Cold sintering process for ZrO2-based ceramics: significantly enhanced densification evolution in yttria-doped ZrO2

Hanzheng Guo, Jing Guo, Amanda Baker, Clive A. Randall

Research output: Contribution to journalArticlepeer-review

48 Scopus citations

Abstract

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 GPa 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.

Original languageEnglish (US)
Pages (from-to)491-495
Number of pages5
JournalJournal of the American Ceramic Society
Volume100
Issue number2
DOIs
StatePublished - Feb 1 2017

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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