Porous alumina-felsite ceramic composites prepared by direct coagulation casting method: Felsite rock (central-eastern desert, Egypt)

Khattab, R.M.; Hessien, Manal; Ghaffar, N.I. Abd El; Rahim, Said H. Abd El; Sadek, H.E.H.

doi:10.1016/j.ceramint.2020.07.334

Cited by 5 publications

(2 citation statements)

References 21 publications

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“…[20][21][22][23][24][25] Generally, microporous aggregates can be obtained by crushing and screening porous ceramics. [26][27][28][29][30][31][32] At present, porous MgO-Al 2 O 3 ceramics can be produced not only by the template method, 33 but also by direct foam gelcasting, 34 in situ decomposition synthesis. [35][36][37] For example, Hashimoto et al 28 prepared porous spinel with a porosity of 61% and compressive strength of 13 MPa using a corn starch of 10-μm size as a pore forming agent and porous alumina as the template, but the resulting costs were too high.…”

Section: Introductionmentioning

confidence: 99%

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Microstructures and strengths of microporous MgO–Al₂O₃ ceramics from Al(OH)₃ and calcined magnesite

Chen

Yan

et al. 2022

J Am Ceram Soc.

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Seven microporous MgO-Al 2 O 3 ceramics with an Al 2 O 3 content of 15-90 wt% were prepared using Al(OH) 3 and calcined magnesite as raw materials. A wet mixing process was employed during sample preparation to transform the calcined magnesite with a larger particle size to smaller Mg(OH) 2 particles. The in situ decomposition synthesis method and the Kirkendall effect were utilized to produce and control the pore structure of the microporous MgO-Al 2 O 3 ceramics. There were two kinds of pores in the microporous MgO-Al 2 O 3 ceramics. The first one resulted from the in situ decomposition of Al(OH) 3 and Mg(OH) 2 particles, which were small and equally distributed. Another one originated from the position of the Mg(OH) 2 particles due to the Kirkendall effect caused by MgO diffusion. They were similar in size to the Mg(OH) 2 pseudomorph particles. Simultaneously, the Al 2 O 3 content affected the packing behavior and the spinel formation, which changed the characteristics of the pores and necks among the particles. These mechanisms also affected the strengths of the microporous MgO-Al 2 O 3 ceramics. Thus, when the Al 2 O 3 content was 45-90 wt%, the microporous MgO-Al 2 O 3 ceramics had a high compressive strength (10.0-18.3 MPa) and apparent porosity (52.2%-58.4%).

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Section: Introductionmentioning

confidence: 99%

“…Generally, microporous aggregates can be obtained by crushing and screening porous ceramics 26–32 . At present, porous MgO–Al 2 O 3 ceramics can be produced not only by the template method, 33 but also by direct foam gelcasting, 34 in situ decomposition synthesis 35–37 .…”

Section: Introductionmentioning

confidence: 99%

Microstructures and strengths of microporous MgO–Al₂O₃ ceramics from Al(OH)₃ and calcined magnesite

Chen

Yan

et al. 2022

J Am Ceram Soc.

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The Role of TiO2 on ZnAl2O4 Spinel Prepared by Direct Coagulation Casting Method: Physico-mechanical, Optical, Structural and Antimicrobial Properties

Sadek,

Reda,

Khattab

et al. 2023

J Inorg Organomet Polym

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This work represents the shaping of alumina–zinc oxide (AZ) samples with the direct coagulation casting method. The effect of zinc oxide (0, 10, 20, 30, and 40 wt%) and the firing temperatures on the phase composition, microstructure, physical properties, and mechanical properties of the AZ samples were studied. The effect of titanium oxide (2, 5, and 7 wt%) and the firing temperatures on the phase composition, microstructure, physical properties, and mechanical properties of the AZ sample with 40 wt% of zinc oxide were studied. Furthermore, the optical properties, magnetic properties, and antimicrobial activity were measured. The results indicate that the increase in zinc oxide enhances the formation of zinc aluminate, which has a gahnite phase. Moreover, increasing the zinc oxide increases the apparent porosity and decreases the grain size and bulk density at various firing temperatures. On the other hand, the addition of 5 wt% titanium oxide increases the bulk density to 3.5 g/cm3 compared to 1.72 g/cm3 with no titania. The apparent porosity and compressive strength reached 5% and 69.2 MPa after 5 wt% TiO2 addition; respectively, compared to 59% and 27.2 MPa with no titania addition. The prepared samples show promising optical band gap of 2.98–3.97 eV, a mixed magnetic behavior, and favorable antibacterial activity against E. coli, S. aureus, B. cereus strains.

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Utilization of granite sludge for production of cordierite ceramics by direct coagulation casting

Sadek

Zawrah

Gaber

et al. 2021

Ceramics International

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Porous alumina-felsite ceramic composites prepared by direct coagulation casting method: Felsite rock (central-eastern desert, Egypt)

Cited by 5 publications

References 21 publications

Microstructures and strengths of microporous MgO–Al₂O₃ ceramics from Al(OH)₃ and calcined magnesite

Microstructures and strengths of microporous MgO–Al₂O₃ ceramics from Al(OH)₃ and calcined magnesite

The Role of TiO2 on ZnAl2O4 Spinel Prepared by Direct Coagulation Casting Method: Physico-mechanical, Optical, Structural and Antimicrobial Properties

Utilization of granite sludge for production of cordierite ceramics by direct coagulation casting

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Porous alumina-felsite ceramic composites prepared by direct coagulation casting method: Felsite rock (central-eastern desert, Egypt)

Cited by 5 publications

References 21 publications

Microstructures and strengths of microporous MgO–Al2O3 ceramics from Al(OH)3 and calcined magnesite

Microstructures and strengths of microporous MgO–Al2O3 ceramics from Al(OH)3 and calcined magnesite

The Role of TiO2 on ZnAl2O4 Spinel Prepared by Direct Coagulation Casting Method: Physico-mechanical, Optical, Structural and Antimicrobial Properties

Utilization of granite sludge for production of cordierite ceramics by direct coagulation casting

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Microstructures and strengths of microporous MgO–Al₂O₃ ceramics from Al(OH)₃ and calcined magnesite

Microstructures and strengths of microporous MgO–Al₂O₃ ceramics from Al(OH)₃ and calcined magnesite