Processing of mullite–glass ceramics using simplex-centroid design: Densification process dominated by liquid-phase sintering

Alves, Hugo P.A.; Araújo, Allan J.M.; Andrade, Rivaildo M.; Rubens, A.; Ferreira, H. S.; Acchar, Wilson; Campos, L. F. A.; Macedo, Daniel A.

doi:10.1016/j.bsecv.2020.09.002

Cited by 8 publications

(3 citation statements)

References 38 publications

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“…The X‐ray diffraction (XRD) patterns of ceramic sintered mixtures are shown in Figure 11. We notice the disappearance of phases like kaolinite, illite, montmorillonite and the appearance of others like anorthite and mullite as a consequence of a series of physic‐chemical transformations occurred 40,41 . The densification of mixtures proceeded through a viscous sintering (by melt flow) due to the apparition of amorphous phase, which is clearly shown by a diffuse reflection on diffractogram shapes (broad hump between 18 and 40°) 42,43 .…”

Section: Resultsmentioning

confidence: 91%

“…We notice the disappearance of phases like kaolinite, illite, montmorillonite and the appearance of others like anorthite and mullite as a consequence of a series of physic-chemical transformations occurred. 40,41 The densification of mixtures proceeded through a viscous sintering (by melt flow) due to the apparition of amorphous phase, which is clearly shown by a diffuse reflection on diffractogram shapes (broad hump between 18 and 40 • ). 42,43 From the identification of XRD patterns, we notice the apparition of anorthite in all mixture except sample number 3 and 3* composed by 100% kaolin.…”

Section: Mineralogical Analysis By X-ray Diffractionmentioning

confidence: 99%

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Study of clay's mineralogy effect on mechanical properties of ceramic body using an experimental design

Ayadi

Baklouti

Kammoun

et al. 2021

Int J Applied Ceramic Tech

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Three clays minerals namely illite (I), montmorillonite (M), and kaolin (K) were chosen as references to study the effect of mixture composition of clays on the mechanical properties and the shrinkage of the fired ceramic. The study was accomplished using the experimental design methodology. More specifically, a mixture design was carried out in order to establish relationships between mechanical strength and shrinkage of finished products and the proportions of the three clay mineral references in the mixture. The statistical study shows that the fitted models were adequate to describe these properties of fired ceramic bodies. The results demonstrate that the mechanical resistance was mainly governed by the amount of montmorillonite mineral. In fact, the mixture design performed in this study shows clearly that montmorillonite can be incorporated in industrial ceramic products up to 45 wt% with high mechanical resistance. On the other hand, the shrinkage decreases strongly with the amount of kaolin in the mixture and increases with the amount of illite while montmorillonite exhibits moderate effect on this property. The higher strength was shown in mixture in which mullite and anorthite appear together due to the presence of kaolinite and illite and give, as a consequence, a synergic power.

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Section: Resultsmentioning

confidence: 91%

Section: Mineralogical Analysis By X-ray Diffractionmentioning

confidence: 99%

Study of clay's mineralogy effect on mechanical properties of ceramic body using an experimental design

Ayadi

Baklouti

Kammoun

et al. 2021

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

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“…Sufficient densification occurred at ∼950 • C due to the melting of LaBO 3 phase. 18 Alves et al found that an LPS mechanism favored the densification process of mullite glass-ceramics, 19 but they did not examine the effects of residual liquid phase on the microstructures and properties of the glass-ceramics after sintering. Despite a few works have been conducted on LPS of glass-ceramics, our understanding of glass-ceramics prepared by LPS is still very limited.…”

Section: Introductionmentioning

confidence: 99%

Liquid‐phase sintering of ZrO₂‐based nanocrystalline glass–ceramics achieved by multielement co‐doping

Wang

Deng

et al. 2022

J Am Ceram Soc.

