Publicado

2018-07-01

Electrochemical analysis of the degradation of nitrided zirconia 3Y-TZP

Análisis electroquímico de la degradación de circonia 3Y-TZP nitrurada

Palabras clave:

3Y-TZP, nitriding, aging, artificial saliva, EIS (en)
3Y-TZP, nitruración, envejecimiento, saliva artificial, EIE (es)

Autores/as

Zirconia is a material that is susceptible to changes in its structure from the tetragonal to the monoclinic phase caused by variations in temperature or by contact with water. One way of achieving the stability of the tetragonal phase at low temperatures is by incorporating anionic gaps in its crystal lattice through doping procedures with aliovalent anions such as nitrogen. Nitrogen replaces the oxygen in the crystal lattice, which stabilizes the tetragonal structure of zirconia at low temperatures. The aim of this research was to evaluate the degradation of nitrided zirconia 3Y-TZP after it was immersed in artificial saliva for 0, 7, 14, and 21 days. Interfacial processes such as oxide-formation were assessed simultaneously using the electrochemical impedance spectroscopy test. Additionally, morphological, topographic, and composition changes were analyzed in the degradation process using SEM-EDS and AFM.
La circonia es un material susceptible a cambios en su estructura de la fase tetragonal a monoclínica, ocasionados por cambios en la temperatura o contacto con agua. Una manera de alcanzar la estabilidad de la fase tetragonal a bajas temperaturas es a través de la incorporación de vacancias aniónicas en su estructura cristalina por medio de procedimientos de dopado con aniones aliovalentes como el nitrógeno. El nitrógeno reemplaza el oxígeno en la estructura cristalina y estabiliza la estructura tetragonal de la circonia a bajas temperaturas. El objetivo de este trabajo fue evaluar la degradación de la circonia 3Y-TZP nitrurada a través de su inmersión en saliva artificial por 0, 7,14 y 21 días, evaluando los procesos interfaciales como la formación de óxidos a través de espectroscopia por impedancia electroquímica. Adicionalmente se analizó la morfología, topografía y cambios de composición en el proceso de degradación empleando SEM-EDS y AFM.

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Citas

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