Enhancing stability of Co gradient in nano-structured WC-Co functionally graded composites using graphene additives

Ali Nasser, Kazunari Shinagawa, Hassan El-Hofy, Ahmed A. Moneim

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


A new approach for stabilizing a predesigned Co gradient in the microstructure of nano WC-Co thinning structure via graphene additions is presented. For this purpose, laminated specimens of green WC-Co functionally graded material, having three layers structured, with and without graphene additions in the intermediate layer were sintered at solid and liquid sintering temperatures of 1290 and 1400°C, respectively, using the hot isostatic pressing technique (HIP). With graphene additions, the mean average grain size of WC matrix phase is reduced, a new inter-phase layer is created and the amplitude of predesigned Co gradient, which had lost during liquid phase sintering of graphene-free WC-Co composite, is maintained through the cross section of the predesigned structure. As a consequence, the liquid state sintered specimens containing graphene show better hardness to toughness relationships compared to the graphene-free specimens fabricated under the same processing conditions. Such improvements are attributed to the extraordinary thermo-mechanical properties of graphene, and its beneficial role in grain refinement and creation of inter-phase layer that enables the stabilization of the predesigned Co-gradient.

Original languageEnglish
Pages (from-to)1191-1198
Number of pages8
JournalJournal of the Ceramic Society of Japan
Issue number12
Publication statusPublished - Dec 2016

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry


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