Ceramic compositions based on nano forsterite/nano magnesium aluminate spinel powders

Khattab, R.M.; Wahsh, M.M.S.; Khalil, N.M.

doi:10.1016/j.matchemphys.2015.09.030

Cited by 16 publications

(1 citation statement)

References 39 publications

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“…To reach fully dense forsterite, some new sintering techniques like two step sintering and spark plasma sintering (SPS) also were tried and the improvement in sinterability to relative density of 98.5-99% and hardness values up to 10.8 GPa with indentation fracture toughness of ∼4 MPa m 1/2 attained [7][8][9]. Another alternative to overcome with these limitations of forsterite was through addition of second phase and the most preferred one that can be sintered in an oxidizing atmosphere and withstand high mechanical strength at elevated temperatures, high chemical inertness, and good thermal shock resistance was magnesium aluminate spinel (MgAl 2 O 4 ) [10][11][12][13]. Previous studies confirmed the positive effects of spinel phase on the mechanical properties of forsterite ceramic.…”

Section: Introductionmentioning

confidence: 99%

Mg2SiO4-MgAl2O4 directionally solidified eutectics: Hardness dependence modelled through an array of screw dislocations

Moshtaghioun

Gómez-Garcı́a

Peña

2020

Journal of the European Ceramic Society

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Mg 2 SiO 4 -MgAl 2 O 4 eutectic ceramics have been fabricated by means of the laser floating zone (LFZ) technique. The microstructure has revealed as an unusual one at lower growth rate, composed of broken lamellae of MgAl 2 O 4 distributed randomly along one matrix, composed of Mg 2 SiO 4 . At higher growth rates, a cell structure with intra-cell lamella structure is dominant. Contrary to most eutectic systems, hardness is not dependent upon the inter-spacing, but it does depend on one characteristic length of lamellae: their perimeter. One simple model based upon the dislocation is proposed, which successfully accounts for such extraordinary hardness law. Accordingly, Mg 2 SiO 4 -MgAl 2 O 4 eutectic ceramics fabricated at 50 mm/h growth rate with the smallest MgAl 2 O 4 lamella perimeter favorably showed more elevated hardness (13.4 GPa from Vickers indentation and 15.3 GPa from nanoindentation) and strength (∼430 MPa) than those found in the monolithic Mg 2 SiO 4 matrix.

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Section: Introductionmentioning

confidence: 99%

Mg2SiO4-MgAl2O4 directionally solidified eutectics: Hardness dependence modelled through an array of screw dislocations

Moshtaghioun

Gómez-Garcı́a

Peña

2020

Journal of the European Ceramic Society

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Comparative study on structure, dielectric and electrical properties of cobalt- and zinc-substituted Mn3O4 spinels

Acharya

Sagar

2020

Appl. Phys. A

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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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Ceramic compositions based on nano forsterite/nano magnesium aluminate spinel powders

Cited by 16 publications

References 39 publications

Mg2SiO4-MgAl2O4 directionally solidified eutectics: Hardness dependence modelled through an array of screw dislocations

Mg2SiO4-MgAl2O4 directionally solidified eutectics: Hardness dependence modelled through an array of screw dislocations

Comparative study on structure, dielectric and electrical properties of cobalt- and zinc-substituted Mn3O4 spinels

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

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