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In this work, alumina (Al2O3) ceramics were prepared using an environmentally friendly slip casting method. To this end, highly concentrated (70 wt.%) aqueous suspensions of alumina (Al2O3) 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 Al2O3 aqueous suspensions was monitored by viscosity measurements. Green bodies (ceramics before sintering) were obtained by pouring the stable Al2O3 aqueous suspensions into dry porous plaster molds. The obtained Al2O3 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.
Darko Landek; Lidija Ćurković; Ivana Gabelica; Mihone Kerolli Mustafa; Irena Žmak. Optimization of Sintering Process of Alumina Ceramics Using Response Surface Methodology. Sustainability 2021, 13, 6739 .
AMA StyleDarko Landek, Lidija Ćurković, Ivana Gabelica, Mihone Kerolli Mustafa, Irena Žmak. Optimization of Sintering Process of Alumina Ceramics Using Response Surface Methodology. Sustainability. 2021; 13 (12):6739.
Chicago/Turabian StyleDarko Landek; Lidija Ćurković; Ivana Gabelica; Mihone Kerolli Mustafa; Irena Žmak. 2021. "Optimization of Sintering Process of Alumina Ceramics Using Response Surface Methodology." Sustainability 13, no. 12: 6739.
Darko Landek; Dragutin Lisjak; Thomas Lübben; Josip Župan. Modeling of Dimensional Changes and Residual Stresses After Transformation-Free Cooling. Materials Performance and Characterization 2014, 3, 20140005 .
AMA StyleDarko Landek, Dragutin Lisjak, Thomas Lübben, Josip Župan. Modeling of Dimensional Changes and Residual Stresses After Transformation-Free Cooling. Materials Performance and Characterization. 2014; 3 (4):20140005.
Chicago/Turabian StyleDarko Landek; Dragutin Lisjak; Thomas Lübben; Josip Župan. 2014. "Modeling of Dimensional Changes and Residual Stresses After Transformation-Free Cooling." Materials Performance and Characterization 3, no. 4: 20140005.
The aim of a joint project between the Stiftung Institut für Werkstofftechnik, Bremen (IWT), the company Ipsen International, and the Faculty of Mechanical Engineering and Naval Architecture (FMENA), the University of Zagreb is to develop a computer program for prediction of hardness on the axial section of axially-symmetrical workpieces of any complex shape, thereupon high pressure gas quenching. The hardenability for the specimens made of tool steel grade EN-90MnCrV8 and the cooling dynamics under two gas pressures are measured using the unique facility at IWT. With developed computer simulation model, the cooling curves at different positions (J) along the end-quenched specimen are determined. Based on them, the cooling time from 800 to 500°C (t 8/5) is determined, and the curves J = f(t 8/5) are derived for different quenching conditions. This curves together with curves of hardness distributions along the end-quenched specimens can serve for the prediction of hardness distribution on the cross-sections of a batch of workpieces cooled in vacuum furnace.
Darko Landek; Božidar Liščić; Tomislav Filetin; Thomas Lübben; Dragutin Lisjak. Hardenability Testing and Simulation of Gas-Quenched Steel. Materials and Manufacturing Processes 2009, 24, 868 -872.
AMA StyleDarko Landek, Božidar Liščić, Tomislav Filetin, Thomas Lübben, Dragutin Lisjak. Hardenability Testing and Simulation of Gas-Quenched Steel. Materials and Manufacturing Processes. 2009; 24 (7-8):868-872.
Chicago/Turabian StyleDarko Landek; Božidar Liščić; Tomislav Filetin; Thomas Lübben; Dragutin Lisjak. 2009. "Hardenability Testing and Simulation of Gas-Quenched Steel." Materials and Manufacturing Processes 24, no. 7-8: 868-872.