Enhancing the crystallization phenomena and strength of porcelain stoneware: the role of CaO

Mbakop, Theophile Tchakouteu; Deutou, Juvenal Giogetti Nemaleu; Boubakar, Likiby; Billong, Ndigui; Melo, Uphie Chinje; Kamseu, Elie; Sglavo, Vincenzo M.

doi:10.1007/s10973-020-09323-5

Cited by 11 publications

(8 citation statements)

References 20 publications

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“…With the increase of firing temperature, the water absorption of all samples shows a downward trend. This is because the increase of firing temperature promotes the increase of the content of liquid phase, which can fill the pores of the sample [23]. The trend of volume change with temperature is similar to linear shrinkage, as shown in figure 5(c).…”

Section: Macroscopic Properties Of Stoneware Samplesmentioning

confidence: 63%

“…When the combustion temperature is in the range of 1050 ∼ 1110 °C, a large number of liquid phases is formed in the sample with the increase of temperature. Under the action of capillary force, the liquid phase migrates and fills the gap between crystal particles, cuts off the initially interconnected pores, and begins to form closed circular pores, resulting in the decrease of water absorption [23,24]. Therefore, the water absorption rate decreases significantly with the increase in firing temperature.…”

Section: Macroscopic Properties Of Stoneware Samplesmentioning

confidence: 99%

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New environmentally friendly substance formulation based on steel slag for the manufacture of stoneware

Zhou,

Wang,

et al. 2023

Mater. Res. Express

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In this paper, stoneware was prepared using steel slag shale as the main raw material. A typical ceramic sintering procedure was used to evaluate the effects of a sintering temperature of 1050~1130 °C on the linear shrinkage, water absorption, bulk density, and flexural strength parameters of stoneware samples. The stoneware samples were characterized by XRF, XRD, and SEM. The results showed that the performance of the steel slag content of 40% at sintering temperature of 1110°C was better than the other samples. The main phases of the sample are composed of the quartz phase, the pyroxene phase, and the anorthite phase. Among them, the water absorption rate is 1.36%, the linear shrinkage rate is 11.36%, the bulk density is 2.46 g/cm3, and the flexural strength is 71.13 Mpa. Anorthite and pyroxene improve the bending strength of stoneware samples, which is realized by the prestress mechanism.

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Section: Macroscopic Properties Of Stoneware Samplesmentioning

confidence: 63%

Section: Macroscopic Properties Of Stoneware Samplesmentioning

confidence: 99%

New environmentally friendly substance formulation based on steel slag for the manufacture of stoneware

Zhou,

Wang,

et al. 2023

Mater. Res. Express

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“…The anorthite phase is also formed through the direct reaction between CaO and mullite (3Al 2 O 3 ·2SiO 2 ) according to the following equation 47,48 :

\begin{equation}3{\rm{A}}{{\rm{l}}_{\rm{2}}}{{\rm{O}}_3} \cdot 2{\rm{Si}}{{\rm{O}}_2} + 3{\rm{CaO}} + 4{\rm{Si}}{{\rm{O}}_2} \to 3{\rm{CaA}}{{\rm{l}}_{\rm{2}}}{\rm{S}}{{\rm{i}}_{\rm{2}}}{{\rm{O}}_8}\end{equation}

…”

Section: Resultsmentioning

confidence: 99%

“…The anorthite phase is also formed through the direct reaction between CaO and mullite (3Al 2 O 3 ⋅2SiO 2 ) according to the following equation 47,48 :…”

Section: Influence Of Mullite Additionmentioning

confidence: 99%

Enhanced mechanical properties for porous ceramics with an in situ formation of anorthite crystals during vitrification

Zhang

Liu

Han

et al. 2022

Int J Applied Ceramic Tech

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Porous anorthite ceramics are widely applied as catalysis supports, separation membranes, and thermal insulations at high temperatures. In situ formation of anorthite crystals during vitrification is herein employed to improve mechanical properties of porous anorthite with modulated grain sizes on pore walls. Sintering parameters of shrinkage (5%-30%), open porosity (31.0%-58.3%), density (1.18-1.71 g/cm 3 ), and mass loss (12.20%-18.26%) are estimated to investigate the influences of sintering aids of calcite, fused mullite, and silicon carbide or talcum on the densification processes of porous anorthite. The Kissinger equation is used to determine the activation energy of 783 kJ/mol for the crystallization of anorthite, which is significantly low for the formation of anorthite crystals through surface nucleation mechanism in present flux-rich melt. In situ crystallization and simultaneous densification under liquid drainages are favored for whiskersreinforced mechanism to enhance flexural strengths (6.9-19.4 MPa) for porous anorthite with the porosity of 49.6%-58.3% through the formation of hierarchical nano-and microscale structures during vitrification.

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“…Such restriction is due to the composition of the geopolymer gel or due to the nature of the aluminosilicate used as a solid precursor. Sodium-rich gel favors the crystallization of albite and nepheline, which transforms into a liquid phase at about 900 °C, thus inhibiting its use above 1000 °C [ 7 , 8 , 9 , 10 ]. The K-gel is responsible for the presence of crystalline phases like leucite and kalsilite, stable up to 1400 °C, which account for higher mechanical performance.…”

Section: Introductionmentioning

confidence: 99%

Controlling the Thermal Stability of Kyanite-Based Refractory Geopolymers

2021

Self Cite

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The present project investigated the thermal stability of cold-setting refractory composites under high-temperature cycles. The proposed route dealt with the feasibility of using fillers with different particle sizes and studying their influence on the thermo-mechanical properties of refractory geopolymer composites. The volumetric shrinkage was studied with respect to particle sizes of fillers (80, 200 and 500 µm), treatment temperature (1050–1250 °C) and amount of fillers (70–85 wt.%). The results, combined with thermal analysis, indicated the efficiency of refractory-based kyanite aggregates for enhancing thermo-mechanical properties. At low temperatures, larger amounts of kyanite aggregates promoted mechanical strength development. Flexural strengths of 45, 42 and 40 MPa were obtained for geopolymer samples, respectively, at 1200 °C, made with filler particles sieved at 80, 200 and 500 µm. In addition, a sintering temperature equal to 1200 °C appeared beneficial for the promotion of densification as well as bonding between kyanite aggregates and the matrix, contributing to the reinforcement of the refractory geopolymer composites without any sign of vitrification. From the obtained properties of thermal stability, good densification and high strength, kyanite aggregates are efficient and promising candidates for the production of environmentally friendly, castable refractory composites.

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Enhancing the crystallization phenomena and strength of porcelain stoneware: the role of CaO

Cited by 11 publications

References 20 publications

New environmentally friendly substance formulation based on steel slag for the manufacture of stoneware

New environmentally friendly substance formulation based on steel slag for the manufacture of stoneware

Enhanced mechanical properties for porous ceramics with an in situ formation of anorthite crystals during vitrification

Controlling the Thermal Stability of Kyanite-Based Refractory Geopolymers

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