Investigating the effect of SPRM on mechanical strength and thermal conductivity of highly porous alumina ceramics |
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| Affiliation: | 1. Faculty of Exact Science, Physics Department, Ceramics Lab., Constantine University 1, Constantine 25000, Algeria;2. Faculty of Exact Science, Physics Department, Laboratory of Condensed Matter Physics and Nanomaterials, Jijel University 18000, Algeria;3. Laboratoire d’étude des matériaux, Jijel University 18000, Algeria;4. Institute on Membrane Technology, ITM-CNR, via P. Bucci, cubo 17/C, 87030 Rende, CS, Italy;5. Dipartimento di Fisica, Università della Calabria, Ponte P. Bucci, 87036, Cubo 31C, Arcavacata di Rende, CS, Italy;6. Consiglio Nazionale Interuniversitario Scienze Fisiche della Materia (C.N.I.S.M), Via della Vasca Navale, 84, 00146 Roma, Italy;7. Consiglio Nazionale delle Ricerche, Istituto di Nanotecnologia (Nanotec) – UoS Cosenza, Ponte P. Bucci, 87036, Cubo 31C, Arcavacata di Rende, CS, Italy;1. Electron Microscopy for Materials Science (EMAT), University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium;2. Centre for Surface Chemistry and Catalysis, KU Leuven, Celestijnenlaan 200F, Bus 2461, B-3001 Heverlee, Belgium;1. Faculty of Materials & Metallurgical Engineering, Semnan University, Semnan, Iran;2. Department of Materials Engineering, Shahr-e Kord, Iran;3. Department of Materials Engineering, Faculty of Engineering, Malayer University, Malayer, Iran |
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| Abstract: | For recycling waste refractory materials in metallurgical industry, porous alumina ceramics were prepared via pore forming agent method from α-Al2O3 powder and slide plate renewable material. Effects of slide plate renewable material (SPRM) on densification, mechanical strength, thermal conductivity, phase composition and microstructure of the porous alumina ceramics were investigated. The results showed that SPRM effectively affected physical and thermal properties of the porous ceramics. With the increase of SPRM, apparent porosity of the ceramic materials firstly increased and then decreased, which brought an opposite change for the bulk density and thermal conductivity values, whereas the bending strength didn’t decrease obviously. The optimum sample A2 with 50 wt% SPRM introducing sintered at 1500 °C obtained the best properties. The water absorption, apparent porosity, bulk density, bending strength and thermal conductivity of the sample were 31.7%, 62.8%, 1.71 g/cm3, 47.1 ± 3.7 MPa and 1.73 W/m K, respectively. XRD analysis indicated that a small quantity of silicon carbide and graphite in SPRM have been oxidized to SiO2 during the firing process, resulting in rising the porous microstructures. SEM micrographs illustrated that rod-like mullite grains combined with plate-like corundum grains to endow the samples with high bending strength. This study was intended to confirm the preparation of porous alumina ceramics with high porosity, good mechanical properties and low thermal conductivity by using SPRM as pore forming additive. |
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| Keywords: | Porous alumina ceramics Slide plate renewable material Apparent porosity Bending strength Thermal conductivity |
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