A novel technique of gel-casting for producing dense ceramics of spinel (MgAl2O4)

Shahbazi, Hossein; Tataei, M.

doi:10.1016/j.ceramint.2019.01.196

Cited by 16 publications

(5 citation statements)

References 17 publications

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“…Several methods have been employed to fabricate porous ceramics, including the direct consolidation method [9], fused deposition [10], freeze casting [11], gelcasting [12], foam gelcasting [13], and sol-gel [14]. Among these methods, gelcasting is a simple low-cost method because the fabrication process does not require high temperatures and pressures [15].…”

Section: ■ Introductionmentioning

confidence: 99%

Effect of Sintering Temperature on the Microstructure Behavior of Gelcasted Porous Ceramics Using Cassava Starch as Pore Template

Putri,

Pratiwi,

Tjahjanto

et al. 2023

Indones. J. Chem.

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The gelcasting technique was employed to fabricate porous ceramics utilizing kaolinite clay as the base material with a combination of 20 wt.% cassava starch. The utilization of cassava starch as a pore-template material is a sustainable and eco-friendly approach. The dry mixture compacted pellets underwent calcination for 2 h at three distinct sintering temperatures, namely 900, 1000, and 1100 °C. The present study investigated the impact of sintering temperatures on various ceramic properties, including but not limited to porosity, hardness, crystallinity, lattice strain, and morphology. Furthermore, an increase in sintering temperature led to a reduction in crystallinity of the ceramic material from 81.71 to 78.06%, while the lattice strain increased, as determined by the full width at half maximum peak diffraction calculation. The study determined that the pore size remained microporous (21 Å) across all temperature treatments. Ultimately, a porous ceramic material was fabricated, exhibiting a porosity of 39.44% by volume and a desirable hardness of 94 HB. The optimal sintering temperature for this material was found to be 900 °C. The anticipated application of the porous ceramic, which has taken on a pellet shape, is as a catalyst support for wastewater filtration in the future.

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Section: ■ Introductionmentioning

confidence: 99%

Effect of Sintering Temperature on the Microstructure Behavior of Gelcasted Porous Ceramics Using Cassava Starch as Pore Template

Putri,

Pratiwi,

Tjahjanto

et al. 2023

Indones. J. Chem.

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“…Thermal stability of ceramic materials based on zirconium and/or aluminum oxides makes it possible to use them as functional ceramics and thermal barrier coatings at high temperatures [1][2][3][4][5]. However, under the action of high temperatures, especially during abrupt heating or cooling, internal stresses appear in the material -usually compression stresses, tensile stresses of cut, and more rarely bending stresses.…”

Section: Introductionmentioning

confidence: 99%

Dilatometric characteristics of weakly sintered ceramics

et al. 2022

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Thermal expansion of refractory ceramics CaZrO3, MgAl2O4, La2Zr2O7 and YSZ-12 was studied. The samples of the complex oxides were synthesized by solution combustion synthesis with glycine; the fuel:oxidant ratio was varied depending on the character of redox reaction. The linear thermal expansion coefficient (LTEC) of ceramics was measured on the samples with an initial density 23–52%. The maximal sinterability of 89–92% after 6 h annealing at 1550 °С was demonstrated by La2Zr2O7 and YSZ-12, and the minimal values (78–82%) – by CaZrO3 and MgAl2O4. All materials have close LTEC values, from 9.0 to 9.6·10–6 K–1.

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“…The initial focus of the research was to manipulate the properties of spinel single crystals [27]. After the advent of nanotechnology, different morphological forms, for example, nanoplates [28], nanotubes composites [29] and nanopowders were also studied [30,31]. The optical properties were mostly enhanced using rare earth cations, for example, Eu 3+ [32], Tb 3+ [33], and Dy 3+ [34].…”

Section: Introductionmentioning

confidence: 99%

Doped MgAl₂O₄ semiconductor host nanopowders for tunable primary color emissions for application as white LEDs

Ain¹,

Ismail²,

Khan³

et al. 2021

Semicond. Sci. Technol.

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The emission of white light from hosts having a single phase and the compromised applicability of a very inert, chemically stable, and structurally diverse MgAl2O4 led to a quest for improving the structural, optical, thermal and electrical properties for more innovative applications. A slight modification in lattice site occupation can lead to antisite defects which alter the physical properties of the materials. The presence of larger alkaline earth Sr2+ cations at the T-sites have been found to improve the behavior of the activator Mn2+ cations which are substituted for Mg2+ at T-sites. In the current study, a series of Mn2+ doped derivatives having a general formula of Mg1−x−0.3Mn x Sr0.3Al2O4 (x = 0.1–0.5) were synthesized using the chemical co-precipitation method. Due to the larger radius of Sr2+ cations, the lattice strain was observed in the cubic crystal structure of magnesium aluminate spinel (MAS). A decrease in the bandgaps of the doped samples indicates the formation of defect states within the bandgap of MAS. Apart from the bandgap transitions, the capture of electrons at oxygen vacancies is also observed in the UV/Vis spectra. The strong tetrahedral site preference of Mn2+ is altered by the presence of Sr2+, hence, some octahedral site occupation of Mn2+ in the lattice is achieved. The antisite defects along with the occupation of both T- and O-sites by Mn2+ resulted in novel emission bands centered at 464 nm (blue), 515 nm (green), and 621 nm (red) at λ ex of 380 nm. The emission of the primary colors in a simple lattice with cost-effective and in-toxic constituents can be a possible alternative to the costly rare-earth ions doped complex materials in use to-date.

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A novel technique of gel-casting for producing dense ceramics of spinel (MgAl2O4)

Cited by 16 publications

References 17 publications

Effect of Sintering Temperature on the Microstructure Behavior of Gelcasted Porous Ceramics Using Cassava Starch as Pore Template

Effect of Sintering Temperature on the Microstructure Behavior of Gelcasted Porous Ceramics Using Cassava Starch as Pore Template

Dilatometric characteristics of weakly sintered ceramics

Doped MgAl₂O₄ semiconductor host nanopowders for tunable primary color emissions for application as white LEDs

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A novel technique of gel-casting for producing dense ceramics of spinel (MgAl2O4)

Cited by 16 publications

References 17 publications

Effect of Sintering Temperature on the Microstructure Behavior of Gelcasted Porous Ceramics Using Cassava Starch as Pore Template

Effect of Sintering Temperature on the Microstructure Behavior of Gelcasted Porous Ceramics Using Cassava Starch as Pore Template

Dilatometric characteristics of weakly sintered ceramics

Doped MgAl2O4 semiconductor host nanopowders for tunable primary color emissions for application as white LEDs

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Doped MgAl₂O₄ semiconductor host nanopowders for tunable primary color emissions for application as white LEDs