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Cold sintering process for ZrO 2 ‐based ceramics: significantly enhanced densification evolution in yttria‐doped ZrO 2
Author(s) -
Guo Hanzheng,
Guo Jing,
Baker Amanda,
Randall Clive A.
Publication year - 2017
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14593
Subject(s) - sintering , materials science , ceramic , cubic zirconia , yttria stabilized zirconia , vickers hardness test , annealing (glass) , tetragonal crystal system , monoclinic crystal system , composite material , doping , microstructure , metallurgy , phase (matter) , crystallography , optoelectronics , crystal structure , chemistry , organic chemistry
We recently developed a novel technique of cold sintering process ( CSP ) to obtain dense ceramics at extraordinarily low temperatures. In this communication, we demonstrate the feasibility of applying CSP to zirconia‐based ceramics. As exemplified by 3Y‐ TZP ceramics, a significantly enhanced densification evolution is observed. Water is simply utilized as a sintering aid to assist the ceramic densification under an applied external pressure. The low‐temperature advantage of CSP outstands in contrast to the densification curves compiled from other sintering techniques. A gradual monoclinic‐to‐tetragonal phase transformation is revealed in correspondence to the densification development, as well as contributes to the mechanical hardness evolution. A Vickers Hardness reaches ~10.5  GP a after annealing the cold‐sintered ceramics at 1100°C, which is comparable to those values reported in the previous studies at higher sintering temperatures. Such a sintering methodology is of significant importance as it provides a roadmap for cost‐effective processing of zirconia‐based ceramics and composites that enable broad practical applications.

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