Abstract
The densification kinetics of zirconia-nickel composites, containing up to 30 vol% of nickel with a medium particle size around 4 μm, was investigated. Green 3 mol% yttria stabilized zirconia (3YSZ)/Ni compacts with 56% of the theoretical density were submitted to dilatometry at constant heating rates of 5, 10 and 20 °C/min. The densification kinetics of the ceramic-metal composites (cermets) were evaluated by estimation of the apparent activation energy (Q), whereas scanning electron microscopy was used to analyze the microstructure. The addition of nickel caused an increase of activation energy of densification of the composites. The densification behavior was influenced by microstructural evolution of nickel phase and percolation phenomenon. The values of activation energy for densification increased as a function of Ni content. In the initial stage, the activation energy varied from (485 ± 45) J.mol−1, for pure zirconia, to (683 ± 28) J.mol−1, for composites with ZrO2(70%vol)/Ni(30%vol), 70Z-30Ni. In the intermediate, these values increased from (343 ± 13) to (480 ± 30) J.mol−1, for pure zirconia and 70Z-30Ni, respectively.
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.
