Othman, Nurul Syazwani
(2014)
Effect Of Different Binder On The Fabrication Of Porous Cordierite.
Masters thesis, Universiti Sains Malaysia.
Abstract
Porous cordierite was fabricated by using replication sponge method. Magnesium oxide (MgO), aluminium oxide (Al2O3) and silicon dioxide (SiO2) were used as raw material with addition of different types of binder. The binders used were sago starch, tapioca starch and polyvinyl alcohol (PVA). This study was focus on the effect of various binder addition with different percentage of binder used (0 wt%, 3 wt%, 5wt%, 8 wt% and 10wt%) in the production of porous cordierite using stoichiometric of cordierite (2MgO.2Al2O3.5SiO2). The sponge was impregnate into the feedstock of cordierite slurry and dried (80 °C for 24 hours) prior sintered at temperature 1350 °C for 2 hours. Thermal Gravimetric Analysis (TGA) was done to determine the burnt out temperature of binders and sponge. The viscosity of slurry was measured using viscometer. Density and porosity were obtained by using Archimedes method. Morphology of sintered sample was studied using Scanning Electron Microscope (SEM) and the compressive strength was obtained from compressive test. Characterization was done to observe the purity of cordierite through X-ray diffraction (XRD). XRD results show that, the samples produced were pure cordierite without presenting impurity. Viscosity analysis shows that, all the slurries added with binder have pseudoplastic flow behavior. Porous cordierite creates open cell with the interconnected skeleton, less fracture skeleton and well-defined skeleton causes from the thicker coating of slurry. Range of porosity obtained with addition of sago, tapioca and PVA were 85-92%, 84-89.5% and 82-88.9%, respectively. Range of compressive strength obtained were 0.23-0.29 MPa, 0.20-0.33 MPa and 0.25-0.39 MPa, respectively. Binder was not only assists in formation process and give strength, but also acts as pore forming agents. Results obtained from the study shows that the addition of different binder affects the properties of porous cordierite produced.
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