Single-step sintering of zirconia ceramics using hydroxide precursors and Spark Plasma Sintering below 400 °C

SCRIPTA MATERIALIA

卷:168

Article

Elissalde, C.¹  Chung, U-C.¹  Josse, M.¹  Goglio, G.¹  Suchomel, M. R.¹  Majimel, J.¹  Weibel, A.²  Soubie, F.¹  Flaureau, A.²  Fregeac, A.²  Estournes, C.² 

[1] Univ Bordeaux, CNRS, UMR 5026, ICMCB, 87 Ave Dr A Schweitzer, F-33608 Pessac, France

[2] Univ Toulouse 3 Paul Sabatier, Univ Toulouse, CNRS, CIRIMAT, 118 Route Narbonne, F-31062 Toulouse 9, France

关键词: Spark Plasma Sintering;    Amorphous oxides precursors;    Nanostructured zirconia ceramics;    Polymorphic phase transformation;    Hardness;   

DOI  :  10.1016/j.scriptamat.2019.04.037

来源: Elsevier

【 摘 要 】

The densification of zirconia at very low temperatures (<400 degrees 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 degrees 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. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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