project consists in designing a novel methodology for LTD prevention throughCerium infiltration into pre-sintered 3Y-TZP porous blanks prior to sintering. The purpose is tolimit the treatment to superficial regions in order to increase the resistance to LTD withoutaffecting significantly the initial mechanical properties. The control of the infiltration isperformed on specimens by adjusting three parameters: solution viscosity, immersion timeand penetration mechanism (by diffusion or capillarity).Cerium infiltration appears efficient in regard to LTD prevention, since it is shown that itprevents degradation after 30h of artificial ageing. Besides, the influence of Cerium onmechanical properties, such as hardness and fracture toughness, is determined by theamount and penetration depth of Cerium in 3Y-TZP. By using short immersion times, highsolution viscosities and diffusive penetration mechanisms, the mechanical properties of 3YTZPare maintained, without significant reduction on hardness or fracture toughness.Finally, it is proposed another new method to prevent LTD which is based on Ceriuminfiltration in combination with sandblasting." @default.
- W230840420 created "2016-06-24" @default.
- W230840420 creator A5005423925 @default.
- W230840420 date "2013-02-01" @default.
- W230840420 modified "2023-09-23" @default.
- W230840420 title "Surface Modification of Zirconia for dental implants" @default.
- W230840420 hasPublicationYear "2013" @default.
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