Superplasticity and creep in monoclinic and Y-PSZ nano-grained zirconia

Lifu Chen*, Tanguy Rouxel, Rachman Chaim, Hervé Vesteghem, Dov Sherman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A fine-grained partially stabilized tetragonal zirconia with an average grain size of about 100 nm, was prepared by Hot Isostatic Pressing of an ultrafine zirconia-yttria powder. For a given strain rate, the superplastic forming temperature (1150-1250°C) is lowered by 200°C in comparison with the standard Y-TZP materials. However, for testing temperatures below 1250°C, destabilization occurs, with a dramatic increase in the monoclinic content below 1170°C, as the tetragonal to monoclinic phase transformation takes place, in conjunction with microcracking. In the aim to overcome this difficulty, a pure monoclinic zirconia, with an average grain size of 80 nm, was prepared by hydrothermal synthesis of a monoclinic zirconia suspension. This material is stable below 1170°C, and allows to further decrease the plastic forming range down to about 1000-1100°C.

Original languageEnglish
Pages (from-to)245-250
Number of pages6
JournalMaterials Science Forum
Volume243-245
StatePublished - 1997
Externally publishedYes

Keywords

  • Ceramics
  • Nano-materials
  • Superplasticity
  • Zirconia

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