Article Dans Une Revue Journal of the European Ceramic Society Année : 2025

Cold sintering of zirconia and yttria-stabilized zirconia from reactive hydroxides precursors

Résumé

Cold Sintering Process (CSP) allows low-temperature densification of various materials but may be limited by low chemical solubility and/or incongruent dissolution in complex oxides. For zirconia and yttria-stabilized zirconia (YSZ), both issues are evident. Avenues are explored to reduce their impact during CSP. Hydroxide precursors of zirconium (Zr(OH)₄) and yttrium (YOOH) are used to achieve dense zirconia and YSZ ceramics via reactive CSP. Starting from Zr(OH)₄, a monoclinic zirconia ceramic with 83 % density and Vickers hardness of 6.5 GPa was achieved using nitric acid at 500°C and 650 MPa. Yttria-stabilized zirconia ceramic (3YSZ) was obtained by reactive CSP with nitric acid at 400°C and 450 MPa, achieving a tetragonal phase up to 72 wt% and a relative density of 76 %. The impact of the experimental parameters on densification and structural characteristics is discussed. The results reveal a trade-off between densification and tetragonal phase stabilization for CSP sintering.

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hal-05157441 , version 1 (18-07-2025)

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Yoan Denis, Gilles Philippot, Erica Roitero, Graziella Goglio, Matthew R. Suchomel, et al.. Cold sintering of zirconia and yttria-stabilized zirconia from reactive hydroxides precursors. Journal of the European Ceramic Society, 2025, 45 (16), pp.117650. ⟨10.1016/J.JEURCERAMSOC.2025.117650⟩. ⟨hal-05157441⟩
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