Single-step sintering of zirconia ceramics using hydroxide precursors and Spark Plasma Sintering below 400 °C
Idioma
en
Article de revue
Este ítem está publicado en
Scripta Materialia. 2019-07, vol. 168, p. 134-138
Elsevier
Resumen en inglés
The densification of zirconia at very low temperatures (<400 °C) requires enhanced synergy between thermodynamics and kinetics. This work demonstrates an efficient single step approach combining amorphous hydrated zirconia ...Leer más >
The densification of zirconia at very low temperatures (<400 °C) requires enhanced synergy between thermodynamics and kinetics. This work demonstrates an efficient single step approach combining amorphous hydrated zirconia and Spark Plasma Sintering at 350 °C and 600 MPa. The resulting zirconia ceramics exhibit a cohesive nanostructure with small average grain sizes (20 nm) and a predominantly monoclinic structural polymorph confirmed by both X-ray scattering analyses and High Resolution Transmission Electronic Microscopy. Remarkable Vickers hardness of 3.8 GPa for high level of porosity (30%) is explained by the density and homogeneous distribution of grains boundaries and meso/microporosities.< Leer menos
Palabras clave en inglés
Amorphous oxides precursors
Nanostructured zirconia ceramics
Polymorphic phase transformation
Hardness
Spark plasma sintering
Orígen
Importado de HalCentros de investigación