Manufacturing of nano mullite-silicon carbide filters by in situ reaction bonding |
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| Affiliation: | 1. School of science, Wuhan University of Technology, Wuhan 430070, China;2. Wuhan Institute of Marine Electric Propulsion, Wuhan 430064, China;3. State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China;1. CSIR, Central Glass and Ceramic Research Institute, CSIR, Kolkata, 700 032, West Bengal, India;2. Course of Chemical Engineering, University of RibeirãoPreto (UNAERP), 14096-900 RibeirãoPreto, SP, Brazil;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China;2. Department of Materials Science and Engineering, University of Connecticut, Storrs, CT06269, USA;3. CNRS, CEMHTI UPR3079, Univ. Orléans, Orléans, France;4. Ruitai Materials, Technology CO, LTD, Beijing, China;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. Institute of Thermal Engineering, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China;3. Technical University Bergakademie Freiberg, Institute for Ceramic, Glass- and Construction Materials, Agricolastraße 17, 09596 Freiberg, Germany |
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| Abstract: | In the present study, the effect of silica nanoparticles on the formation of nano-mullite phase for use in the manufacture of silicon carbide based ceramic foam filters has been investigated. Polyurethane foam filters were impregnated with nanosilica particles by slip casting. In this method, the effect of different percentages of nanosilica particles in the slurry on compressive strength, density and porosity of ceramic foam filters was investigated. The effect of silica nanoparticles on viscosity of slurry was studied using rheometric test. So, sample S15 was selected to proceed. For thermal treatment of ceramic foams, different sintering temperatures were investigated and the best temperature was reported at 1250 °C. Compressive strength results showed that with increasing nano-silica content, CCS increased. XRD results from the samples showed that the nano-mullite phase was formed at 1250 °C along with silicon carbide and alumina phases. Scanning electron microscope images (SEM) showed that the mullite phase was formed in nano-dimensions in ceramic foam bodies. The formation of mullite phase in the microstructure of the filters is one of the factors of strengthening and increased refractory characteristics. EDS analysis by the scanning electron microscopy of the filter which passed ductile iron melt showed that cast iron inclusions and impurities were mostly consisted from FeO, MnO, SiO2, Al2O3, MgO and CO, which were trapped inside the ceramic filter. |
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| Keywords: | Ceramic filter Nanoparticle Mullite Silicon carbide Cast iron |
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