The effect of 3mol% Y 2O 3 stabilized ZrO 2 produced by a steric entrapment method on the mechanical and sintering properties of Cr 3C 2 based cermets

Ali Özer, Waltraud M. Kriven, Yahya Kemal Tür

Research output: Contribution to journalArticlepeer-review

Abstract

The aim of the study was to increase the toughness and strength of the Cr 3C 2 based cermets without compromising other mechanical properties by reinforcing Cr 3C 2-NiCr with yttria stabilized tetragonal zirconia particles (3Y-TZP). The TZPs were produced by a steric entrapment process. Cr 3C 2-NiCr (master) and 2wt% 3Y-TZP reinforced Cr 3C 2-NiCr "73C2Z3" cermets were sintered and the sintering kinetics and resulting mechanical properties were determined. The master cermets were sintered to 97% of theoretical density at 1350°C while 73C2Z3 cermets achieved a relative density of 98.5% even at 1300°C. Elastic modulus, transverse rapture strength, hardness, and fracture toughness values were measured. For the master cermets, all mechanical properties showed an increasing trend by increasing the sintering temperature to 1350°C. On the other hand, the mechanical properties of 73C2Z3 cermets reached maximum or near maximum values at 1300°C. Moreover, 73C2Z3 cermets had higher strength and fracture toughness compared to that of the master cermets and this observation was attributed to smaller carbide grains, a homogeneous 3-D network structure of Ni-Cr metal binder phase and a good distribution of fine 3Y-TZPs.

Original languageEnglish (US)
Pages (from-to)878-884
Number of pages7
JournalMaterials Science and Engineering A
Volume556
DOIs
StatePublished - Oct 30 2012

Keywords

  • 3Y-TZP
  • Carbides
  • Cermet
  • Fracture
  • SEM
  • Sintering

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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