Abstract
The aim of this study was to improve the mechanical properties of porous corundum ceramics by adding various types of SiO2 source (SiO2, SiC and Si3N4), but at the same time retaining high porosity (at least 55%). Ceramics were fabricated by slip casting. Pores were formed using aluminium's reaction with water. It was found that the bending strength of the material can be improved and relatively high porosity retained by producing corundum–mullite composites. Addition of 3.7equivalent wt% of SiO2 source increased the bending strength by up to 250% in comparison with unmodified corundum ceramics. The apparent porosity decreased by up to ca. 8%. If the amount of SiO2 source was increased from 3.7equivalent wt% to 7.3equivalent wt%, the bending strength decreased. The best mechanical properties were achieved with samples that were modified with SiC and Si3N4 nanopowders. This is due to better dispersion in Al2O3 matrix.
Sign-in/Register to access full text options 
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.
