Abstract
The effects of doping with VC and Cr3C2 (grain growth inhibitors, GGIs) on the microstructural characteristics and mechanical properties of WC–MgO compacts prepared by hot-pressing sintering were investigated. GGIs suppressed the rate of densification during isothermal and non-isothermal sintering, but eventually increased the sintered density with extended holding time. Microstructure observation results revealed that the grain growth of WC was significantly retarded, and the homogeneity of MgO particulate dispersion and particulate/matrix interfacial coherence were improved effectively with the addition of GGIs. Meanwhile, the activation energy for grain growth during isothermal sintering increased from 426.85 to 492.53kJ/mol, which is consistent with the inhibition mechanism of VC and/or Cr3C2. The mechanical properties (hardness, fracture toughness and flexural strength) of compacts were enhanced by adding 0.25wt.% VC and 0.25wt.% Cr3C2.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
