Single-step sintering of zirconia ceramics using hydroxide precursors and Spark Plasma Sintering below 400 °C. (15th July 2019)

• Record Type: Journal Article
• Authors: Elissalde, C.; Chung, U-C.; Josse, M.; Goglio, G.; Suchomel, M.R.; Majimel, J.; Weibel, A.; Soubie, F.; Flaureau, A.; Fregeac, A.; Estournès, C.
• Is Part Of: Scripta materialia. Number 168(2019)
• Page Start: 134
• Page End: 138
• Publication Date: 2019-07-15
• Subjects: Spark Plasma Sintering -- Amorphous oxides precursors -- Nanostructured zirconia ceramics -- Polymorphic phase transformation -- Hardness; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.04.037
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: 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. Graphical abstract: Unlabelled Image