Near-net shape manufacture of B4C–Co and ZrC–Co composites by slip casting and pressureless sintering

Angel L. Ortiz, Victor Manuel Candelario Leal, Rodrigo Moreno, Fernando Guiberteau

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Abstract

Fabrication of near-net shaped B4C–Co and ZrC–Co composites by slip casting and pressureless sintering is described. It is shown how B4C–Co and ZrC–Co concentrated suspensions can be prepared by aqueous colloidal processing, and optimized (in terms of pH, deflocculant contents, and sonication time) to have a shear-thinning rheological behaviour suitable for the near-net shaping of the corresponding cermet compacts by slip casting. It is also demonstrated that the robust, highly-dense compacts so obtained have a uniform green microstructure without macro-defects or gradient density, and which can be fully densified by pressureless sintering. Specifically, it is shown that B4C–Co compacts densify by reactive and transient liquid-phase sintering, thus resulting in multi-component ceramics. ZrC–Co compacts densify however by persistent liquid-phase sintering, thus resulting in cermets. An explanation is given for these observations, and general implications are discussed for the near-net shape manufacture of these and similar carbide-metal composites for use in engineering applications.
Original languageEnglish
JournalJournal of the European Ceramic Society
Volume37
Issue number15
Pages (from-to)4577-4584
ISSN0955-2219
DOIs
Publication statusPublished - 2017

Keywords

  • Cermets
  • B4C
  • ZrC
  • Colloidal processing
  • Pressureless sintering

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