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

Le résumé fourni par la source

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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