Optimization of Sintering Process of Alumina Ceramics Using Response Surface Methodology

Darko Landek, Lidija Ćurković, Ivana Gabelica, Mihone Kerolli Mustafa and Irena Žmak
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Darko Landek: Department of Materials, Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Ivana Lučića 5, 10000 Zagreb, Croatia
Lidija Ćurković: Department of Materials, Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Ivana Lučića 5, 10000 Zagreb, Croatia
Ivana Gabelica: Department of Materials, Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Ivana Lučića 5, 10000 Zagreb, Croatia
Mihone Kerolli Mustafa: International Business College Mitrovica, Str. Bislim Bajgora nn, 40000 Mitrovica, Kosovo
Irena Žmak: Department of Materials, Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Ivana Lučića 5, 10000 Zagreb, Croatia

Sustainability, 2021, vol. 13, issue 12, 1-14

Abstract: In this work, alumina (Al 2 O 3 ) ceramics were prepared using an environmentally friendly slip casting method. To this end, highly concentrated (70 wt.%) aqueous suspensions of alumina (Al 2 O 3 ) were prepared with different amounts of the ammonium salt of a polycarboxylic acid, Dolapix CE 64, as an electrosteric dispersant. The stability of highly concentrated Al 2 O 3 aqueous suspensions was monitored by viscosity measurements. Green bodies (ceramics before sintering) were obtained by pouring the stable Al 2 O 3 aqueous suspensions into dry porous plaster molds. The obtained Al 2 O 3 ceramic green bodies were sintered in the electric furnace. Analysis of the effect of three sintering parameters (sintering temperature, heating rate and holding time) on the density of alumina ceramics was performed using the response surface methodology (RSM), based on experimental data obtained according to Box–Behnken experimental design, using the software Design-Expert. From the statistical analysis, linear and nonlinear models with added first-order interaction were developed for prediction and optimization of density-dependent variables: sintering temperature, heating rate and holding time.

Keywords: alumina; slip casting; sintering; Box–Behnken design; response surface method (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
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