Pulsed electric current sintered Cr2O3-rGO composites

M. Erkin Cura, Vivek Kumar Singh, Panu Viitaharju, Joonas Lehtonen, Simo Pekka Hannula*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

1 Citation (Scopus)


Chromium oxide is a promising material for applications where excellent corrosion resistance, high hardness, and high wear resistance are needed. However, its use is limited because of low fracture toughness. Improvement of fracture toughness of chromium oxide while maintaining its afore mentioned key properties is therefore of high interest. In this communication we study the possibility of increasing the toughness of pulsed electric current sintered (PECS) chromium oxide by the addition of graphene oxide (GO). The indentation fracture toughness was improved markedly with the addition of graphene oxide. Materials prepared by direct chemical homogenization had better fracture toughness. In composites with 10 vol.% GO piling of thin graphene oxide layers resulted in the formation of graphite layers between Cr2O3 and in carbide formation, which were observed to be the main reasons for the degradation of the mechanical properties. The distribution of graphene oxide was more homogeneous, when the GO amount was 0.1 vol.% and the formation of graphitic layers were avoided due to lesser amount of GO as well as ultrasonic treatment following the ball milling.

Original languageEnglish
Title of host publicationEngineering Materials and Tribology XXV
EditorsDagnija Loca
PublisherTrans Tech Publications
Number of pages6
ISBN (Print)9783035710724
Publication statusPublished - 2017
MoE publication typeA4 Conference publication
EventInternational Baltic Conference of Engineering Materials and Tribology - Riga, Latvia
Duration: 3 Nov 20164 Nov 2016
Conference number: 25

Publication series

NameKey Engineering Materials
Volume721 KEM
ISSN (Print)10139826


ConferenceInternational Baltic Conference of Engineering Materials and Tribology
Abbreviated titleBALTMATTRIB


  • Chromium oxide
  • Fracture toughness
  • Graphene oxide
  • Hardness
  • Pulsed electric current sintering (PECS)


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