Abstract
In order to improve the mechanical properties of pure mullite ceramics, a process has been developed that incorporates Zr(Y)O 2 into mullite by infiltrating partially reaction sintered (porous) mullite compacts with mixed ZrOCl 2·8H 2O and YCl 3·6H 2O solutions, corresponding to ZrO 2/Y 2O 3 = 97/3 (mol.%). The infiltration of small amount (∼7.2 wt.%) of Zr(Y)O 2 significantly improved the densification behavior and mechanical properties of mullite bodies sintered at 1620 °C, for 10 h. The mocrostructure contained a few elongated mullite crystals (aspect ratio > 6) which were embedded in a fine-grained matrix. The relatively large Zr(Y)O 2 inclusions were mainly dispersed intergranularly in the matrix, but small (<0.7 μm) inclusions were present in the grains. During sintering, the liquid phase having higher Al 2O 3 content than that of stoichiometric mullite composition formed at triple points of the mullite/mullite grains.
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.
