Optimization of Sintering Process of Alumina Ceramics Using Response Surface Methodology

Landek, Darko; Ćurković, Lidija; Gabelica, Ivana; Mustafa, Mihone Kerolli; Žmak, Irena

doi:10.3390/su13126739

Cited by 12 publications

(11 citation statements)

References 29 publications

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“…The F -test and the associated p -values ( p < 0.05) were determined for the developed model [ 36 , 37 ]. The F -value of 20.45 and the appropriate p = 0.001 suggest that the reduced quadratic model of the density response is a significant model.…”

Section: Resultsmentioning

confidence: 99%

Effect of Two-Step Sintering on Properties of Alumina Ceramics Containing Waste Alumina Powder

et al. 2022

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This study aims to evaluate the recycling potential of solid waste alumina powder (WAP) by utilization of the two-step sintering (TSS) process. For the study, WAP was collected as an industrial scrap after the machining process for the formation of green alumina compacts. The alumina samples were prepared according to the slip casting method by preparing suspensions containing commercial alumina with 0.8 μm average particle size and by adding up to 20 dwb. % (i.e., expressed on a dry weight basis) of WAP with 3.4 μm average particle size. The samples were sintered at optimized TSS conditions and compared with conventional one-step sintering (OSS) by conducting morphological analyses. The average grain size (AGS) was determined from the obtained field emission scanning electron microscopy (FESEM) images, while the sample porosity was calculated based on apparent densities. The obtained micrographs after TSS implementation revealed a partially textured microstructure. Furthermore, a comparison of the mechanical properties of alumina samples lacking or containing 20 dwb. % of WAP obtained after sintering is presented. The indentation fracture toughness (~3.2 MPa m1/2) and Vickers hardness data (~14.5 GPa) showed a positive effect of adding WAP to alumina samples. The slightly improved mechanical properties of ceramic samples containing waste alumina are a consequence of lower porosity, which is due to the remaining sintering additives in WAP. The collected results demonstrate the possibility of using TSS for sintering ceramic materials that contain WAP.

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Section: Resultsmentioning

confidence: 99%

Effect of Two-Step Sintering on Properties of Alumina Ceramics Containing Waste Alumina Powder

et al. 2022

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“…Alumina, also known as aluminium oxide (Al 2 O 3 ), is a highly significant ceramic material with a wide range of technological applications [1][2][3][4]. It is considered as one of the most commonly utilised advanced ceramics due to its exceptional properties, such as high hardness, chemical inertness, wear resistance and a high melting point.…”

Section: Introductionmentioning

confidence: 99%

“…The second group is the ratio of the target brittleness and the size of the erodent particle. Also, the ratio (K IC / HV) 2 shows the relative resistance of the target to fracture during an erodent impact. The third group is a ratio of kinetic energy per erodent particle, to the target hardness [21].…”

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confidence: 99%

The volume erosion rate of the slip cast monolithic and composite ceramics

Ćurković

Landek

Švagelj

et al. 2023

Advances in Applied Ceramics: Structural, Functional and Biocer

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The volume erosion rate of the slip cast monolithic and composite ceramics was studied using SiO 2 and SiC particles as erodents, under different impact angles (30°, 60°, 90°), at room temperature. Therefore, three groups of samples were prepared: (i) monolithic alumina (Al 2 O 3 ); (ii) composite alumina-zirconia (Al 2 O 3 -ZrO 2 ) containing 99 wt-% Al 2 O 3 and 1 wt-% ZrO 2 and (iii) composite alumina-zirconia (Al 2 O 3 -ZrO 2 ) containing 90 wt-% Al 2 O 3 and 10 wt-% ZrO 2 . Erosion mechanisms of all prepared ceramic samples were evaluated by the volume erosion rate (v, mm 3 •g -1 ). Obtained results were compared with the analytical Wiederhorn and Evans equations. The mechanical properties (hardness and fracture toughness) of prepared ceramic samples were compared with their v under the above-mentioned conditions. It was found that the erosion of monolithic and composite ceramics increased with the increase of the impact angle. Volume erosion rate was highest at an impact angle of 90°and amounts to 115 mm 3 •g -1 with SiC, and 12 mm 3 •g -1 with SiO 2 erodent particles for monolithic alumina ceramics, 77 mm 3 •g -1 with SiC, and 8 mm 3 •g -1 with SiO 2 erodent particles for ceramics with the addition of 1 wt-% of ZrO 2 , and 61 mm 3 •g -1 with SiC, and 7 mm 3 •g -1 with SiO 2 erodent particles for ceramics with the addition of 10 wt-% of ZrO 2 . Therefore, it can be concluded that the erosion resistance of monolithic Al 2 O 3 increases with the increasing amount of ZrO 2 in the composite Al 2 O 3 -ZrO 2 ceramics, thus erosion resistance can be improved with the addition of ZrO 2 .

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“…However, the raw materials prepared are expensive and their economic feasibility is less useful. Another drawback is that the formation of such ceramics requires very high temperatures of about 1600 o C [6]. Several attempts have been made to reduce production costs and to lower the firing temperature of the ceramic membrane.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Ceramic Membrane based on Calcium Carbonate from Onyx Stone and Its Application for Coconut Sap Treatment

Aripin

Priatna

Dedi

et al. 2022

IJE

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In this study, the calcium carbonate from onyx stone used as a pore-forming agent in the ceramic membrane of kaolin, zeolite, and silica xerogel composites were investigated. Four different membrane samples were prepared with varying onyx stone content from 5 wt.% to 30 wt.% into composite and then the prepared samples were sintered at 1200 o C. T he structural properties of the prepared sample was investigated in detail using X-ray diffraction (XRD), Fourier transform infrared (FT IR) spectroscopy, Scanning Electron Microscopy (SEM), and N2 adsorption-desorption isotherms. T he removal performance of the membrane was successfully tested during coconut sap treatment. It has been found that the prepared samples have a porous structure made up of interconnected pores and their volume fraction depends on onyx stone content. The sample with the onyx stone content of 30 wt.% provides the largest volume fraction of homogeneously interconnected pores and its presence demontrates the largest value for sap permeate flux and the flux rate in the initial phase. T he pores formed in this produced membrane provide favorable conditions for the removal of the non -sugar impurities in the coconut sap.

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Optimization of Sintering Process of Alumina Ceramics Using Response Surface Methodology

Cited by 12 publications

References 29 publications

Effect of Two-Step Sintering on Properties of Alumina Ceramics Containing Waste Alumina Powder

Effect of Two-Step Sintering on Properties of Alumina Ceramics Containing Waste Alumina Powder

The volume erosion rate of the slip cast monolithic and composite ceramics

Characterization of Ceramic Membrane based on Calcium Carbonate from Onyx Stone and Its Application for Coconut Sap Treatment

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