Journal
ADVANCES IN APPLIED CERAMICS
Volume 117, Issue 8, Pages 485-492Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/17436753.2018.1502063
Keywords
Alumina; sintering; solid state diffusion; microstructure; flexural strength
Categories
Funding
- Swiss Commission for Technology and Innovation (CTI)
Ask authors/readers for more resources
The aim of the present work was changing the surface properties of alumina ceramic via sintering of samples in spinel MgAl2O4 and magnesia MgO powder bed. During sintering nitrogen and air atmosphere were used; and the reference material was sintered at the same conditions but in an alumina powder bed. All samples were sintered to a density higher than 99.2% of theoretical density of alumina. In order to examine samples SEM, EDX and XRD (X-ray diffraction from 18 to 70 degrees 2 Theta) analysis were performed together with B3B flexural strength measurement. Results revealed that by sintering of alumina samples in a spinel powder bed pore-free surfaces were prepared, which had a favourable effect on B3B flexural strength. This was ascribed to the high solubility of Al3+ in spinel at sintering temperatures, which increases the sintering driving force. A further positive effect on B3B flexural strength was observed when samples were sintered in nitrogen instead of air.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available