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Liquid‐phase sintering (LPS) is an effective pathway to assist the densification of ceramics. However, it has seldom been used to densify glass–ceramics. In the present study, a multielement co‐doping strategy has been utilized to achieve LPS of a ZrO2–SiO2 nanocrystalline glass–ceramic. Compared with undoped samples densified by solid‐state sintering, doping of equimolar Al, Y, and Ca promoted the densification of the glass–ceramic at lower temperatures with a faster densification rate. Ternary doping enhanced coarsening of ZrO2 nanocrystallites during sintering and annealing. The distribution of dopants was carefully observed with X‐ray energy‐dispersive spectrometry technique in scanning electron transmission microscopy mode. Results showed that the three dopants showed different distribution behaviors. After sintering, Y dopants were predominately distributed in ZrO2 nanocrystallites, whereas parts of Al and Ca dopants were distributed in ZrO2 nanocrystallites and part of them co‐segregated at the ZrO2/SiO2 heterointerfaces. Meanwhile, the segregation of Ca dopant at some intergranular films among ZrO2 nanocrystallites was observed. Redistribution of dopants did not occur during annealing.

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Application of augmented simplex‐centroïd mixture design in developing and optimizing new low‐cost microfiltration membranes from clays and cassava peels for bacteria removal

Mountapbeme,

Mbamyah,

Pountouenchi

et al. 2024

Int J Ceramic Engine & Sci

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The sharp increase in waterborne diseases due to bacterial contamination is limiting the supply of safe water in developing countries. This study focuses on the development and optimization of a low‐cost ceramic membrane based on natural resources and local waste for eliminating bacteria from water. The augmented simplex centroïd mixture design (ASCD) was used. The obtained optimal formulation consisted of 65% Ebebda clay (EB) 18.64% Koutaba clay (KG), and 16.34% cassava peel (PM) with a holding temperature of 1 100°C. The raw materials and membrane were characterized by chemical analysis using X‐ray florescence, X‐ray diffractometry, Thermal Gravimetric/Differential Scanning Calorimetry (TG/DSC), FTIR, scanning electron microscopy, SBET, porosity and flexural strength. The optimal membrane has 43.26% of porosity, 7.46 MPa of strength, 0.55 m2/g of specific surface area, an average pore diameter of 1.31 µm and a water permeability of 4 345,87 L h−1 m−2 bar−1. The ability of the membrane support to retain Pseudomonas aeruginosa, Klebsiella pneumoniae, Salmonella sp and Staphylococcus aureus bacteria present in contaminated water was finally assessed. Retention tests showed 100% of P. aeruginosa, 97.37% of K. pneumoniae, 93.69% of Salmonella sp, and 90% of S. aureus, making this new, less expensive ceramic membrane a potential candidate for the water treatment.

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Processing of mullite–glass ceramics using simplex-centroid design: Densification process dominated by liquid-phase sintering

Cited by 8 publications

References 38 publications

Study of clay's mineralogy effect on mechanical properties of ceramic body using an experimental design

Study of clay's mineralogy effect on mechanical properties of ceramic body using an experimental design

Liquid‐phase sintering of ZrO₂‐based nanocrystalline glass–ceramics achieved by multielement co‐doping

Application of augmented simplex‐centroïd mixture design in developing and optimizing new low‐cost microfiltration membranes from clays and cassava peels for bacteria removal

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Processing of mullite–glass ceramics using simplex-centroid design: Densification process dominated by liquid-phase sintering

Cited by 8 publications

References 38 publications

Study of clay's mineralogy effect on mechanical properties of ceramic body using an experimental design

Study of clay's mineralogy effect on mechanical properties of ceramic body using an experimental design

Liquid‐phase sintering of ZrO2‐based nanocrystalline glass–ceramics achieved by multielement co‐doping

Application of augmented simplex‐centroïd mixture design in developing and optimizing new low‐cost microfiltration membranes from clays and cassava peels for bacteria removal

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Liquid‐phase sintering of ZrO₂‐based nanocrystalline glass–ceramics achieved by multielement co‐doping