Particles Size Effect on Thermo-Mechanical Properties of Ceramic Structures

John Wanjala, Andras Sapi, Imre Szenti, Tamas Boldizsar, Gabor Koszma

Department of Applied and Environmental Chemistry, University of Szeged, H-6720 Szeged, Rerrich Bela ter 1, Hungary.

In this work, we report the effect of particle size on thermomechanical properties of ceramic structures. SiC was utilized as the experimental feed material. The milling conditions were optimized to tune precise particle size. WC Ball to SiC weight ratio of 10:1 and ≈40% milling jar feed occupancy by volume were kept at a constant. The XRD analysis of milled samples showed that increasing milling speed increased rate of crystal size reduction, amorphization and lattice strain. Optimizing milling conditions led to synthesis of SiC particle in macro, micro, submicron and nano size. Particles milled at 100 and 150rpm were smooth with rounded edges while particles milled above 200 rpm were angular with rough morphology. The variation of particle size in cordierite ceramic structures led to improved thermomechanical properties in ceramics. 15% 200rpm1hr milled SiC ≈1µm resulted to significant improvement of % apparent porosity and bulk density of 12.4% and 1.99 compared to 25.05% and 1.98 samples without SiC respectively. The XRD analysis of SiC laced ceramic samples showed presence of characteristic 2ƟO SiC peaks at ≈35.8, 41, 60 and 70. The enhancement of % apparent porosity and bulk density were attributed to SiC particle size.

Keywords: Ball Milling; Particle Size Milling; Apparent Porosity; Bulk Density, XRD



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