Abstract
In this work, different composites (zircon-mullite, zirconia-mullite-zirconia, mullite-zirconia and alumina-zirconia-mullite) were developed by reactive sintering of a powder mixture of boehmite (AlOOH)) and zircon (ZrSiO)4. These powder mixtures were mixed and ground by ball milling and then pressed in cylindrical form. Finally, the green specimens were sintered in air during 2 hours between 1400?C and 1600?C, with a heating and cooling rate of 5?C/min. The dilatometric curves show that there are several microstructural transformations in these mixtures. X-rays diffraction spectra showed formation of several composites depending on the initial conditions (% of boehmite and zircon and sintering temperature). The micrographic observations of the samples confirmed the presence of various phases. <br><br><font color="red"><b> This article has been retracted. Link to the retraction <u><a href="http://dx.doi.org/10.2298/SOS150330002E">10.2298/SOS150330002E</a><u></b></font>
Highlights
Nowadays, the multiphase composites ceramic-ceramic have an important industrial and technological role [1]
During heating of boehmite and zircon mixture, two phenomena proceed simultaneously: the reaction between silica coming from the dissociation of zircon and alumina resulting from the boehmite transformation
An important shrinkage is observed beyond 1200°C, it is related to the zircon decomposition witch give tetragonal zirconia and silica
Summary
The multiphase composites ceramic-ceramic have an important industrial and technological role [1]. The Al2O3-SiO2-ZrO2 equilibrium diagram developed by Budnikov and Litvakovskii [2], suggests the existence of ternary compounds starting from these oxides. We note the existence of two binary compounds which are: mullite (3Al2O3.2SiO2) and Zircon (ZrSiO4). H. Belhouchet et al /Science of Sintering, 46 (2014) 291-306. The mullite ceramic has had and will continue to have a significant role in the development of traditional and advanced ceramics. Mullite is the only sTab. crystalline phase in the aluminosilicate system, under normal atmospheric pressure from ambient temperature up to elevated temperatures. Its chemical composition ranges from 3Al2O3-2SiO2 to approximately 2Al2O3-SiO2. Mullite exhibits a good mechanical behavior at high temperatures [3]
Sign-in/Register to view highlights & summary 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.
