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Thermal stability in air of surface nitrided 3Y-TZP
Valle Chiro, Jorge Antonio; Mestra Rodríguez, Álvaro Miguel; Anglada Gomila, Marcos Juan
Universitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica; Universitat Politècnica de Catalunya. CIEFMA - Centre d'Integritat Estructural i Fiabilitat dels Materials
Surface nitriding can be optimised to protect 3Y-TZP against hydrothermal degradation and at the same time to keep the mechanical properties of the surface and the bulk unchanged. However, thermal stability is a concern that can limit its use above room temperature. In this work, surface nitrided 3Y-TZP was heat treated in air at 200, 400, 600 and 800◦C for 8 h. Treatments up to 600◦C did not change microstructure and Vickers hardness, but heating at 800◦C produced surface defects, inner cracks and grain decohesion, conducing to a dramatic decrease in mechanical strength. Heat treatments above 400◦C led to an increase of indentation fracture toughness and to a complete loss of the hydrothermal degradation resistance achieved by nitriding.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria dels materials::Materials ceràmics
3Y-TZP materials
Zirconia doped with yttria
Zirconia
ZrO2
Surfaces
Thermal properties
Mechanical properties
Zircó
info:eu-repo/semantics/publishedVersion
Article
Elsevier
         

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